Abstract:CuMgLa/Al2O3 was prepared from Cu(NO3)2•3H2O by coprecipitation method and characterized by TEM and N2 adsorption-desorption technique. The results showed that CuMgLa/Al2O3 had a mesoporous structure and the particle size of the main active component CuO was about 25 nm. The effects of temperature and catalyst mass concentration on the degradation of quinoline by wet catalytic oxidation were investigated. It was found that under the conditions of mass concentration of quinoline simulated wastewater 1000 mg/L, catalyst mass concentration 0.2 g/L, reaction temperature 240 °C, oxygen partial pressure 0.53 MPa, reaction time 60 min, the removal rate of quinoline could reach about 100.0%, and the removal rate of chemical oxygen demand（COD）could reach 94.8%. The quenching experiments of tert-butanol revealed that ·OH oxidation played a key role in quinoline degradation. The intermediate of quinoline degradation was analyzed by LC-MS and UV-Vis, and the possible degradation path of quinoline was speculated. Meanwhile, under the optimal conditions, COD removal rate of 7000 mg/L mass concentration of simulated coking wastewater could reach 94.6%. The removal rates of COD and NH3-N were 69.6% and 28.0% for the actual coking wastewater with COD and NH3-N mass concentration of 4740 and of 884.2 mg/L.

Abstract:Chitin can be converted into a variety of high value-added products and chemicals. The latest research progress in the conversion of chitin and its degradation product of N-acetylglucosamine to nitrogen-containing chemicals such as 3-acetamido-5-acetylfuran and other N-containing compounds is reviewed. The further conversion of 3-acetamido-5-acetylfuran as a platform compound to other compounds is also summarizes. The research directions in these fields are prospected so as to promote the development of chitin conversion into nitrogen-containing chemicals.

Abstract:Polysaccharide is the most abundant natural polymer in nature. The molecular chains of polysaccharides are usually substituted by hydrophobic side groups, giving them a natural amphiphilicity. Therefore, it can be well adsorbed onto the multiphase interface, having the ability to improve the compatibility between solid-liquid and liquid-liquid phases. In addition, the unique physicochemical structure enables polysaccharides to have good rheological properties in water and have the ability to form gel networks, which can exhibit good interfacial adsorption ability under low surface activity, so they are often used for emulsifying, dispersing, thickening and stabilizing multiphase systems. The balancing of the hydrophilic-hydrophobic level of polysaccharides was obtained by appropriate chemical modifications, which also give them special surface properties making an excellent green macromolecular surfactant. Based on this, the article mainly introduces the application of naturally abundant polysaccharides in surfactants, mainly including cellulose, starch, hemicellulose, chitin, natural gum, etc. The effects of chemical structures and modifications of polysaccharides on their emulsifying, dispersing, demulsifying, solubilizing properties were analyzed; the research progress and application potential of polysaccharides and their derivatives in surfactants were described.

Abstract:Wittig reaction is one of the important reactions for synthesizing olefins, and it plays an important role in the field of fine organic synthesis with good stereo-selectivity and yield. But the mechanism and influencing factors are not clear. Scientists have developed the Wittig-Horner reaction and aza-Wittig reaction to make up for the deficiency of Wittig reaction. First, this article introduces structural design and synthesis by Wittig reaction in the form of extra-ring double bonds, alpha, α, β-unsaturated carbonyl compounds, conjugated polyene, heterocyclic compounds, etc. Then, Wittig reaction is reviewed in the fields of life science, medical pharmacy, agricultural production, functional materials and other fields. Finally, the development trend is forecasted.

Abstract:catalytic oxidation of formaldehyde (HCHO) has been considered as one of the most promising approaches because this process is environmentally friendly, energy-saving, simple operation and so on. In this paper, the active oxygen species, the possible intermediates and the reaction paths in the catalytic oxidation of HCHO have been summarized. And the main factors that influence the reaction mechanisms of catalytic HCHO oxidation over the noble metal catalysts (such as Au, Pt, Pd and Ag) and transition metal oxides (such as Mn, Co and Ce) have been reviewed in terms of the different metal species, carrier properties and additives. The reaction mechanism of commercial formaldehyde removal products was introduced. At last, the existing problems in the mechanism of catalytic oxidation of formaldehyde and the opportunities for future research were prospected.

