Abstract:Here, hierarchically porous carbons are synthesized by carbonation under N2 atomsphere with glucose as carbon precursor and NaNO3 as the template. Then the samples are treated with NH3 at high temperature to obtain nitrogen doped porous carbons, which are labeled as NC-X-T (X refers to the weight ratio of NaNO3 and glucose, and T/oC refers to the annealing temperature). These materials are then characterized by N2 adsorption-desorption, XRD, XPS, SEM, and TEM to show their surface areas, pore size distribution, crystal structure, chemical composition, and morphologies detailly. Taking phenol as the model pollutant and peroxymonosulfate (PMS) as the oxidant, the effects of different experimental conditions on their catalytic performance are studied. The experimental results show that the synergistic effect of pore engineering and nitrogen doping process can greatly improve the catalytic performance of the catalyst. With 0.01 g/L PMS and 0.005 g NC-0.5-800 added, 5.3×10-4 mol/L phenol in 100 mL can be completely degraded with a rate constant of 0.397 min-1, which is superior to most metal and non-metal catalysts. Moreover, the NC-0.5-800 after stability test is characterized by XPS, and the oxidation of carbon frame is found to be the direct reason for their deactivation, while the activity can be partly recovered by high temperature calcination under N2 atmosphere.

Abstract:Employing cotton staple cellulose as raw material, cellulose microspheres were prepared by emulsification method (low surfactant dosage). XRD, optical microscope, particle size analyzer, SEM, material mechanics tester, etc. were used to characterize and test the morphology, structure and mechanical properties of cellulose microspheres. The effects of emulsifier dosage, speed, m (cellulose solution): m (liquid paraffin), solution viscosity and crosslinker dosage on cellulose microsphere size were investigated. The results showed that cellulose microspheres with an average particle size of 610 μm could be prepared under the conditions of cellulose solution (mass fraction 4%) of 10 g, crosslinker dosage of 300 μL (crosslinking degree of 3%), emulsifier dosage of 0.1 g, liquid paraffin dosage of 30 g, speed of 200 r/min, and solution viscosity of 2474 Pa?s (viscosity time of 15 min). Among them, cellulose microspheres with particle size range of 400~800 μm accounted for 54.93%. In addition, ethanol aqueous solution is used as a coagulation bath to adjust the aggregation state of cellulose chains in cellulose microspheres, thereby changing the mechanical properties of cellulose microspheres. Cellulose microspheres treated with absolute ethanol can withstand the water pressure generated by a flow rate of 60 mL/min, so that cellulose microspheres do not deform, showing good physical properties, and is expected to be used in filled column fields such as hemoperfusion.

Abstract:

Abstract:Chinese herbal medicine is a traditional natural medicine with wide sources, less drug residues, small toxic and side effects, no resistance and other excellent characteristics. Some active ingredients in Chinese herbal medicine have anti-inflammatory, antioxidant, antimicrobial and other effects, which widely used in daily health care and clinical medical treatment. In recent years, more and more high-safety, mild and low-irritating Chinese herbal active ingredients are used in cosmetics as natural additives. At the same time, the demand for cosmetics containing Chinese herbal medicines in the global market is increasing, which provides ideas and impetus for the research on the application of Chinese herbal medicines and their active ingredients in cosmetics. Firstly, the structure and function of six common active ingredients in Chinese herbal medicine, such as phenolics, flavonoids, saponins, terpenoids, carotenoids, and natural polysaccharides are summarized; Next the five major functions of the active ingredients are reviewed: including moisturizing, skin whitening, sun protection, anti-wrinkle and anti-acne and their mechanism of action; Finally, the problems of functional ingredients of Chinese herbal medicine in the application of cosmetics are put forward and the future development direction is pointed out.

Abstract:The reaction mechanism of CO2 hydrogenation to light olefins was described in detail. Aiming at the two paths of CO2 hydrogenation by the direct method and indirect synthesis low carbon olefins, this paper expounds the types of catalysts used in the two paths, summarizes the effects of additives and carriers in catalyst for CO2 conversion to olefin, and the latest research results, finally prospects the research direction of catalysts for CO2 hydrogenation to light olefins.

