Abstract:A new phosphorus-nitrogen flame retardant GAP – DOPO was prepared with 3-aminophenol, glutaraldehyde and DOPO as raw materials. The infrared, nuclear magnetic and TGA were employed to character the structure and thermal properties of the flame retardant. The GAP - DOPO for flame retardant epoxy resin, the TGA, SEM and Vertical combustion tester were employed to character the thermal properties, structure of carbon residue and the UL-94 of flame retardant epoxy resin; Through the above analysis, when addition 30wt % GSP - DOPO into EP, the UL-94 test was V-0; the TGA show that the carbon residue rate can be increased from 16.3% to 21.5% at 800 ℃ (N2 atmosphere), improved 31.9%; And SEM shows that the addition of flame retardant can obviously change the carbon residue morphology after combustion, increases the flame retardant properties of composite materials.

Abstract:In order to understand the effect of the varying the carbon chain length of the initial resin on curing kinetics and the final properties of the cured products, two resins both contained binaphthalene units were synthesized and characterized by means of 1HNMR and EA. Both epoxy resins were cured with 4,4'-diaminodiphenylmethane (DDM) and their kinetic analyses were performed by Ozawa’s isoconversional method. The activation energy (Ea) of R1/DDM and R2/DDM curing system was 42.34kJ/mol and 56.88kJ/mol. The results indicated that the activation energy (Ea) of the R1/DDM increased while R2/DDM decreased slightly with the increased of the conversion rate (α). The influence of different carbon chain length on the thermal properties, Tg, mechanical property and moisture absorption of the cured epoxy resins was investigated. The results showed that with the increase of the length of carbon chain from C2 to C8, the initial decomposition temperature decrease from 220.3℃ to 210.5℃, the carbon residue rate at 800℃ increase from 3.45% to 6.77%, the Tg increase from 135℃ to 141℃, the elongation at break from 6.7% to 4.3%, and the water absorption decreased from 0.35% to 0.28%.

Abstract:Polysulfone microcapsules containing lubricating oil were successfully prepared using solvent evaporation method. The effect of the mass ratio of lubricating oil and polysulfone on the core content and wall thickness of microcapsules were discussed. The synthesized microcapsules have excellent thermal stability, with a thermal degradation onset temperature of 240℃. The mean diameter and wall thickness were approximately 130 μm and 5 μm, respectively. The encapsulation capacity of about 53.25% was achieved. The self-lubricating composites were prepared by incorporating the microcapsules into LLDPE, and the tribological properties and the self-lubricating mechanism of the composites were studied. When the concentration of the lubricating oil microcapsules was 20%. The frictional coefficient and wear rate of self-lubricating composite were reduced by 24.8% and 65.3%, respectively, as compared to the pure LLDPE.

Abstract:Poly(2,2-dimethyltrimethylene carbonate)(CA-PDTC) was synthesized through ring-opening polymerization of 2,2-dimethyltrimethylene carbonate (DTC) initiated by cetyl alcohol(CA). Folate-modified polycarbonate (CA-PDTC-FA) was synthesized via esterification reaction of CA-PDTC with folate. The structures of CA-PDTC and CA-PDTC-FA were confirmed by FTIR, 1HNMR and UV-vis. Folate-modified polycarbonate magnetic drug-loaded microspheres(CA-PDTC-FA@Fe3O4) were prepared with emulsification method, using indomethacin (IMC) as a model drug and Fe3O4 as magnetic source. X-ray powder diffraction (XRD), thermogravimetric analysis(TG), dynamic light scattering (DLS) and vibrating sample magnetometer (VSM) were used to characterize the obtained microspheres. The results showed that the mass fraction of Fe3O4 wrapped in polycarbonate microspheres was 9.5%, and that the size of microspheres was about 320 nm. Magnetic property measurement indicated that the micropheres had superparamagnetism and their saturated magnetization was 0.54emu/g. Besides, IMC with the mass percentage of 9.1% could be loaded in CA-PDTC-FA@Fe3O4 microspheres. The cumulatively released content of IMC from micropheres in PBS (pH=7.4，37℃) was 20.0% after 36 h, the result showed that the resultant microspheres had the sustained release effect for IMC.