Abstract:The kinetic process of single-phase metal catalysts for electrochemical hydrogen evolution in alkaline conditions is generally slower than that in acidic s conditions, and with problems such as corrosion. Recently, many heterostructure catalysts have demonstrated extraordinary electrocatalytic performance or long-term durability in alkaline conditions toward hydrogen evolution reaction (HER), particularly a number of precious-metal free heterostructures deliver comparable activity with precious-metal-based catalysts, providing new ideas for the design and exploration of HER catalysts under alkaline conditions. First, the advantages of heterostructures compared to single materials in hydrogen production catalysis are introduced, and the background of basic hydrogen production theory is added. Then, the research path of heterostructures in alkaline hydrogen production catalysts is traced, mainly introducing transition metal hydroxide-based, oxide-based and sulfide-based heterostructure catalysts. The preparation methods, characterization strategies and corresponding design ideas of heterostructure catalysts are demonstrated by examples. Finally, the difficulties of heterostructure catalysts in the comparison of intrinsic activity are analyzed and the future research of heterostructure catalyst mechanism is prospected.

Abstract:Mesoporous materials have unique pore structure, large specific surface area, adjustable pore size, dimensional order and other characteristics. Hence, they have broad application prospects in photochemistry, biological simulation, catalysis, separation, functional materials and so on. Based on this, this paper summarized the latest research progress in the preparation of mesoporous materials by template method. And the main factors that affect the pore size regulation and morphology change of mesoporous materials, such as the types of template agents, organic auxiliaries and reaction conditions, were reviewed. At last, the future development trend of the mesoporous materials was prospected.

Abstract:Cellulose acetate nanofiber membrane was fabricated by electrospinning technology, which was hydrolyzed to synthesize cellulose nanofiber membrane by lithium hydroxide. The as-obtained cellulose nanofiber membrane was modified to prepare the amphoteric cellulose nanofiber membrane by 3-chloro-2-hydroxypropyl trimethylammonium chloride and monochloroacetic acid. The UV spectrophotometer was utilized to evaluate the adsorption properties of alizarin green (AG25) and methylene blue (MB) on amphoteric cellulose nanofiber membrane and the effect of pH value, temperature and initial concentration of dye on adsorption was studied. The results presented that after modification, the adsorption properties of the amphoteric cellulose nanofiber membrane to AG25 and MB dyes were greatly improved. Especially, the maximum adsorption capacity reached 240 mg/g and 128 mg/g, respectively, and adsorption efficiency still maintain 84 % for the two dyes in the fourth cycle. Meanwhile, it was found that the pH value was the most critical factor affecting the dye adsorption property of the amphoteric cellulose nanofiber membrane. Before adsorption unsaturation of the amphoteric cellulose nanofiber membrane, the dye adsorption amount increased with the increased of the dye concentration and the adsorption effect had no dependence on temperature.

Abstract:Abstract: Coaxial co-flow capillary microreactors were designed and used to prepare fluorescent polymer dots (Pdots) using poly(9,9-dioctylfluorene-co-benzothiadiazole) (PFBT) as a polymer, tetrahydrofuran (THF) as a solvent, deionized water as an antisolvent, polystyrene - maleic anhydride copolymer (PSMA) as a stabilizer by a nanoprecipitation method. The size distributions of Pdots were measured by a dynamic light scattering (DLS) technique. The results showed that the sizes of polymer nanoparticles decreased as the microchannel diameters decreased in the range of 50 μm ~ 500 μm. For 1 μg/mL～50 μg/mL PFBT solutions, the sizes of polymer nanoparticles decreased with decreasing the mass concentration of the polymer. The diameters of polymer nanoparticles were reduced low to 14 nm using a 5 μg/mL PFBT solution at a flow ratio of deionized water to polymer solution of 40:1 in a microchannel with a diameter of 50 μm. The sizes and size distributions of nanoparticles were controlled accurately using the microfluidic technique presented here.

