Abstract:With mPEG as hydrophilic segment, epoxy resin as hydrophobic segment and isoflurone diisocyanate as the linker, the amphiphilic macromolecule WEG which contains the epoxy group was prepared. The amphiphilic macromolecule WEG is able to co-assemble with fluorescer and epoxy resin E51 in a selective solvent (water) to form a water-based emulsion. The emulsion mixed with modified amine curing agent in a certain proportion and followed by crosslinking at room temperature can build shape memory polymer materials with photoluminescence (fluorescence) function. The structures and properties of WEG, emulsion and film were characterized by FTIR, NMR, GPC, nanometer particle size analyzer, fluorescence spectrometer and DSC. The results showed that the emulsion has good particle size stability. The shape memory polymer film has good photoluminescence function and can be restored to the original shape rapidly upon heating, and the shape recovery degree can go up to 94.3%.

Abstract:The submicro-hollow microsphere polymer were prepared by emulsion polymerization and alkali swelling. The morphology and particle size of the hollow microspheres were characterized by SEM, TEM and DLS. And the covering performance of hollow microsphere polymer emulsion was tested. The effects of the initiator amount on the particle size of the core, the interlayer and shell component on the morphology of the hollow microsphere polymer were investigated. The results showed that the core particle size decreased with the increasing initiator amount. For the core with an average particle size of 148 nm, surface-smooth hollow microsphere polymer with an average particle size of 414 nm and a hollow rate of 40.6 % was prepared with the amount of BMA, MAA and MMA in interlayer was 10 wt%, 3 wt% and 87 wt% respectively, and the amount of St, crosslink agent in shell was 97 wt% and 3 wt% respectively. The as-synthesized hollow microsphere polymer exhibited excellent covering performance of 66 %.

Abstract:2,5-dibromoterephthalic acid is firstly converted into acryl chloride intermediates by acylation reaction, and further reacts with 4-amino-2,2,6,6-tetramethylpiperidineoxyl (4-NH2-TEMPO) resulting in di-TEMPO function-alized organic building blocks. Sonogashira coupling reaction between the di-TEMPO monomer and tetrakis(4-ethynylphenyl)methane leads to the formation of high density TEMPO radical functionalized conjugated microporous polymers (CMPs), named CMP-4-(TEMPO)2. The chemical composition and structural information of the corresponding monomer and polymers are characterized by NMR, SEM, PXRD, and EPR spectra. CMP-4-(TEMPO)2 consists microspheres and nanotubes, and possesses high BET surface areas (486 m2/g) with micro-, meso- and macropores. The high density of TEMPO radicals in CMP-4-(TEMPO)2 enable highly efficient oxidation of a broad range of alcohols, including aromatic al-cohols, heteroatomic alcohols and fatty alcohols, into their aldehydes and ketones with excellent selectiv-ity.

Abstract:DCB diazonium salt aqueous solutions were synthesized from slightly soluble 3,3’-dichlorobenzidine hydrochloride by continuous-flow method via a collision mixer. The concentration of DCB diazonium salt was evaluated by spectrophotometry and the yield of diazotization was calculated. In order to optimize the conditions of diazotization reaction, the effects of DCB concentrations,feed temperature, flow rate, molar ratio of HCl and DCB on the yield of diazotization were investigated and a yield of 98.3% was achieved under the optimized reaction conditions of mass concentration of DCB 70g/L, feed temperature 20℃, flow rate 1.1m/s, n(HCl)∶n(DCB)=4. The continuous process,in comparison with the batch process, requires less acid, improves the reaction efficiency, and can be carried out at room temperature(20℃),which significantly reduces energy consumption and has great potential in industrial applications.

Abstract:Bound aroma compounds from Litsea mollis Hemsl. were separated by Amberlite XAD-2 column chromatography and analyzed by gas chromatography-mass spectrometry (GC-MS) at three different conditions. The purpose of this study is to definite the effects of different hydrolytic conditions on the bonding aroma compounds. The result shows that 90 bound aroma compounds were identified in three different hydrolysates totally, mainly including Oxygenated monoterpenes and terpenes. Geraniol was the most abundant compound under two enzymatic hydrolysis conditions. And the highest content was 21798.79μg/L under the condition of pectinase hydrolysis; A total of 34 aroma substances have obvious aroma characteristics. And the most significant aroma features are floral and sweet under the two enzymatic hydrolysis, and floral under the hydrolysis of acid. Significant differences were found in the composition of bound aroma compounds among the different hydrolysates. In contrast, the most kinds and high content of aroma compounds were detected under the condition of pectinase hydrolysis, which was more conducive to the release of the bonding aroma components of Litsea mollis Hemsl..