Abstract:The rheological behavior of the first to the fifth generation of hydroxyl-terminated aliphatic hyperbranched polyesters and their binary blends consisting of two generations of hyperbranched polyesters with a weight ratio of unity were studied by rotational rheometer. The results showed that the second to the fifth generation of hydroxyl-terminated hyperbranched polyesters showed Newtonian fluid behavior in both steady shear and oscillatory shear conditions after eliminating thermal history. The Cox-Merz rule was found to be obeyed by the third to the fifth generation of hydroxyl-terminated hyperbranched polyesters. Due to the stronger ability of crystallization, the second generation of hydroxyl-terminated hyperbranched polyester showed shear-thickening behavior at high frequency region of oscillatory shear pattern while increasing temperature under the condition of exerting oscillation shear force within a small amplitude. The binary blends consisting of two generations of hyperbranched polyesters with a weight ratio of unity showed only Newtonian characteristics in both steady shear and oscillatory shear conditions if at least one of the components was Newtonian. The higher generation component dictated the flow characteristics of the binary blends and the lower generation portion affected the viscosity.

Abstract:Polyaniline(PANI) grafting SiO2(SiO2@PANI) sol was synthesized with aniline and SiO2 which modified by (3-glycidoxypropyl)-trimethoxylsilane(GPTMS), and prepared SiO2@PANI/VTMS composite sol after in situ embedding with vinyl trimethoxysilane(VTMS). The effects of reaction temperature and initiator dosage on the dispersion stability, particle size, contact angle and corrosion resistance of SiO2@PANI and coatings were discussed. The structure and morphology of SiO2@PANI were characterize by Fourier transform infrared spectrum(FT-IR), scanning electron microscopy(SEM), and so on. The results showed that it is favorable for aniline to polymerize homogeneously on the surface of SiO2 by the reaction between the amino group and epoxy group, and obtained core-shell type SiO2@PANI sol with SiO2 as core and PANI as shell. The SiO2@PANI sol has good dispersion stability in water and conductivity. The SiO2@PANI/VTMS composite sol prepared by SiO2@PANI could form hydrophobic coatings by coat it on the surface of magnesium-lithium (Mg-Li) alloy directly. The coatings have a high hydrophobic contact angle which reached 135.7°, and have excellent corrosion resistance performance to Mg-Li alloy which the electrochemical impedance value is 2.5×104 Ω•cm2 and the corrosion current density is merely 7.51×10-7 A/cm2.

Abstract:Nano-size CuFeO2 was prepared with chemical coprecipitation method and its nanoparticles were characterized by scanning electron microscopy/ energy disperse spectroscopy (SEM/EDS), X-ray diffraction (XRD), Fourier transform infrared (FT-IＲ) and BET analysis. The results show that the size of CuFeO2 synthesized is about 20 nm and its specific area is 258.3 m2/g. The adsorption of methylene blue (MB) is a pseudo second-rate kinetic process and reaches equilibrium in 40 min，in good agreement with the Langmuir adsorption model. CuFeO2 has good adsorption ability and its maximum adsorption capacity reaches 123.0 mg/g at room temperature and pH = 7. CuFeO2 can be used as adsorption material with high capacity for effective removal of methylene blue from waste water.

Abstract:In this paper, melamine (MEL) - formaldehyde resin (VMF) microcapsules were modified by polyvinyl alcohol (PVA) through in situ polymerization. Then the poly ammonium polyphosphate (APP) / mesoporous molecular sieve MCM-41 were coated by the prepared material, and thus a kind of flame retardant (MVMF-(A/M))with novel core-shell structure was prepared. The structure before and after microencapsulating was characterized by infrared spectrum analysis (IR), solubility test and electron microscope scanning (SEM). In addition, the flame retardant was added into natural rubber (NR) and the flame retardancy and mechanical properties of NR composites were tested by oxygen index (LOI), vertical burning test (UL-94), thermal gravimetric analysis (TGA), tensile test. The results showed that the solubility of prepared MVMF- (A/M) is 1.59mg /L in 20 ℃ water, was decreased by 51.2% compared with APP. Meanwhile, MVMF- (A/M) particle surface became rough; compared with other flame retardant system, the limited oxygen index value of the limited oxygen index value of NR- MVMF- (A/M) composites to be maximized, samples could pass the V-0 rating in the UL-94 tests; the tensile strength of samples reached 8.84MPa and its elongation at break reached 310.20%.