Abstract:A series of fluorine-containing waterborne polyurethanes (CC-FPUF) were synthesized based on triazine-based fluorinated chain extender (CC-F) prepared from cyanuric chloride (CC), Octafluoropentanol(OFP) and ethanolamine(MEA). The structure of CC-FPUF was characterized by FTIR and 1H NMR. Effect of the content of the CC-F in CC-FPUF preparation (based on the total quality of CC-F, IPDI, CMA-1044, DMPA, S104, TMP and TEA, the same below) on particle size of CC-FPUF emulsions, polymer crystalline form, morphology, surface element composition, hydrophobic properties and mechanical properties of CC-FPUF latex films was investigated in detail by DLS, XRD, XPS, SEM, WCA and electronic universal testing machine. The results showed that the latexes size, hydrophobic properties and tensile strength of the CC-FPUF films increased gradually with the increase of CC-F content. It is worth noting that when the content of CC-F reached 8% (CC-FPUF-8), the water contact angle on the CC-FPUF film reached up to 125.8°, which was increased by 60.9° and 34.1° respectively compared with the fluorine-free PU film and the CC-FPUF-0 (the content of CC-F is 0) film. Meanwhile, the tensile strength of the film was the largest and 24.47 MPa higher than the CC-FPUF-0 film. So, the CC-FPUF-8 film exhibits excellent hydrophobic properties and good mechanical properties.

Abstract:Due to its low price and availability, good hemostasis and biocompatibility, chitosan (CS) and its derivatives are widely used in the development of antibacterial and hemostatic materials. Alkylated chitosan (N-CS) was prepared by N-alkylation modification of CS with dodecanal and embedding N-CS into the polydopamine-modified graphene oxide (DGO) framework in acetic acid solution to prepare novel hemostatic powders (N-CS/DGO). The structure and morphology were characterized by FTIR, SEM and BET, which indicated that the surface of N-CS/DGO hemostatic powder contained a large number of active groups, and had excellent hydrophilicity, large specific surface area and rich pore structure. When DGO account for 15%, the composite power had the best potential for hemostasis. At this time, the material could absorb water by 430% over itself , and the degradation ratio was appropriate, reaching 88% in five weeks. The inhibition zones for E. coli and S. aureus were 1.92 mm and 1.98 mm, respectively. With certain bacteriostatic ability, the coagulation index could reach its minimum, that was 32%, and the in vitro coagulation time was shortened to 126± 6 s, all of which indicated that N-CS / DGO materials had potential for hemostasis.

Abstract:A fluorescent molecular probe (L) based quinoline schiff base was synthesized by the condensation reaction of 8-hydroxyquinoline-2-carboxaldehyde and salicylhydrazide. The molecular structure of the probe L was determined by FT-IR, 1H NMR, 13C NMR and ESI-MS. The recognition performance of probe L was studied by absorption and fluorescence spectra in DMSO solution. The probe L and Fe3+ could form a 1: 1 complex L-Fe, which binding constant is 4.6*104 L/mol. Through the quenching of probe fluorescence caused by the formation of the above complexes, Fe3+ could be selectively recognized in common metal ions, and the detection limit is 6.8* 10-8 mol/L. Furthermore, the L-Fe complex was used as a probe to achieve highly selective fluorescence enhanced recognition of oxalic acid, and the detection limit is 1.3*10-7 mol/L. This method could be used to detect oxalic acid in vegetables samples.