Abstract:N-lauroyl sarcosine triethanolamine reactant is a surfactant with excellent performance and good biodegradability. It is widely used in daily chemical, metal processing and hydraulic transmission media industries. The effects of reaction temperature and time on the structure of N-lauroyl sarcosine triethanolamine reactant were studied. The structure was confirmed by infrared spectroscopy and nuclear magnetic resonance. The results show that the anionic surfactant (product A) is more easily obtained at low temperature (75℃), and the nonionic surfactant (product B) is more easily obtained under high temperature (130℃). At the same time, the foam properties and hard water resistance of the two products were compared. It was found that when the mass concentration is less than 0.8%, the surface tension of the product A is smaller than the surface tension of the product B. When the mass concentration is 0.3%, the surface tension is the smallest, and the foam half-lives of product A and product B are 22.56 min and 28.26 min, respectively. When the mass concentration is 1.0%, the product B has an improved hard water resistance of 23.57% compared with the product A, which is more favorable for emulsion stability. Through the research to provide a reference for the theoretical research and practical application of N-lauroyl sarcosine triethanolamine.

Abstract:Abstract: The preparation of sitagliptin related substances by the aza-Michael addition reaction of dime-thyl-maleate or maleic acid to sitagliptin is crucial to assist in research of the risk control of sitagliptin drug impurities：①Using sitagliptin and dimethyl fumarate as raw materials, 1,8-Diazabicyclo（5.4.0）undec-7-ene (DBU) as a catalyst, stirring at 25?C for 6 hours under N2 protection, separation and purifi-cation by Ethyl Acetate - HCl - H2O crystallization system, 76 % yield of the sitagliptin impurity I, 99% purity by HPLC; ②Maleic acid as raw material, stirring at room temperature for 2 hours with K2CO3, to prepare sitagliptin impurity II by one-step method, up to 98% yield. The two kinds of sitagliptin impurities have been synthesized with good yield and high purity, and has the advantages of short route, low energy consumption, low production cost and simple operation for industrial production.

Abstract:Liquid-liquid microextraction (LLME) combined with gas chromatography/mass spectrometry (GC-MS) was used to analyze the base distillates produced by five different layers of Jiupei in the same cellar of Gujinggongjiu ,and selected 25 kinds of reported biologically active compounds for quantification. The spiked recovery of the compounds were between 82.22% and 105.83%, and the order of total contents in the 5 base distillates was A> C> E> B> D. Principal component analysis was used to analyze the quantitative results of 25 kinds of biologically active compounds. The results showed that: A produced by the uppermost Jiupei differed greatly from the rest of the samples, and was distinguished on the second principal component; B, C, D, E had certain similarities on the second principal component and showed differences on the first principal component. This study was helpful for understanding the differences in bioactive substances among different base distillates.

Abstract:Malignant tumor is one of the disease with the highest mortality rate worldwide. In clinic, the common treatment methods include chemotherapy, radiotherapy and surgery, and majority of patient after surgical treatment also need adjuvant chemotherapy. In order to achieve targeted delivery and quickly release of the drug at the tumor site, stimuli-responsive smart nanocarrier system has received extensive attention. The smart nanocarrier system mainly include tumor?microenvironment stimuli-responsive?smart?nanocarrier system and external physical stimuli-responsive?smart?nanocarrier system. Smart nanocarrier system can transport antitumor drug in circulation stably. After arriving the tumor site, the drug can quickly release from the smart nanocarrier system after triggered by the tumor microenvironment or external physical stimuli, which could improve the drug concentration of the lesion,significantly?increase?the?antitumor?efficiency?and?reduce?the?side?effects?of?drugs.This?review?mainly?gives?a?comprehensive?overview?in?the?latest?research?and?new?development?of smart nanocarrier system, targeted smart nanocarrier system and multifunctional smart nanocarrier system. Moreover, the existingproblems are pointed out along with their possible future applications in this review.