Abstract:A novel Gemini-surfactant type small cationic shale inhibitor: N1, N2-didodecyl-N1, N1, N2, N2-tetra (2-hydroxyethyl)-dibromoethane diammonium (Gemini-DHEDB), was prepared with diethanolamine, bromododecane and dibromoethane by Two–Step Method. Linear expansion tests, rolling recycling tests and sedimentation stability analysis tests were utilized to study its inhibition property, respectively. Results showed that the linear expansion height of sodium montmorillonite (Na-MMT) and the shale rolling recovery rate of shale was were just 4.27 mm and 52% in Gemini-DHEDB solution (mass concentration of, 2g/L) after 16h. , which were superior to the results in 2g/L dimethyl diallyl ammonium chloride (10.62mm, 31%), 2g/L tetrabutyl ammonium bromide (9.41mm, 36%) and 2g/L 3-methyl-2-hydroxyethyl ammonium bromide solution (7.74mm, 41%).Meanwhile, the linear expansion height and shale rolling recovery of dimethyl diallyl ammonium chloride, tetrabutyl ammonium bromide and 3-methyl-2-hydroxyethyl ammonium bromide solution was 10.62mm (31%), 9.41mm (36%) and 7.74mm (41%), respectively. , In sedimentation stability analysis tests, the Completion sedimentation completion sedimentation time of fresh water based fluid was about 14 h and the final thickness of sedimentation is was 38mm, while upon the addition of Gemini-DHEDB, the sedimentation time was obviously reduced to 1.2 hours and final thickness was 1.2 h and 45 mm. The micro structures of sodium montmorillonite (Na-MMT) composites were characterized via FT-IR analysis, X-ray diffraction (XRD) and scanning Scanning Electron Microscopy (SEM). Characterizations demonstrated that the successful intercalation and adsorption of Gemini-DHEDB into the Na-MMT interlayer, and had changed the micro structures of Na-MMT and the successful incorporation of Gemini-DHEDB with Na-MMT.

Abstract:A resin was synthesized by suspension polymerization and applied to cementing cement. Lauryl methacrylate(LMA), styrene (St), hydroxyl ethyl methacrylate (HEMA) as the co-monomer, benzoyl peroxide (BPO) as initiator, polyvinyl alcohol (PVA) as dispersant, divinyl benzene (DVB) as crosslinking agent. Using orthogonal experimental method to research the monomer ratio, the dosage of dispersants, dosage of initiator, crosslinking agent and reaction temperature on the properties of the ternary copolymer resin oil absorption effect. The results show the optimum polymerization condition of the ternary copolymer are as follows：m(LMA):m(St):m(HEMA)=6:3:1、w(PVA)=2.5%、w(BPO)=1.0%、w(DVB)=0.5%、T=85℃,and the oil absorption rate of xylene is 12.78 g/g. Through the artificial joint, The resin was added to the slurry system and discussed the variation of cement compressive strength and permeability. The results show that after curing 30 days,The permeability decreases with the increase of resin, reduced to 0.25×10-3 μm2 at dosage of 0.8%, while the compressive strength increased with resin increases and then decreases, reaches the maximum value of 20.8 MPa at dosage of 2.0%, and the compressive strength of the recovery rate was 70.5%.

Abstract:Three kinds of sulfur-and phosphorus-free organic titanate(TAE) were synthesized via oleic acid and titanium isopropoxide. Their structures were characterized by infrared spectrum. The thermal oxidative stability of organic titanium compounds and the antioxidant synergistic properties of TAE and p,p’-dioctyldiphenylamine (DODPA) were evaluated by differential scanning calorimetry and rotating bomb oxidation test. The results show that TAE can not improve the antioxidant properties of Poly-α-olefin (PAO), when it was combined with DODPA, the initial oxidation temperature and oxidation induction time of PAO were enhanced significantly. Especially, when 0.25 %TAE was combined with 0.75 %DODPA, the oxidation induction time of PAO base oil can be increased by more than 6 times, which showed best synergistic antioxidation performances. Finally, synergy mechanism of the two additives was discussed by infrared spectrum analysis.

Abstract:The gel ink rheological property and dispersion stability of pigment were influenced by the type and steady adsorption capacity of thickener and dispersion resin，which matter the fit and unfit quality of gel ink. It was investigated that the adsorption quantity of thickener to the pigment particles affected the gel ink apparent viscosity and thixotropic value for different ratio of pigment to resin, then the rheological property and stability of gel ink under the composite alkali soluble thickeners and properly condition were studied. The results showed that there was a dynamic competitive adsorption between dispersion resin and thickener. And it also turned out that the fine rheological property and well stability of gel ink system could be realized when the adding quantity (mass fraction) of thickener ALCOGUARD 5800 and T-938 reached 0.4% and 1.0% for the ratio of pigment to resin (3:1).