Abstract:The synergistic inhibition ratio of glabridin and oxyresveratrol to tyrosinase was optimized by in vitro tyrosinase inhibition experiments and response surface method. The micelle solution of glabridin and oxyresveratrol was prepared according to the optimum activity ratio, and the model mice with chloasma was replicated by medium-wave ultraviolet irradiationUVB radiation. After the micelle solution treatment, the superoxide dismutase and malondialdehyde in the serum and skin tissues of the mice were detected. The results showed that the optimal ratio of glabridin and oxyresveratrol was predicted to be 0.012∶0.020 (mol/L∶mol/L). Glabridin micelle solution,oxyresveratrol micelle solution and glabridin oxyresveratrol compound micelle solution all reduced lipid peroxidation in skin tissue and serum of mice with chloasma, and increased superoxide dismutase activity, compared with model group, superoxide dismutase activity in serum of glabridin oxyresveratrol compound group increased by 24.71 U/mL, malondialdehyde content decreased by 7.90 U/mL; superoxide dismutase activity in skin tissue increased by 15.14 U/mgprot, malondialdehyde content decreased by 1.60 U/mgprot, show thatand glabridin oxyresveratrol compound micelle solution had the best effect. Glabridin and oxyresveratrol have protective effect on the formation of chloasma, and the two have synergistic effect which works better when combined.

Abstract:A series of samples were prepared by treating HY zeolites with NH3 under high temperature. Their structures, acidity and basicity as well as the coke contents after reaction were systematically characterized by means of XRD, elemental analysis, 29Si MAS NMR, NH3-TPD, CO2-TPD and TG techniques. Their catalytic performances in the formaldehyde–isobutene Prins condensation were evaluated. The effects of samples nitridated under different atmosphere and reaction conditions were investigated in details. It is found that the selectivity of 3-methyl-3-buten-1-ol (MBO) increases to 89% and its yield is up to 82% on catalyst nitridated with NH3 containing 5% water under the optimized reaction temperature of 230 ℃ and reaction time of 4 h. Moreover, the coke contents decrease obviously from 27% on HY zeolite to 4.3% on nitridated sample after reaction. The acidity and basicity characterizations of the samples indicate that treating HY zeolites with NH3 leads to the decrease of the acidic sites and increase of the medium-strong basic sites, which inhibits the side reactions and enhances MBO selectivity. Meanwhile, the coke content decreases obviously on the nitridated sample due to its fewer acid sites and appropriate amount of basic sites.

Abstract:A case of Cu-based metal-organic macrocycle, 〔[Cu2(DCT)2Br2]·1.6(C3H7NO)·1.6(CH3OH) 〕(CuBr-DCT), is constructed from thiourea–groups-containing carbazole-based ligands DCT 〔2,2'-((9-butyl-9H-carbazole-3,6-diyl)bis(methanylylidene))bis(hydrazine-1-carbothioamide)〕and characterized by single-crystal X-ray diffraction and Solid-state UV-Vis absorption spectra. CuBr-DCT shows good photochemical physical properties and can be used as a heterogeneous catalyst with excellent performance for copper-catalyzed azide-alkyne cycloaddition (CuAAC). The reaction system is composed of azide, alkyne, triethylamine (electron donor) and catalyst. As a heterogeneous catalyst, metal-organic macrocycle (CuBr-DCT) is easy to separate and recycle after the reaction, and can avoid the disproportionation or oxidation reaction of Cu(I) salt in the reaction process. CuBr-DCT exhibits excellent catalytic effect on CuAAC. Under room temperature and the irradiation of household energy-saving lamps, conversion rate is up to 100%, with no other by-products.

Abstract:SBA-15 mesoporous molecular sieve was prepared with the microcrystalline cellulose (MCC) as an auxiliary template, and then Ni/SBA-15-MCC hydrodearomatization catalyst was prepared with SBA-15-MCC mesoporous sieve as a support. The catalyst was characterized with XRD, N2 adsorption-desorption, FTIR, XPS, H2-TPR and SEM. The catalytic performance of the catalyst was evaluated on a fixed bed micro-reactor, with the dodecane solution of naphthalene as the model fuel. The results show of that Ni/SBA-15-MCC had the larger pore diameter and the higher mesopore order than Ni/SBA-15 without MCC. The residual carbon group on the surface of Ni/SBA-15-MCC reduce the interaction between NiO and support. Such changes are beneficial to reduce the diffusion resistance of the reaction, NiO dispersion and reduction and ease the competitive adsorption of between naphthalene and tetrahydronaphthalene, thus the catalytic activity and selectivity were improved. Under the conditions of reaction, pressure 3 MPa, temperature 280 ℃, volume ratio of hydrogen to oil 360 and mass space velocity 2.5 h-1, the naphthalene conversion on Ni/SBA-15-MCC closed to 100%, and the decalin selectivity was 98.8%, compared with Ni/SBA-15, they were increased by 6% and 10% respectively.