Abstract:Abstract: To improve the synthetic process of glycosylation, 2, 3, 4, 6-tetra-O-acetyl-α-D-glucopyranosyl bromide (Ⅱ) was firstly synthesized from D-glucose. Then, a glycosylation reaction between compounds Ⅱ and maltol (I) led to maltol-2, 3, 4, 6-tetra-O-acetyl-β-D-glucoside (Ⅲ) by phase transfer catalysis method and Koenigs-Knorr method, respectively. Finally, the target compound maltol-β-D-glucoside (Ⅳ) was obtained by hydrolysis of compound Ⅲ. These compounds were confirmed by 1HNMR, 13CNMR, IR and HRMS. The effects of pyrolysis and aroma evaluation of target glycoside Ⅳ were studied. The results indicated that the compound Ⅲ synthesized by the two above-mentioned methods was target product, the phase transfer catalysis method was better than Koenigs-Knorr method. The optimal conditions for the preparation of compound Ⅲ by phase transfer catalysis method were as follows: acetone was used as the solvent, anhydrous potassium carbonate was used as acid binding agent, and tetrabutyl ammonium bromide (TBAB) was used as phase transfer catalyst, n (maltol): n (2, 3, 4, 6-tetra-O-acetyl-α-D-glucopyranosyl bromide)=1:1.2, reaction at room temperature for 4 h. Under these optimal conditions, the yield of compound Ⅲ reached 75.6%. Hydrolysis of compound III to compound IV in sodium methoxide/methanol system. The target glycoside Ⅳ can release characteristic flavor components such as maltol by pyrolysis, and can be added to cigarettes to improve the aroma quality.

Abstract:In order to explore the application prospect of veterinary drug fluralaner in the control of agricultural pests, fluralaner was synthesized via seven steps with 4-bromo-2-methylbenzoic acid as starting material and its insecticidal activity was tested. The total yield was 31.11%(the 4-bromo-2-methylbenzoic acid was used for calculation) and the purity of the final product was 98%. The structure of fluralaner was confirmed by 1HNMR 13CNMR and ESI-MS. Meanwhile, lab test results indicated that fluralaner had significant contact activity against Plutella xylostella and Mythimna seperata, and the insecticidal activity reached 100% at a concentration of 1.25 mg/L, fluralaner's insecticidal activity was significantly better than tetrachlorantraniliprole. and fluralaner could be used as lead compounds for further research.

Abstract:Silica gel nanoparticles were synthesized by hydrolysis of tetraethyl orthosilicate to form gel particles. Tannic acid was added to optimize their morphology. A superhydrophobic spraying material with low sur-face energy was synthesized by using hexamethyldisilazane as surface modifier. It was dispersed in ethanol and sprayed on common surfaces such as paper, glass, aluminum foil, wood board, cotton textile and plastic foam, all of which formed super hydrophobic surfaces in a short time, and the water contact angles were above 150°. Subsequently, the self-repair properties of the prepared superhydrophobic coating after being destroyed by external force were investigated. The results show that the spray solution of 1 mg/mL only needs to be sprayed with three layers to construct the superhydrophobic surface, and it has good transparency. The sprayed glass were rubed with heavy on the sand paper for 1000 millimeter, the contact angle decreased from 153.5° to 105.5°, and then sprayed one layer back to 154°. And also, the su-perhydrophobic coating can be repaired by organic solvent quickly and easily after being damaged by ex-ternal force.