Abstract:Cellulose is the most abundant renewable biomass resource in nature, and its high value green utilization plays an important role in realizing the goal of "double carbon" and "circular economy". The green and efficient dissolution of cellulose is one of the important ways to realize its high value utilization. Many cellulose solvent systems are expensive, toxic and environmental threats, complex dissolution process, low dissolution efficiency, difficult solvent recovery and high energy consumption. Cellulose metal salt solution system has the advantages of high stability, low price, fast dissolution speed, simple process and so on. It is a low-cost green solvent with more application prospects. This paper reviews the dissolution mechanism of cellulose dissolved by different metal salt solutions, summarizes the key factors affecting the dissolution performance, and further reviews the application research progress of cellulose dissolved by different metal salt solutions in thin film materials, gel materials and composite materials. The advantages, disadvantages and development direction of metal salt solution in cellulose dissolution and functional application are summarized and prospected, in order to provide reference for the research and application of green and efficient cellulose dissolution.

Abstract:A fluorinated diamine monomer containing pyridine, 6-(4-(4-amino-2-(trifluoromethyl) phenoxy) phenoxy) pyridin-3-amine, was prepared by nucleophilic substitution reaction with 2-chloro-5-nitrobenzotrifluoride and 2-chloro-5-nitropyridine in turn using hydroquinone as raw material and reduction. Four new polyimides (PI) were produced by the conventional two-step method with several dianhydrides. The solubility, thermal stability, mechanical properties, and optical properties of the resulting PIs were characterized. The results showed that the PIs based on 4,4’-oxydiphthalic anhydride (ODPA) and hexafluorodianhydride (6FDA) have outstanding solubility in common organic solvents. In N2 atmosphere, the temperatures of these polyimides with 5% and 10% weight loss are above 548 ℃ and 566 ℃, and the glass transition temperatures are between 226 and 290 ℃, which have excellent thermal stability. These PI films have good optical transparency and mechanical properties with cut-off wavelengths of 382~438 nm, transmittance at 500 nm of 62%~78%, tensile strength of 98.3~110.5 MPa, tensile modulus of 1.86~2.14 GPa, and elongation at break of 9~23 %.

Abstract:In order to endow the leather with superior antibacterial behavior, metal-organic frameworks was synthesized by using CA-CPL as the template. Subsequently, CA-CPL@ZIF-8 was applied to leather finishing. The results of XRD, SEM and TEM showed that the CA-CPL@ZIF-8 with complete crystal structure was successfully grown by turning the size of the template. The results illustrated that antibacterial effect on E. coli and S. aureus of leather increased with the increase of CA-CPL@ZIF-8 content (when the dosage was 0.8%, the inhibition zone of S. aureus was 4 mm).

Abstract:In this paper, sodium alginate (Na-Alg) was grafted with glycidyl methacrylate (GMA), and the structure and properties of alginate hydrogel were adjusted by photoinitiated radical polymerization and bivalent cationic (M2+，M represents Ca or Ba) coordination crosslinking. The results of 1H NMR analysis showed that the hydrogen signal associated with GMA appeared in Alg-GMA. In the presence of photoinitiator Irgacure 2959, Alg-GMA can form hydrogel rapidly by irradiation of ultraviolet light with wavelength of 365nm in 90s. The results of SEM and compressive stress-strain showed that Ca2+ and Ba2+ could regulate the structure and properties of the photo-crosslinking alginate gel grafted by GMA, which may be related to the dsp2 hybridization mode of Ca2+ in the planar quadrate configuration and d2sp3 hybridization mode of Ba2+ in the regular octahedral configuration. The results of in vitro release experiments showed that both Ca-Alg-GMA and Ba-Alg-GMA had the ability of intestinal targeted drug release. The hemolysis rate and MTT test showed that Ca-Alg-GMA and Ba-Alg-GMA had good blood compatibility and low cytotoxicity. This study expands the preparation method of new materials based on alginate and its application space in the field of biomedicine, and provides theoretical basis and experimental support.