Abstract:Through the surface response method, based on the Box-Behnken test principle, a three-factor test was carried out on non-catalytic pyrolysis of biomass (corn straw), which the bio-oil yield is the response value, and the temperature, heating rate and nitrogen flow rate are independent variables. Process parameters to determine the maximum bio-oil yield for catalytic pyrolysis. Using tetraethyl silicate as the silicon source, a composite catalyst ZSM-5/SBA-15 was synthesized by post-synthesis method, and the microwave catalytic pyrolysis product analysis of corn straw was carried out. The catalysts were characterized by XRD, SEM, TEM, NH3-TPD, and draw conclusions the composite catalyst not only had the properties of mesoporous catalyst SBA-15, but also had the properties of microporous catalyst ZSM-5. Through GC-MS analysis, the addition of the composite catalyst ZSM-5/SBA-15 increased the content of hydrocarbon (6.42%) and phenol (39.65%) compared with that of non-catalytic pyrolysis.

Abstract:A series of Brønsted-Lewis acidic ionic liquids were synthesized by homotaurine, ZnCl2 and HCl as the raw meterial. The cation of the ionic liquids can provide Brønsted acid and the anion can provide Lewis acid. The ionic liquids were characterized by FTIR, 1HNMR, 13CNMR and EA. The Brønsted acidity, Lewis acidity and corrosiveness of the ionic liquids were tested. The ionic liquids were used as the catalysts synthesizing n-butyl acetate and the optimal conditions was explored by response surface method. The results showed that the temperature is 103℃, the amounts of the catalyst is 10.03% of the mass of n-butanol, n(acetic acid)∶n(n-butanol)=1∶1.22, the reaction time is 4.92h, the amounts of cyclohexane is 20% of the mass of n-butanol, the yield can reach 97.28%. Furthermore, [NH3C3H6SO3H]Cl/0.75ZnCl2 was reused for 5 times, and it still had high catalytic activity.

Abstract:Abstract: Molecular docking of 2-[(6-methoxyquinazolin-2-yl)amino]-6-{[(1-phenyl-1H-tetrazol-5-yl)thio]methyl}pyrimidin-4-(3H)-one (DCE-254) was carried out and 14 analogues were designed and synthesized. Analogues Ⅴa~Ⅵh were synthesized using ethyl 4-chloroacetoacetate and 1-phenyl-5-mercaptotetrazole, guanidine hydrochloride, substituted benzoyl chloride and substituted isothiocyanate and so on as raw materials. These compounds were characterized by MS and 1HNMR. Five kinds of DCE-254 analogues with strong methylation inhibition were obtained by the radioactive methylation inhibition assay of H3K27me. Among them, 1-(2-methoxy-5-methylphenyl)-3-(6-oxo-4-{[(1-phenyl-1H-tetrazol-5-yl)thio]methyl}-1,6-dihydropyrimidin-2-ylthiourea (Ⅵf) showed the most active, and the inhibition rate was 77%, which was better than that of DCE-254. Key words: EZH2 methyltransferase; methylation inhibitor; antitumor activities; drug and cosmetic materials

Abstract:Phospholipid-chitosan self-assembled nanoparticles were prepared to embed nuciferine to improve its stability. The encapsulation rate was used as the index to explore the best preparation process. At the same time, the storage stability, digestion stability and in vitro release characteristics of the nanoparticles were evaluated. The results showed that under the original solvent injection method, the encapsulation rate was found to be only 20.08%. Using the modified solvent injection method, it was found that the maximum encapsulation rate was 51.13% when the water-soluble vitamin E with a mass fraction of 2% was added to the chitosan aqueous phase. At this time, the average particle size of the nanoparticles was 142.23nm, the potential was + 24.57mV, and the appearance was similar to a spherical shape. Self-assembled nanoparticles can significantly improve the storage stability of nuciferine (p <0.05), and the half-life of nuciferine at room temperature (25 ℃) was increased from 36.2d to 53.1d, and at low temperature (4 ℃) was increased from 56.2d to 86.2d. The self-assembled nanoparticles increased the retention rate of nuciferine after gastrointestinal digestion from 20.29% to 82.98% in the digestion stability experiment, and showed a certain sustained release in the in vitro simulated release experiment.