Abstract:Copolymers p (DMAE-co-[HVIM]Br) were prepared by free radical polymerization using 1-dodecyl-3-vinylimidazole bromide [HVIM] Br and dimethylaminoethyl methacrylate (DMAEMA) as raw materials and azodiisobutyronitrile (AIBN) as initiator. Namely,[HVIM] Br was synthesized from1-bromododecane and an ionic liquid such as 1-vinylimidazole. Then amphoteric polymer p (DMAE-co-[HVIM]Br) PS was synthesized by quaternization of copolymer with 1,3-propionic lactone. The structure of the products were characterized by infrared spectroscopy (FT-IR), nuclear magnetic resonance (1H-NMR). Then the combination of amphoteric polymer and castor oil in different proportions was applied to the fatliquoring process of leather. The structure and morphology of the wet white leather after fatliquoring were studied by SEM and ultra-deep field microscopy. The softness and physical and mechanical properties of the leather after fatliquoring were measured. The results showed that the softness and physical and mechanical properties of the leather treated with the synthesized amphoteric polymer were improved.

Abstract:Abstract: The rod-shaped FeMoO4 was synthesized by hydrothermal method using FeSO4·7H2O and Na2MoO4·2H2O as raw materials, and its structure and morphology were characterized by using XRD, Raman and SEM. It studied the performance of FeMoO4 activated persulfate. With phenol as the target pollutant, the effects of sodium persulfate concentrations, phenol initial concentrations, initial pH of phenol solution and temperature on the degradation rate of phenol were investigated, and the types of free radicals that played a major role in the system were initially explored. The results showed that the persulfate activated by FeMoO4 showed good performance in the degradation of phenol between pH=2.00 and pH=11.00, and the maximum dissolution of iron ion was 1.663 mg/L. The optimum degradation conditions were 0.4 g/L of FeMoO4, sodium persulfate/phenol molar rates of 25∶1, the initial pH of 3.00. In the case of this, the phenol degradation rate was 97.20% in 6 h at 30℃. The degradation of phenol by FeMoO4/Na2S2O8 matched first order kinetic. The calculated activation energy was 53.49 kJ/mol. The results of the free radical quenching experiment showed that SO4-· was the primary oxidant for the degradation of phenol.

Abstract:Photochromic microcapsules with polymethyl methacrylate as the shell material and spiropyran photochromic dyes as the core material were prepared by solvent evaporation method. FTIR, SEM, particle size analyzer, spectrophotometer, and colorimeter were used to characterize the micro-morphology, particle size, and color of the microcapsules. The results show that the core-shell mass ratio (core / shell) has a significant effect on the morphology and performance of the microcapsules. When the core-shell mass ratio is 2: 1, the microcapsules have good color performance, and the △ECMC before and after color change is 20, and the microcapsules have a strict surface and a smooth surface. When the core shell mass ratio is larger than 2: 1, the microcapsules cannot be coated well. The photochromic microcapsules immediately change color when exposed to ultraviolet light, and the complete discoloration time is 16s. After 30 cycles of UV-visible light, it still present excellent photochromic sensitivity.

Abstract:Ethyl cellulose (EC) and modified silica(m-SiO2) were proposed for preparing composite film by the blending casting method. The microstructure of the composite film was characterized by SEM and FT-IR. The physical and chemical properties of films were investigated. The results showed that the nanoparticles were uniformly distributed in the film to form a uniform porous structure when the volume ratio of the m-SiO2 alcohol sol to the EC alcohol solution was 3:2. The film material showed good surface hydrophobicity and the water static contact angle (WCA) of it could reach 145°. The tensile strength(TS) and elongation at break(EB) of the film were 10.452 MPa and 5.40 %, respectively. The water vapor transmission coefficient (WVP）of the film was 0.549 gmm/m2hkPa. For the film(EC-Si3) , the release rate of the curcumin in n-hexane simulation solution was higher than that in the distilled water. Based on the above characteristics, the film was expected to be used as a packaging material for lipid foods.

Abstract:Pore pressure transmission is one of the important mechanisms for the instability of mud shale wellbore, and nano-micron scale graphene oxide research provides a new way for pore shale plugging. The pore structure of Longmaxi formation mud shale in Sichuan was characterized by scanning electron microscopy (SEM) and nitrogen adsorption; Graphene oxide (GO) with thickness of 1.2 nm and average slice size range from 197 nm to 969.9 nm was prepared by modified Hummers method, and its plugging performance was evaluated by pressure transmission experiments; Based on SEM and X-ray energy dispersive spectroscopy(EDS) tests of shale after plugging, the main mechanism of GO plugging shale core was discussed. The results show that GO with size of 969.9nm and mass fraction of 0.1% has the most obvious effect of resisting pressure transmission; The transmission time of 1MPa differential pressure is 1000s, while the transmission time of distilled water is 30s; GO which is a semi-transparent flocculent film stacked on the surface of the core filled and sealed core nano-micron pores.