Abstract:Friedel-Crafts acylation of arenes is an important method to prepare aromatic ketone compounds. Compared to the conventional homogeneous catalysts applied in this reaction, green and efficient solid acid catalysts always attract more attention at home and abroad. In this paper, the research progress of zeolites, heteropoly acids, solid super acids, metal oxides and metal-organic frameworks were summarized. In addition, considering the characteristics of the various reactions, purposeful designing the solid acid catalysts with adjustable acidity, stable structure and efficient activity for industrial-scale production is the prospective development direction of Friedel-Crafts acylation.

Abstract:Two kinds of benzylidene schiff base substituted phthalonitriles were prepared by 4-aminophthalonitrile, 4-methylbenzaldehyde and 4-methoxybenzaldehyde, using AlCl3/Et3N as catalyst. 2(3), 9(10), 16(17), 23(24)-tetra-[(4-methylbenzylidene)amino]zinc phthalocyanine(SPc) and 2(3), 9(10), 16(17), 23(24)-tetra-[(4-methoxylbenzylidene)amino]zinc phthalocyanine(SOPc) were synthesised on the basis of cyclotetramerization of benzylidene schiff base substituted phthalonitrile. The target compounds were fully characterized by Fourier Transform infrared spectroscopy, elemental analyses, 1HNMR, 13CNMR, UV–Vis spectroscopy and cyclic voltammetry. Compared with the unsubstituted zinc phthalocyanine the Q band of SPc and SOPc had red-shifted about 35 nm and 43 nm, had a weak absorption within the range between 450 nm and 600 nm. And the target compounds existed in a form of monomer in DMF solution at the range of 0.002~0.010 mmol/L mol/L. The redox behavior was studied by cyclic voltammetry, the SPc and SOPc had been found to have a low LUMO (-3.24 eV, -3.29eV) and a deep HOMO (-4.88 eV, -4.71 eV) energy level. The results indicated that the LUMO and HOMO energy level of target compounds matched with the energy level of nano-TiO2.

Abstract:Abstract: Synthesis of L -2-methyl-tryptophan by immobilized cells of tryptophan synthetase cells was investigated. Using glutaraldehyde as crosslinking agent, sodium alginate as embedding agent, and modified corn straw stalk cellulose as filling agent immobilize the genetic engineering bacteria with tryptophan synthetase. Synthesis of L-2-methyl-tryptophan by immobilized cells of tryptophan synthetase engineering bacteria was carried out by response surface method. The effect of fumaric acid concentration, pH and reaction temperature was investigated. The optimized preparation conditions were as follows: 10 g/L L-serine, 35ºC, pH 8.0, the concentration of L-2-methyl-tryptophan was 5.3 g/L. The bioconversion rate of L-serine reached 41.6%. The yield of L-2-methyl-tryptophan was 25.3%. The immobilized bacteria could be used continuously for 12 times. The immobilized cells of tryptophan synthetase engineering bacteria by modified corn straw stalk cellulose have good stability.

Abstract:The catalytic performances of a series of Cu compounds in the oxidative carbonylation of methanol to dimethyl carbonate (DMC) were investigated by employing the soft-hard acid-base principle, the ion radius rules and the substitution effect. It has been found that it is the most appropriate for the border base Br- to coordinate with a border acid CuII and a soft acid CuI, improving the insertion of CO to the CuII—OCH3 bond, which is the rate-limiting step in DMC synthesis. Among a series of Cu(5-R-phen)Br2 catalysts (R = 5-NH2, 5-CH3, H, 5-Cl or 5-NO2, phen = 1,10-phenanthroline), the methyl substituent with the爓eakly electron-donating爀ffect is the most beneficial to the activation of CO and the insertion of CO to the Cu-OCH3 bond, and Cu(5-CH3-phen)Br2 exhibits the highest activity. For Cu(R?-phen)Br2 (R? = 2-CH3, 4-CH3, 5-CH3, 2,9-dimethyl, 4,7-dimethyl, or 5,6-dimethyl), the activity of the catalyst containing the mono-methyl group is higher than that of the corresponding catalyst with two methyl groups; the steric hinder effect is outstanding with the methyl close to N atoms, and the more the number of the methyl is, the lower the activity of the catalyst is. When Cu(5-CH3-phen)Br2 with the highest activity was used as the catalyst under the conditions of total pressure 4.0 MPa, ratio of partial pressure of CO to O2 19:1, reaction temperature 130 癈 and concentration of the catalyst in methanol of 0.011mol 稬-1, the turnover number and selectivity for DMC were up to 67.2 and 96.9%, respectively.