Abstract:In order to alleviate Si volume expansion and achieve the improvement electrochemical properties , we have successfully prepared a multiphase Si-MgO-G composite material using Mg, SiO and graphite as raw materials. The effects of different high energy ball milling processes on the reaction degree of Mg and SiO were studied, and application of thick electrode forming technology was discussed in this paper. Researches showed that after high-energy ball milling for (1+5) h the in-situ redox reaction of Mg and SiO was fully completed to generate (Si+MgO) product. The reaction product was then mixed with Graphite to prepare multiphase Si-MgO-G composite materials. A combination of XRD, SEM, TEM, CV, and EIS was employed to study phase constitution, morphology and nanostructure, as well as electrochemical properties of the prepared silicon-based anode composite materials. It has been confirmed that the prepared SMG anode composite material was mainly composed of Si, MgO, graphite, and there existed an interface coherent relationship of Si(220)//MgO(200). The results show that the SMG-6h thick electrode was fabricated by kneading and open milling process, and the thickness and load of thick electrode were about 7.4 times and 6.0 times as compared to thin electrode. The corresponding area specific capacity of thick electrode was 6.2 times. This process demonstrates that thick electrode technique can be used to increase area specific capacity for Li-ion batteries through a simple, green and scalable route.

Abstract:A series of epoxy resins were synthesized with poly (1,4-butanediol adipate) polyol (PBA), isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), 1,4-butanediol (BDO), hydroxypropyl terminated poly (dimethylsiloxane) (PDMS) and epoxy resin (E-51) as monomers, triethylamine (tea) as neutralizer and ethylene diamine (EDA) as post chain extender Modified silicone containing self extinction waterborne polyurethane resin emulsion. Particle size analyzer was used to measure the particle size of the emulsion, FTIR to characterize the surface structure of the film, SEM to observe the surface of the film, and the properties such as gloss, water contact angle and thermodynamics of the film were analyzed. The results show that under the condition of n (PBA): n (PDMS) =1:2, When the mass fraction of E-51 is 5 %, the emulsion size is 1152 nm, the 60? gloss of the film is 3.4, the water contact angle is 107.3?, the tensile strength is 24.42 MPa, the elongation at break is 362 %, the thermal decomposition temperature at 50 % mass loss rate, compared with the unmodified polyurethane film, is increased by 18.3 ℃ ．

Abstract:Chemical immobilization experiment of nuclide uranium in uranium tailings pond with nano-zeolite, potassium dihydrogen phosphate and modified biochar combined, the leaching features and morphological changes of uranium before and after immobilization was determined by toxicity characteristic leaching procedure (TCLP) and stepwise chemical extraction.TCLP results showed that after 30 days of immobilization with different stabilizers, the amount of uranium leaching from soil decreased by 42.13%~71.54% compared with the control group.Moreover,there was a significant negative correlation between soil pH and TCLP-extracted uranium content.Tessier results showed that the mass fraction of exchangeable and carbonate-bound uranium in soil decreased by 7.38%~26.06%, 1.43%~6.99% with different fixatives, while the organic-bound, Fe-Mn oxide-bound and residual uranium increased by 2.56%~3.64%,2.71%~17.47%, 4.07%~11.12% respectively. In the single fixed material experiment, the application of nano-zeolite with 6% soil mass fraction has the best stability effect,the proportion of exchangeable uranium in soil decreased by 15.68%.In the compound materials experiment, the best repair effect was obtained by adding three fixatives with a mass ratio of 1:1:1 and a total dosage of 6%,the proportion of exchangeable uranium in soil decreased by 26.06%.Therefore,the application of three fixatives combined can effectively reduce the activity of uranium in soil,to provide theoretical reference for the remediation of other radioactive contaminated soils.