Abstract:The traditional Fischer-Tropsch synthesis focuses on the production of long chain saturated hydrocarbons such as wax/oil, of which the “metal/acidic oxide” interface of the catalysts can polarize and stabilize the reaction intermediates, thus promoting hydrogenation and C—C coupling, and contributing to the formation of longer chain alkanes. However, lower olefins are unsaturated short-chain hydrocarbons. In order to obtain high value-added lower olefins directly from syngas, the design concept should be the opposite of the traditional Fischer-Tropsch method for the purpose of producing long-chain alkanes. Therefore, we focus on the fundamental research of the "weak hydrogenation metal/solid base support" Fischer-Tropsch to olefins catalysts, use the surface basic support and basic potassium promoter to reverse the status of above-mentioned interface between "metal/acid oxide" in the traditional catalysts, weaken the promotion of hydrogenation and C—C coupling, and achieve the purpose of inhibiting hydrogenation and C—C coupling. The ratio of olefin to paraffin (O/P) of a Fe/K/Mg—O—Al series catalyst depends on its integral area of the high temperature peak in CO2-TPD profile. Under the same passivation treatment at 1200℃, compared with the weak base catalyst supported by simple oxide MgO, the strong base catalyst supported by composite oxide MgAl2O4 significantly increased the hydrocarbon product distribution value of C2=-C4= hydrocarbon by 84%, and the C2-C4 olefin/paraffin ratio by 266%.

Abstract:Nano-SiO2 modified waterborne polyurea is prepared by sol-gel method，with isophorone diisocyanate (IPDI), polyether amine (D2000), dimethylolpropionic acid (DMPA), ethylenediamine (EDA), 3-aminopropyltriethoxysilane (KH550)and triethyl Amine (TEA) as the main raw material，nano-silica (SiO2) as modifier. The structure and properties of the polymer were characterized by FTIR, TEM, SEM and TGA, and the effects of nano-SiO2 content on the performance of waterborne polyurea emulsion and film were studied. The results show that the particle size of waterborne polyurea increased, the viscosity increased, the water absorption of the coating decreased, the tensile strength increased first and then de-creased, the contact angle increased and the elongation at break decreases, with the increase of nano-SiO2 content. When the mass fraction of nano-SiO2 was 2%, the comprehensive performance of the coating film was the best, the water absorption rate and the contact angle was respectively 11.12% and 75.24?; Compared with the unmodified coating film, thermal decomposition temperature of the modified coating film was increased by 10 ?C approximately.

Abstract:The whitening effects of pine salt, plum salt and bamboo salt were evaluated in vitro, and their inhibitory effects on tyrosinase monophenolase and diphenolase activity were studied in vitro. The B16 melanoma cell model was used to explore effects of salts on intracellular tyrosinase activity, cell proliferation and migration and arbutin was used as a positive control. The results showed that plant salts are rich in elemental composition and the aqueous solutions are alkaline, and pine salt, bamboo salt and plum salt showed extremely significant concentration-dependent inhibition of tyrosinase activity (p<0.01). When the concentration of the three plant saline solution was 50.0 g/L, the inhibition rates of tyrosinase monophenolase were 94.8%, 94.8%, and 48.2%, respectively, and the inhibition rates of diphenolase were higher than 92.0%. When acting on B16 cells, compared with the original salt, the inhibitory effect of 5.0 g/L plants salt on the growth of B16 cells was not obvious, but it inhibited the lateral migration. The inhibitory effect of plant salt on the intracellular tyrosinase activity of B16 cells was better than that of arbutin, and the intracellular tyrosinase of 7.5 g/L plum salt group is only 8.76%, and the inhibition effect is better than that of pine salt and bamboo salt. The above results indicate that plant salt can inhibit the activity of tyrosinase and has no additional toxicity to B16 cells, showing its potential as an inorganic tyrosinase inhibitor, and has a good potential application value in human whitening.