Abstract:Hydrophobic Pt catalystsⅠwas prepared by vacuum impregnation-reduction with Al2O3 as carrier and H2PtCl6 as impregnation solution. With OTMS (n-octadecyltrimethoxysilane) as modifier, Hydrophobic catalystsⅡ, Ⅲ and Ⅳ were attained through changing the OTMS concentrations〔w（OTMS）=0.5% (based on the weight of toluene, the same below), 1.2% and 2%〕. The catalyst loadings of these four catalysts were 1.5% (based on the weight of Al2O3 carrier, the same below). The catalytic performances of H2-O2 recombination on conditions of dry, wet and water were studied. The catalysts were also characterized with XRD, FTIR, CA, SEM, BET and pulsed hydrogen-oxygen titration techniques. The results showed that, compared with catalystⅠwithout modified in OTMS solution, catalystⅡcan catalyze H2-O2 recombination more steadily on wet condition，and the H2 conversion is 96.25%. In the water phase, catalystsⅡ also has catalytic activity，but the H2 conversion decreases to 43.75% from 61.25% during the 40h-testing. Catalysts Ⅲ and Ⅳ can catalyze H2-O2 recombination steadily on wet and water conditions. The H2 conversion of catalysts Ⅲ and Ⅳ are 93.75%, 87.5% on wet condition and 76.25%, 63.75% on water condition. As the OTMS concentrations in the solution increase，the catalysts attain better hydrophobic performance, wet resistance and water resistance, but the specific surface area、Pt disparity and Pt active specific surface area decrease and then have effect on catalytic activity of these catalysts on dry, wet and water conditions.

Abstract:The aroma components of tobacco were extracted by supercritical fluid extraction technology from discarded tobacco. In study, we took the extraction yield, the content of carotenoids and major carotenoid degradation products as evaluation indicators.The influence of operation conditions such as entrainer species, the amount of entrainer, extraction temperature, extraction pressure and flow rate of CO2 were investigated. And the essential oils extracted with different entrainers were added into cigarettes as flavors, and sensory evaluation was conducted. The results showed that the most effective entrainer was 1, 2-propanediol. The essential oils extracted with it had better quality, and it effectively improved the taste, enhanced aroma quality, aroma quantity and reduced the irritancy of cigarette smoke. The optimum conditions were choosing 1,2-propanediol as entrainer with 10% by weight, extraction temperature of 40 ℃, extraction pressure of 25 MPa, CO2 flow rate of 2.0 L/min, extract time of 3 h.Under these conditions, the extraction yield was 18.74% and the extraction yield of the content of major carotenoid degradation products was 5.56%.

Abstract:The target compounds were obtained through amino protection, acylation, condensation, deprotection and salification of tenofovir as the starting material, eight compounds were synthesized(Ⅲa～Ⅲh). The effect of different alkaline reagents on the conversion of compound Ⅰ during the preparation of compound Ⅱ and ratio of acetic acid to prodrug parent was studied. The optimal conditions were as following: Triethylamine was selected as the alkaline reagent; The molar ratio of acetic acid to prodrug parent was 0.74～0.93∶1. The structures of target products were confirmed by ESI-MS and 1HNMR. The synthesis method was simple and the yield of eight compounds was from 16.1% to 40.7%. A potential compound Ⅲh (tenofovir dihydroxyacetone ethylene ketal) was screened by preliminary activity study. Compared with tenofovir dipivoxil fumarate(TDF), the stability of compound Ⅲh in rat and human plasma in vitro were respectively increased by 2-fold and 2.5-fold. The live and kidney PMPA AUC(0-t) of compound Ⅲh in mice in vivo were respectively (47314.75±10128.11) (μg•h)/L and (21670.64±8964.98) (μg•h)/L while the AUC(0-t) of TDF were respectively (213269.79±10750.47) (μg•h)/L and (46379.24±3944.65) (μg•h)/L. This prodrug showed a certain liver targeting and low nephrotoxicity, which was worthy of further research.