Abstract:In order to suppress the local electric field distortion caused by the difference of dielectric constant between Barium titanate(BT) nanoparticles and Poly(m-phenyleneisophthalamide)(PMIA), TiO2 and polydopamine(PDA) were coated on surface of BT to generate core-double-shell structured PDA@TiO2@BT nanoparticles(PTBP), then the PTBP nanoparticles were added to PMIA solution to fabricate PTBP/PMIA dielectric composites. The results show that the dielectric constant of PMIA dielectric composite obviously increases with increment of PTBP content. When PTBP content reaches up to 10 wt%, the dielectric constant of PTBP/PMIA dielectric composite increases by 57.1%, compared with that of as-prepared PMIA at 103 Hz. The dielectric properties of PTBP/PMIA dielectric composites also maintain stable at high temperature(>150 ℃). In addition, PTBP nanoparticles significantly improve the energy storage properties of PTBP/PMIA dielectric composites. When the PTBP content is 10 wt%, the energy storage density(Ue) and discharge energy density(Ud) of corresponding PMIA dielectric composite are 1.91 J/cm3 and 1.23 J/cm3 at room temperature and 250 MV/m, respectively, which are 103.2% and 61.8% higher than that of as-prepared PMIA.

Abstract:Sulfonic acid functionalized phosphomolybdic acid incorporated-UiO-66 (HPMo@UiO-66-SO3H) was prepared by an in-situ graft copolymerization method using zirconium (Ⅳ) chloride, phosphomolybdic acid hydrate, 1,2,4,5-benzenetetracarboxylic acid and (3-mercaptopropyl) trimethoxysilane as raw materials, and characterized by XRD, FTIR, SEM, EDS, XPS, N2 adsorption-desorption and TG-DTG. HPMo@UiO-66-SO3H was used to prepare medium-chain structured phospholipids enriched in caprylic acids and capric acids through transesterification between soybean lecithins and medium-chain fatty acids (caprylic acids and capric acids), and the reaction conditions were optimized by orthogonal experiment method. Moreover, the reactivity of HPMo@UiO-66-SO3H was compared with HPMo, UiO-66, HPMo@UiO-66 and UiO-66-SO3H materials, and the recycling of HPMo@UiO-66-SO3H was researched as well. As a result, it was certified that HPMo@UiO-66-SO3H exhibited a mesoporous structure possessing numerous HPMo and sulfonic acid active components, and a promising reactivity for the synthesis of medium-chain structured phospholipids due to the synergistic effect of the two components. The incorporation of medium-chain fatty acids in product reached as high as 94.31percent with 44.21 percent of caprylic acid and 50.10 percent of capric acid at 50 ℃ within 4 h when the HPMo@UiO-66-SO3H dosage was 5 percent of the total mass of soybean lecithins, caprylic acids and capric acids, and the m(soybean lecithins)∶m(caprylic acids)∶m(capric acids) was 1∶10∶10. Noticeably, HPMo@UiO-66-SO3H could be recycled 5 times with no obvious deactivation. A probable reaction mechanism of medium-chain structured phospholipid synthesis using HPMo@UiO-66-SO3H responsible for the process is presented.

Abstract:Five aromatic spices (star anise, cinnamon, bay leaf, shallot and ginger) were selected and cooked with pork pancetta at different additions, and the effects of different combinations of aromatic spices additions on the flavor profile and flavor substances of pork soup were investigated by sensory evaluation, electronic nose and gas chromatography-mass spectrometry coupling. The results showed that the optimal spice addition levels were 0.130% star anise, 0.050% bay leaf, 0.027% cinnamon, 0.800% shallot and 0.130% ginger, and the spice addition levels had a greater effect on the flavor profile of pork broth. A total of 56 volatiles were identified in the pork broth from four different concentrations of the combined spices. The combined spices introduced cinnamaldehyde, aniseed brain and other substances to the pork broth. The relative contents of hexanal, (2E,4E)-decadienal, 1-octen-3-ol, 3-hydroxy-2-butanone and 2-pentylfuran increased with the addition of spices, indicating that some components of the spices may have an effect on the oxidative degradation of fats and on the merad reaction. This experiment provides theoretical support for the improvement of flavor of meat products.