Abstract:Suspension of conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was prepared by chemical oxidation synthesis in water system using 3,4-ethylenedioxythiophene (EDOT) as monomer. Poly(sodium-p-styrenesulfonate) (PSS-Na) was used as dispersant and doping agent. PEDOT:PSS free-standing flexible conductive film was prepared by vacuum filtration. The structure of the polymerized product was characterized by FTIR and UV-Vis. The conductivity, morphology and mechanical properties of PEDOT:PSS film were characterized by four-probe resistance test, SEM and tensile strength test, respectively. The results showed that PEDOT:PSS was successfully polymerized and the optimal conductivity (19.19 S/cm) was achieved when the mole ratio of oxidant to monomer was 0.875. The thickness of free-standing film is approximately 18 μm. The tensile strength of free-standing film reached 45 to 60 MPa at 25 °C and 40% to 60% relative humidity. This indicates that the prepared PEDOT:PSS free-standing film possessed both good conductivity and mechanical properties.

Abstract:Under the microwave, a kind of polymer flame retardant dust suppressant was synthesized by using epoxy resin (E-51), butyl acrylate (BA), methacrylic acid (MAA), styrene (St), phytic acid as raw materials, K2S2O8 and NaHSO3 as initiator, alkyl phenol ether sulfosuccinate (MS-1) and octylphenol polyoxyethylene ether (OP-10) as emulsifier. Structural characterization and performance tests were carried out by FTIR, SEM, TGA, etc. The results show that when m(BA) : m(St) = 2 : 1, the amount of the initiator was 0.6% (based on the total mass of monomers, the same below), the amount of the emulsifier was 6%, m(MS-1) : m(OP-10) = 2 : 3, the amount of the E-51 was 6%, the amount of the phytic acid was 2%, the microwave power was 100 W, the microwave irradiation time was 90 min. The synthesized emulsion was stable, the particle size distribution was uniform, and the film formation was soft. The coal sample sprayed with flame retardant dust suppressant was compared with the coal sample sprayed with water. The water loss rate, wind erosion loss rate, shock loss rate and CO concentration decreased by 34.5%, 33.6%, 33.2% and 67%, respectively.

Abstract:cotton fabric was prepared by grafting polymerization using vinyl-containing polydimethylsiloxane (VPDMS) and octavinyloctasilasesquioxane (VPOSS) as raw materials, and cerium ammonium nitrate (CAN) as initiator.Moreover, thiol/ene click reaction was adopted to introduce long chain alkyl monomers and fluorine-containing monomer onto fabric that had vinyl remained. The chemical structure and morphology of the modified fabric were characterized by infrared spectrometer (FTIR), X-ray photoelectron spectrometer (XPS) and scanning electron microscope (SEM). The results showed that VPDMS and VPOSS were grafted onto fibers successfully, besides, the secondary modification was realized by thiol/ene click reaction. The hydrophobic properties of the modified fabric were characterized by the contact angle measuring instrument. It was found that the contact angle reached 153° when MVPDMS10% and VPOSS were copolymerized, and the contact angle reached 164° after the secondary modification by PFDCMC.Abrasion test, laundering test and acid resistant test were used to test the durability of hydrophobic modification. It was found that PFDCMC secondary modification fabric had the best hydrophobic performance. Furthermore, self-healing property was also observed.

Abstract:Complex emulsion has attracted much attention due to its incompatible components and can be used as a template to prepare anisotropic materials. It has become a new hotspot of research for its special structure and properties. It is key to develop new methods that can easily and mass produce complex emulsion with tunable morphology of microstructure. In this paper, the methods to control the topo-logical structure of complex emulsions at home and abroad were emphatically described, mainly in-cluding microfluidics, phase separation, one-step high-speed shearing and stimuli-responsive regula-tion, and the advantages and disadvantages of different control methods were explained. However, the current reviews focus on the research progress of individual methods and do not compare differ-ent methods. It is a developing trend that the method of controlling the topological structure is simple, pollution-free, intelligent and mass-produced. The application of the complex emulsion in optical lenses, sensors, materials and biomedicine were introduced.