Abstract:Tris(4-iodophenyl)amine (TITPA) was synthesized using triphenylamine as raw material through electrophilic substitution reaction. Subsequently, a classic Arbuzov rearrangement reaction between intermediate TITPA and trimethyl phosphite was performed in a catalytic amount of Pd(PPh3)2Cl2 to obtain hexamethyl [nitrilotris(benzene-4,1-diyl)]tris(phosphonate) (TPTPA). The target product was characterized by 1HNMR、13CNMR、31PNMR、HR-MS and elemental analysis. The effects of catalyst type, catalyst dosage , reaction temperature and reaction time on the yield of the target compound were investigated. The results showed that the optimum conditions were obtained as follows: n(Pd(PPh3)2Cl2)∶n(TITPA) = 0.18∶1.00, reaction temperature of 150 ℃, reaction time of 5 h. Under these conditions, the yield of hexamethyl [nitrilotris(benzene-4,1-diyl)]tris(phosphonate) could reach 82.5%. Subsequently, TPTPA as a flame retardant was used for flame retardant modification of PVC. The results indicated that the prepared sample with an additive amount of TPTPA of 10% (based on the mass of PVC resin, the same below) had limited oxygen index of 29.6% and vertical combustion test of UL94 up to V-0 level as well as maintained excellent mechanical properties.

Abstract:The carrageenan-based flame retardant(KC-FR) was prepared by reverse emulsion polymerization, using carrageenan (KC) as shell material, ammonium polyphosphate (APP) and manganese dioxide (MnO2) as core material. KC-FR was characterized by FTIR, XRD, SEM and EDS. It was proved that carrageenan successfully coated APP and MnO2, and it has microsphere structure. The effects of different KC, APP and MnO2 ratios on the flame retardant and smoke suppression properties of waterborne epoxy resin were investigated. The flame retardancy and smoke suppression of the coating were characterized by limit oxygen index (LOI), vertical combustion (UL-94) and cone calorimetry (CCT). The results showed that the limiting oxygen index (LOI) of EP increased from 19.7% to 29.1%, when the ratio of KC, APP and MnO2 were 2:1:1(flame retardant coating EP2), and UL-94 level reached V-0 level, which indicated good flame retardancy properties. At the same time, comparing with EP0, the peak heat release (pHRR), total heat release (THR) and the total smoke production (TSP)of EP2 coating decreased by 42%, 37% and 46%, respectively, which indicated good smoke suppression properties. In addition, the carbon residue was 33% using thermogravimetric analysis(TGA), which indicated the content of KC in KC-FR was the key to the amount of carbon residue. Analysis of the carbon layer using SEM and elemental analysis (EDS) indicated that the surface carbon layer was more compact of EP2, which indicated the KC-FR played an important role in formation of stable and dense carbon layer.

Abstract:Ultrasonic oxidation stripping method was applied to preparation graphene oxide (GO). The cotton fabrics padding with GO, then drying the GO padded cotton fabrics, finally the reduced graphene oxide (RGO) coated electric conductive cotton fabrics was obtained by chemical reduction. The influence of GO concentration, pH value, reduction condition, padding-reduction times on electrical conductivity of cotton fabrics was researched. The cotton samples were characterized by SEM and Raman spectra. The washing fastness of the samples was also tested. The results showed that the optimal conductive finishing process, GO 2.5 g/L, pH value of GO solution was controlled about 6, sodium hydrosulfite 5g/L, reduced at 95℃ for 30 min, the surface electric resistance of cotton after 1, 4 and 8 times of padding-reduction process was decreased to 2220 Ω, 270 Ω and 130 Ω, respectively. The SEM results showed that after padding with GO, GO forms a thin film on the surface of the fabric. The Raman results showed that the GO was deposition on the surface of cotton fabrics, and the GO fully reduced to RGO. The result of washable property of electric conductive cotton fabric was found that the conductive durability of the treated fabric is excellent.