Abstract:As a natural aromatic polymer, lignin has been proven to be a natural broad-spectrum sunscreen agent due to its good UV protection properties. In general, lignin is a complex and heterogeneous macromolecule composed of guaiacyl (G), syringyl (S), and p-hydroxyphenyl (H) units. However, in addition to the three conventional structural units, some unconventional structures such as ferulates, p-coumaric acid, and tricin are also found in gramineous lignins, which leads to considerable impacts on the anti-UV radiation abilities of lignin. Herein six lignin model compounds, including tricin, ferulic acid, p-coumaric acid, sinapic acid, and C5-C5-linked dimers, were designed and applied to investigate the UV protection abilities of typical unconventional structures in straw-like lignin in combination with three different alkali lignins of rice straw, wheat straw, and oat straw. After the addition of different models or alkali lignins to the pure cream or commercial sunscreen, it was found that SPF values of the model-based or lignin-based sunscreens were increased but varied. The highest increase in SPF value was the sample of adding tricin (0.0558 mmol, about 2% by weight) into the low SPF commercial sunscreen, followed by ferulic acid, from 1.06(10.00) to 4.67(38.49) and 3.77(34.69), respectively, displaying the significant increment of the UV protection ability. In contrast, the increments of SPF values after adding p-coumaric acid or sinapic acid into the pure cream or sunscreens were much lower, which reveals, to some extent, the role of methoxy groups in lignin’s UV resistance ability. Considering lignin structural analysis, it was shown that lignin with the high retention of tricin was beneficial to the UV protection effect; meanwhile, the presence of ferulic acid and p-coumaric acid in lignin also significantly impacted the UV radiation resistance of gramineous lignin. Among the three different lignins, alkali lignin with higher tricin content has more apparent advantages as a sunscreen agent, which provides new insights and a theoretical basis for separating gramineous lignin and its following high-value utilization.

Abstract:Abstract: Using p-chlorobenzyl chloride as raw material, Friedel-Crafts acylation of anisole and p-chlorobenzoyl chloride was catalyzed by FeCl3, followed by hydrolysis to produce 4-chloro-4 '- hydroxybenzophenone, which reacted with acetone and chloroform by condensation to obtain fenofibrate acid. And then fenofibrate was synthesized by esterification with fenofibrate acid and isopropanol and further purification to prepare fenofibrate crystals. The structure of the product was characterized by MS, FTIR, X-ray diffraction, 1HNMR and 13CNMR. The crystal structure of fenofibrate was analyzed by X-ray crystal structure analysis. The effects of feed rate, reaction temperature and refining solvent on the yield were investigated. The optimum conditions for the synthesis of 4-chloro-4'- methoxy benzophenone are as follows: n(anisole):n(FeCl3):n(4-chlorobenzoyl chloride)=4.0:0.0125:1.0, acylation under 145~155 ℃ for 6h. The optimized conditions for synthesis of fenofibrate acid were as follows: n(CHCl3):n(4-chloro-4'-hydroxybenzophenone)=2.5:1.0, and crystallization with toluene at 10 ℃. The optimized conditions for synthesis of fenofibrate were as follows: n(fenofibrate acid):n(isopropyl alcohol):n(H2SO4)=1.0:3.0:2.0, purification with isopropyl alcohol to obtain crystals. The total yield and content of fenofibrate were 56.17% and 99.93%, respectively.

Abstract:By comparing the different Camellia oleifera extracts from by-products of the tyrosinase activity inhibition in vitro, and select the best inhibiting effect of Camellia oleifera flowers extract, and using the kojic acid as the positive control, using human A375 melanoma cells in vitro culture model and zebrafish embryo model to explore its influence of tyrosinase activity and melanin synthesis in vivo and in vitro. The results showed that Camellia oleifera flowers extract, Camellia oleifera leaves extract, Camellia oleifera shell extract and Camellia oleifera meal extract showed good inhibitory effects on tyrosinase activity, and Camellia oleifera flowers extract had the best inhibitory effect with an IC50 of 0.49 mg/mL. Compared with kojic acid, Camellia oleifera flowers extract showed significant inhibition of intracellular tyrosinase activity and melanin synthesis (P <0.01). When the concentration was 160 μg/mL, the inhibition rate of intracellular tyrosinase activity reached 34.30%, and the relative melanin content decreased by 26.41%. When the exposure concentration of Camellia oleifera flowers extract was 100μg/mL, the inhibition rate of tyrosinase in zebrafish reached 32.47%, and the relative melanin content was reduced to 64.39%. The effect was similar to kojic acid. Camellia oleifera flowers extract showed good tyrosinase inhibition in vitro and in vivo, and significantly inhibited melanin production in cells and zebrafish, with high safety. It is a potential whitening functional component, and has a high application prospect in the field of daily cosmetics.