Abstract:The long-term inefficient use of pesticides increases the cost of agricultural production, resulting in a large loss of pesticides, threatening food safety and the ecological environment. Improvement of existing pesticide formulations by using pesticide controlled release technology is an effective measure to improve pesticide utilization. Stimuli-responsive polymers are a class of emerging carrier materials that sense and respond to changes in the surrounding environment to achieve targeted controlled release of active ingredients. In the field of biomedicine, the research of stimuli-responsive polymers as drug carriers has been quite extensive, and it has been effective in the targeted treatment of cancer. However, the application in the field of pesticide controlled release is still in the basic stage. There are still a series of factors restricting the development of such materials, such as carrier cost, pesticide loading performance, system stability, and application of processing technology. In this paper, the research progress and application status of stimuli-responsive polymer materials in the field of controlled release of pesticides are reviewed, and the application prospect was also discussed.

Abstract:Nano-scale TS-1 molecular sieves were synthesized using low-cost reagents (silicasol and tetraprop-ylammonium bromide) by steam-assisted method with assist of seeds. The molecular sieve was post-modified using ethylamine and tetrapropylammonium bromide mixed solution by secondary hydro-thermal crystallization. Then, the TS-1 zeolite with high catalytic activity containing hexacoordinate tita-nium was produced. Then it was characterized by X-ray diffraction, UV diffuse reflectance visible spec-trum, ultraviolet Raman spectroscopy, Fourier transform infrared spectroscopy, solid state nuclear mag-netic resonance, N2 physical adsorption-desorption. Finally, the epoxidation of propylene was used as a probe reaction to evaluate the catalytic performance of the samples. The results showed that the nano-scale TS-1 synthesized by post-modification with hexacoordinate titanium species possessed im-proved pore structure and obviously increased specific surface area. The activity of catalyzing the epoxi-dation of propylene was obviously improved. The conversion rate of hydrogen peroxide was significantly increased from 47.59% to 85.79%.

Abstract:GO/GA-g-PAMPS composite hydrogel was prepared by one-step hydrothermal reaction with Graphene Oxide (GO), gum Arabic (GA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as raw materials.The structure of the hydrogel was characterized by FTIR, XRD and SEM.The effects of GO concentration, solution pH, initial dye concentration, adsorption time and adsorption temperature on the adsorption properties of cationic dyes methylene blue (MB) and crystal violet (CV) were studied.The results showed that the hydrogel had a good adsorption effect on cationic dyes. When the GO concentration was 0.3mol/mL, the gel dosage was 0.05g, the solution pH was 7, the temperature was 50℃, and the initial dye concentration was 200mg/L, the adsorption capacity and adsorption rate of the gel on MB and CV were 395.68, 381.70mg/g and 98% and 96%, respectively.After 5 cycles, the adsorption rates of MB and CV were still up to 82.6% and 81.2%.The adsorption isotherm and kinetics showed that the adsorption of MB by gel was more consistent with Freundlich model, while the adsorption of CV was more consistent with Langmuir model, and the quasi-second-order kinetic model could better describe the adsorption process of two cationic dyes.Thermodynamic studies showed that the adsorption of the two dyes by the composite hydrogel is spontaneous, endothermic and chaotic.

Abstract:2-(Dimethylamino)ethyl methacrylate has excellent properties of non-toxicity and degradability, but little research has been done on the direction of corrosion inhibitors. In this paper, two kinds of quaternary ammonium salts (DMA-1 and DMA-2) were synthesized by using 2-(Dimethylamino)ethyl methacrylate as the matrix and chloropropene and benzyl chloride as bridging groups. The obtained product was con-firmed to be consistent with the design by infrared spectroscopy and nuclear magnetic resonance spec-troscopy. Then, the corrosion inhibition performance of Q235 steel in 1 mol/L hydrochloric acid contain-ing DMA-1 and DMA-2 was tested by weight loss experiment, electrochemical experiment, AFM and con-tact angle. And their adsorption and corrosion inhibition mechanisms on the surface of Q235 steel were discussed. The results show that at higher temperatures, DMA-1 and DMA-2 can still be firmly adsorbed on the surface of Q235 steel, and when the concentration of corrosion inhibitor added is 100 mg/L, the corrosion inhibition rate can still reach 92.7% or more. So it shows good corrosion inhibition performance, and DMA-1 has better corrosion inhibition effect than DMA-2. The thermodynamic calculation results show that the adsorption of DMA-1 and DMA-2 on the surface of Q235 steel is chemical adsorption, the process is spontaneous and exothermic, and it is consistent with Langmuir isotherm adsorption. It is a good anode type corrosion inhibitor. Frontier chemical calculations show that DMA-1 is easier to provide or accept electrons, and further study the molecular structure and active sites of DMA-1 and DMA-2.