Abstract:The SiO2 coated aluminum pigment was prepared by sol-gel reaction using tetraethyl orthosilicate as the silicon source firstly, then the blue aluminum pigment and the red aluminum pigment with metallic luster was prepared respectively by the organic pigment of phthalocyanine blue or azo red precipitated on the surface of SiO2 film, by using BaCl2·2H2O as precipitant. FE-SEM, contact angle and alkali resistance test was used to test the properties of SiO2 coated aluminum pigment and inorganic-organic double-layer coated color aluminum pigment. The results showed that SiO2 formed a uniform and dense hydrophilic coating layer on the surface of aluminum pigment. The contact angle between the organic-inorganic double-layer coating color aluminum pigment and water increased from 23.2 ° to 80 °, and the hydrophobicity increased. In the weak alkaline environment of 40 ℃ and pH = 9, the hydrogen release amount of SiO2 coated aluminum pigment was less than 6 mL and the color aluminum pigment was less than 30 mL within 48 h, and then both of them tended to be stable. The color card comparison and multi angle color difference analyzer result showed that the prepared inorganic-organic double-layer coating color aluminum pigment had obvious color with angle property. The color saturation of red aluminum pigment was higher than that of blue aluminum pigment, and with the increase of phthalocyanine blue raw material, the color saturation of blue aluminum pigment increases, but the effect on brightness is not significant.

Abstract:The change of composition during the thermal treatment of Zn(OAc)2·2H2O was analyzed by TG, FTIR and XRD characterization. At the thermal treatment temperature of 100 ℃ within 8 h, only dehydration process of Zn(OAc)2·2H2O occurred. After the thermal treatment at 120 ℃ for 4 h, Zn4O(OAc)6 was formed and its amount increased as the time of thermal treatment extended. ZnO was formed after the thermal treatment at 160 ℃ for 6 h, and most of the products were ZnO after 12 h. The products of Zn(OAc)2·2H2O under different thermal treatment conditions were used for the synthesis of 2,4-toluene dicarbamate (2,4-TDC).At the reaction temperature of 160 ℃, the yield of 2,4-TDC catalyzed by Zn(OAc)2·2H2O under the heat treatment at 100 ℃ for 8 h reached 88.1%, indicating that the catalytic activity of Zn(OAc)2 was higher at 160 ℃. When the reaction temperature reached 180 ℃, the yield of 2,4-TDC catalyzed by Zn(OAc)2·2H2O under the heat treatment at 140 ℃ for 8 h was 92.8%, showing that Zn4O(OAc)6 had a higher catalytic activity at 180 ℃.

Abstract:With dibromohydantoin and dichlorohydantoin as halogen sources, 18 (halogenated phenyl)(pyridin-2-yl) methanones were prepared by Pd(OAc)2 catalyzed C—H halogenation from (substituted phenyl)(pyridine-2-yl) methanones in 1,2-dichloroethane. Their structures were determined by 1HNMR and 13CNMR. A range of (halogenated phenyl)(pyridin-2-yl) methanones with wide functional group tolerance was obtained in moderate to good yields. Furthermore, the results indicate that the halogenation ability of dibromohydantoin is higher than dichlorohydantoin. In addition, a possible reaction pathway was proposed as a C–H bond activation-halogenation process based on the results of control experiments.

Abstract:Phenyl-2-pyridinyl methanol，as a key pharmacological intermediate, was synthesized via an “one-pot three-steps” method with 2-benzylpyridine nitrogen-oxide and trifluoroacetic anhydride as starting materials, which involved tandem acylation, [3,3]-sigmatropic rearrangement and hydrolysis reaction. The reaction conditions were investigated and the optimal conditions were obtained as follows: trifluoroacetic anhydride was as acylating agent in 1.2 equivalent, N, N-diisopropylethylamine (DIPEA) was as base and the mixture was stirred in toluene for 6 h at room temperature. The phenyl-2-pyridinyl methanol was obtained by silica gel column chromatography with the yield of 81.0%, and the structures of all products were confirmed by 1H NMR，13C NMR and HRMS. This reaction firstly achieved the direct transformation from 2-benzylpyridine nitrogen-oxide to phenyl-2-pyridyl methanol in an atomic economic manner.