Abstract:Using sweet corncob polysaccharide and chitosan as coating materials, glycerol and gum arabic as thickeners, a polysaccharide-based composite coating film was prepared. The tensile strength of the coating film was used as an indicator to determine the ratio of chitosan to acetic acid 1:100, the mass concentration of gum arabic 0.15 g/mL, the ratio of chitosan solution to gum arabic solution 1:2, the amount of glycerol added 1.8 mL, and the amount of sweet corncob polysaccharide nano emulsion added 1.2 mL.The sweet corncob polysaccharide-based coating film prepared by the response surface optimization formula has a tensile strength of 92.37±2.07 KPa.The coating film was applied to the preservation of Millennium fruit, kumquat and grape, and the preservation effect was studied. The spoilage rate, weight loss rate, color difference, polyphenol content, titratable acid and soluble solids of fruit were used as evaluation indexes. Principal component analysis showed that the cumulative variance contribution rate of PC1 and PC2 was 92.353% . It showed that the coating has a certain effect on fruit preservation, which provides a theoretical basis for the application of sweet corncob polysaccharide nano emulsion in coating preservation, and can provide some feasible support for subsequent research.

Abstract:In order to prolong the shelf life of the product and intelligently monitor its quality changes, the freshness indicator packaging film was prepared by casting method using acetylation and phosphorylation dual-modified cassava starch as raw material and anthocyanin as color indicator. An orthogonal experiment was conducted to investigate the interaction effects of cassava starch type, cassava starch mass concentration, glycerin content and anthocyanin concentrate content on the physical, mechanical and water vapor barrier properties of packaging films. Finally, the color intelligent response characteristics of the optimal film in fish fillets packaging were analyzed. The results showed that when the mass concentration of acetylated distarch phosphate was 40 g/L, the glycerol content was 30% (based on the gravity of cassava starch, the same below), and the anthocyanin concentrate content was 30% (based on the gravity of cassava starch, the same below), the comprehensive performance of the prepared packaging film (S1 film) was optimal. And the transparency, hydrophobicity, water vapor barrier capacity and tensile strength of S1 films were increased by 36.18%, 72.38%, 40.00% and 353.37%, respectively, compared with the natural cassava starch films. The S1 film was pink, purple and yellow-green in acidic, neutral and alkaline environments, respectively, and was sensitive to the ammonia gas. The color change of S1 films could indicate the freshness level of fish fillets. Purple was considered “fresh”, gray was considered “semi-fresh”, and green was considered “deteriorated”.

Abstract:Biomass derived porous carbon materials have large specific surface area, good pore structure and excellent conductivity, but there are few surface active sites, which limits its application in electrochemical sensing. In order to improve its electrochemical activity, an N,P co-doped biomass pyrolytic carbon material was prepared using lotus root as biomass feedstock and ammonium polyphosphate (APP) as nitrogen and phosphorus dopant. The material was characterized in terms of structure, morphology and elemental composition using SEM, TGA, XRD, XPS and FTIP. Using this material as electrode modification material, an electrochemical sensor for detecting rutin was constructed. The electrochemical performance of the sensor and the electrochemical behavior of Ru on different electrodes were studied by EIS, CV and DPV. The results show that the modified electrode prepared by the material with the mass ratio of lotus root to APP of 1:1 and pyrolysis temperature of 800℃ has the best detection effect on RU. Under optimal conditions, the RU concentration has a linear relationship with the response current of the modified electrode, and the detection range is 0.01~10.0 μmol/L, the minimum detection limit is (1.19±0.04)×10-8 mol/L（S/N=3）。In addition, the modified electrode has a good effect on the determination of RU in Shuanghuanglian oral liquid and healthy human urine samples.