Abstract:The content of free amino acids in pork enzymatic hydrolysate was analyzed by HPLC in order to explore the effect of proteases on sparerib soup flavoring. Sensory analysis and electronic nose were used to analyze the flavor of flavoring samples. The results showed that the best way to make the sparerib soup flavoring was that m(papain)∶m(pineapple protease)=2∶1, and addition of enzyme 0.2% (based on the mass of meat, the same below). The total content of umami amino acids in the optimized hydrolysate was the highest (26.70 g/L). The correlation analysis of sensory evaluation and electronic nose indicated that the samples prepared by different proteases could be distinguished from each other by principal component analysis.

Abstract:Four kinds of long-chain α-olefins, including hexene, octene, terpene, and decadiene, were selected as the monomers in the homopolymerization catalyzed by TiCl4/Al(i-Bu)3 to prepare ultra high relative molecular weight polyolefin drag reducing agent. The effects of polymerization conditions on the relative molecular weights of the polymers were investigated. The effect of the side chain length of the monomers on the crystallinity and drag reduction performance of the polymer were also discussed in detail. In order to obtain a relative molecular weight of higher than 3.50×106, the optimum polymerization conditions were determined as that the content of TiCl4 in the main catalyst was 5.2×10-4 mol/L, the volume ratio of monomer to solvent is 1:1, and the reaction time was at least 1440 mins. The 13C NMR results indicated that the polymerization was completed, and the resultant homopolymers were designated products. DSC and XRD measurements showed that as the side chain length of the polyolefin was increased, the crystallization was enhanced. The rotating disk system was used to test the polymer drag reduction rate. The results showed that the drag reduction rate tended to increase with the increase of the side chain length of the drag reduction agent when their relative molecular weights were the same.

Abstract:Reaction of dibenzofuran(Ⅱ) with sec-butyl lithium (s-BuLi)/tetramethyl ethylene diamine (TMEDA) /acetaldehyde(CH3CHO) gave 1,1'-(dibenzo[b,d]furan-4,6-diyl)bis(ethan-1-ol)(Ⅲa) which was then oxidized by pyridinium chlorochromate (PCC) to yield 1,1'-(dibenzo[b,d]furan-4,6-diyl)bis(ethan-1-one)(Ⅳa). Subsequent reduction of IV-A by borane-dimethyl sulfide (BH3-Me2S) in the presence of a catalytic amount of  (S)-2-methyl-CBS-oxazo borane{(S)-MeCBS} followed by recrystallization gave optically pure (1R,1'R)-1,1'- (dibenzo[b,d]furan-4,6-diyl)bis(ethan-1-ol) (Ⅰ). The optimal reaction conditions are as follows: the molar ratio of Ⅱ: s-BuLi: TMEDA: CH3CHO is 1: 3: 3.3: 2.2, the molar ratio of Ⅲa: PCC is 1: 4, the molar ratio of Ⅳa: (S)-MeCBS: BH3-Me2S is 1: 0.6: 3, and the overall yield of the three-step reaction is 32%. An intramolecular hydrogen bond of compound (Ⅰ) affects further diversifications of its hydroxyl group to some extent. The racemic 1,1'-(dibenzo[b,d]furan-4,6-diyl)bis(ethan-1-amine) (Ⅶ) was obtained starting from Ⅲa via a successive process of chlorination with thionyl chloride, azidination with sodium azide and Pd/C-catalyzed hydrogenation. However, the resolution of Ⅶ by commonly used chiral carboxylic acids to obtain optically pure 1,1'-(dibenzo[b,d]furan-4,6 -diyl)bis(ethan-1-amine)(Ⅷ) was not successful.