Abstract:The flame retardant F-ATP was prepared by surface modification of attapulgite (ATP) with fischer-tropsch wax (FTW). The morphology, structure and thermal stability of the flame retardant F-ATP were characterized. The results showed that the aggregation of the modified ATP disappeared and its thermal stability was significantly improved. The flame retardant F-ATP was added to poly (terephthalic acid/butylene adipate) (PBAT) matrix to prepare PBAT/F-ATP composites. The LOI, UL-94, CCT, FTIR-TG, raman spectroscopy and SEM were used to analyze the flame retardancy property of PBAT/F-ATP composite. The results showed that when adding 10 wt% flame retardant F-ATP, the flame retardancy property of PBAT-3 composite was the best, where its LOI value and UL-94 grade reached 23.5% and V-1 grade, and the droplet phenomenon was greatly improved. In addition, compared with the composite including 10wt% ATP, the PHRR and THR values of PBAT-3 composites decreased by 4.99% and 26.11%, respectively. At the same time, the TG-IR results showed that the release of gaseous products of PBAT-3 composites decreased in the whole combustion process, which had a good gas phase flame retardant effect. The outstanding flame retardant property was mainly due to the addition of flame retardant F-ATP, where the PBAT/F-ATP composites formed a dense and continuous carbon layer, which effectively insulates the heat/mass transfer between the interior and exterior of the PBAT/F-ATP composite.

Abstract:The HKUST-1@APP was prepared by loading HKUST-1〔Cu3(BTC)2, BTC means trimesic acid〕on the surface of ammonium polyphosphate (APP) via solvothermal method. The flame-retardant composites (HKUST-1@APP/EP) were prepared by mixing different amounts of HKUST-1@APP with epoxy resin (EP). The flame retardant and mechanical properties of EP composites were investigated by horizontal and vertical combustion tester,, oxygen index tester, electronic tensile machine, et al. The results showed that while adding 5% of HKUST-1@APP, the limiting oxygen index of EAC-5 was 27.5%, and the vertical combustion test (UL-94) passed the V-1 level. The AD/AG(the peak area ratio of D and G peaks formed by the vibration of carbon atoms in amorphous carbon and SP2 hybrid carbon atoms in graphite carbon in Raman spectrum)of the residual char was reduced to 0.043 compared to 0.3161 of EA-5 which was added 5% APP. It indicated that HKUST-1@APP could improve the char layer produced during combustion and make the char layer more continuous and graphitized.

Abstract:In order to improve the flame retardant properties of polyester and solve the phenomenon of droplets of polyester fabrics, the coating liquid was prepared by blending graphene microcapsules with sodium alginate, and the coating polyester fabric was prepared by dip rolling method. The flame retardant properties, mechanical properties and thermal properties of the coated polyester fabric were examined, and the results showed that the limit oxygen index of the polyester fabric after the 25g/L sodium alginate and 1g graphene microcapsule flame retardant coating was increased from 19.7% to 28.34%, reaching the standard of flame retardant fabric. The finished polyester fabric reaches the V-0 standard, and the phenomenon of droplets of polyester disappears. The breaking strength of the fabric was reduced from 135.21N to 106.77N. Before and after the coating treatment, the temperature at which the fabric reaches the maximum thermal decomposition rate does not change significantly, the residual carbon rate increases from 12.07% to 26.98%, and the maximum mass loss rate decreases from 1.79%/°C to 0.96%/°C. At the same time, the enthalpy value of the polyester fabric before and after finishing increased from 58.4J/g to 68.4J/g. The thermal conductivity of the fabric was increased from 0.587 W/cm.°C× 10-4 to 0.842W/cm.°C×10-4, and the thermal properties were fully improved. The residual carbon formed after the fabric is burned from none to continuous and dense.

Abstract:Composite inorganic-organic acid magnesium corrosion inhibitor was designed and synthesized with stearic acid, palmitic acid, oleic acid, naphthenic acid, and active magnesium oxide as the main raw materials. The application performance and mechanism were tested. The results show that the composite magnesium carbonate-magnesium naphthenate corrosion inhibitor has a good corrosion inhibition effect. When the dosage is 1000 μg/g, the sulfur trioxide content in flue gas is reduced by 70.0%, and the corrosion rate of the steel sheet is reduced by 21.6%. Further analysis shows that the synthesized product is a stable colloidal system. This colloidal system was formed by nanoscale magnesium carbonate particles encapsulated by organic acid magnesium micelles. This effectively solves the problem of poor dispersion of magnesium carbonate particles in fuel and facilitates the synergistic effect of inorganic-organic magnesium salts. As the fuel burns, vanadium pentoxide, which can catalyze the conversion of sulfur dioxide to sulfur trioxide, combines with magnesium oxide produced by the decomposition of corrosion inhibitors. The concentration of vanadium pentoxide decreased, so the content of sulfur trioxide in flue gas decreased, ultimately inhibiting low-temperature corrosion. At the same time, the presence of magnesium oxide makes the type of vanadate generated by combustion change from low melting point to a high melting point, which alleviates high-temperature corrosion.

Abstract:In order to optimize the non-homogeneity of the reservoir to improve the effectiveness of acidizing operations, a self-assembled acidizing steering polymer named AHD, was synthesized in this study. Acrylamide (AM), sulfonate monomer (HSY) and octadecyl dimethyl allyl ammonium chloride (DMAAC-18) were used as functional monomers to obtain polymer AHD, which was characterized by FTIR and GPC. AHD could form steering acid system with trimethylstearylammonium chloride（STAC） by self-assembly. The viscosity of this system could increase from 3 mPa·s to 288 mPa·s without crosslinking agent when the addition of AHD and STAC was 1.0 % and 0.2 % (based on the total mass of HCl solution) at 90 ℃. Fresh acid was easier to introduce into the formatio because it had a lower viscosity than the non-crosslinked polymer steering acid’s viscosity. With 1.0 % oil addition, the viscosity of the spent acid after gel breaking was less than 10 mPas, maintaining the benefit of viscoelastic surfactant steering acid could gel break automatically in the situation of oil for backflow. According to the mechanism of the TEM and DLS investigations, Ca2+ encouraged the development of bigger aggregates in the surfactant-polymer self-assembly system, which allowed the steering acid to be diverted.

Abstract:Abstract: α-zirconium phosphate (α-ZrP) as synergist was combined with piperazine-modified ammonium polyphosphate (Pa-APP)/pentaerythritol (PER) intumescent flame retardants to overcome the flammability and melt dropping issues of polyacrylate. The optimal addition ratio was explored through orthogonal experiments. The results show that Pa-APP/PER/α-ZrP has a prominent synergistic flame retardant effect with 25% total addition, Pa-APP:PER=9:2 and 2% α-ZrP, the maximal LOI of polyacrylate composite reached 30.4%, UL-94 achieved V-1, and the peak heat release rate (PHRR) and total heat release (THR) reduced by 75.9% and 39.4%, respectively. In addition, the morphology and composition of carbon residue were analyzed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and fourier transform infrared spectrum (FT-IR),the system improved the weight and quality of carbon layer of polyacrylate, which effectively inhibited the droplet and smoke generation, significantly improved the fire safety of polycrylate.

Abstract:To explore the catalytic synthesis process of chlorchalcone and its flavones with different substitutions using paeonol as precursor, and to explore a new way to synthesize chlorchalcone and its flavones. ChalconeⅠ, Ⅱ and Ⅲ were synthesized by paeonol and chlorobenzaldehyde catalyzed by Clason-Smit reaction base, and then the chlorobenzone Ⅳ, Ⅴ and Ⅵ were synthesized by iodine catalytic cycloclosure of the three chalcone respectively. ₁^{H NMR,} ₁₃^{CNMR, 135°DEPT, FTIR} and UV and fluorescence properties of the products were tested. The yield of chlorinated flavonoids Ⅳ, Ⅴ and Ⅵ were 88.6%, 87.7% and 86.1%, respectively. The fluorescence intensity at the fluorescence peak (λ_ex/ λ_EM) 220/415 nm was 400, 500 and 600, respectively. The synthesis of chalcone Ⅰ is the key step. Taking the synthesis of chalcone Ⅰ as an example, the effects of single factors such as base, temperature and solvent on the yield of chalcone were investigated, and the synthesis process conditions were optimized by response surface method. With benzaldehyde dosage of 3.6 mmol, paeonol 3 mmol, ethanol 15 mL, NaOH 0.239 g and reflux at 70 ℃ for 10 h, the yield of chalcone Ⅰ was up to 93.7%. Under the same conditions, the yield of chalcone Ⅱ and chalcone Ⅲ was 92.3% and 92.1%, respectively. The synthesis process of chlorinated chalcone and flavone is simple, green and environmentally friendly, and can achieve