Abstract:The second generation Boltorn-type hyperbranched polyester (HBP) with 16 hydroxyl at the end was synthesized by melting polycondensation reaction. It was based on pentaerythritol (B4) as a core molecule and 2,2-dimethylolpropionic acid (AB2) as monomer and p-toluenesulfonic acid as catalysis. To form the modified hyperbranched polyester GHBP1 and GHBP2, the hydroxyl was further modified by methacryloyl chloride and propionyl chloride introducing all or part of the double bond at the end of HBP. Adding different proportions of GHBP to the conventional dental restorative resin system of bisphenol A glycerolatedimethacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA), its influence on the volumetric shrinkage and double bond conversion was investigated. The results indicated that modification with GHBP lead to an obvious decrease in the volumetric shrinkage but a slightly change in the degree of conversion. GHBP2 exhibited better reducing volumetric shrinkage properties.

Abstract:A series of superabsorbent composites(MS-g-PAA/PGS) based on maize straw,acrylic acid, and palygorskite clays from different zones as the inorganic additives were synthesized through a solution polymerization. The structure and morphologies of palygorskite clays were characterized by FTIR spectra, XRD, SEM and thermogravimetry analysis techniques. The structure and morphologies of the superabsorbent composites were characterized by FTIR and SEM. The composition, structure and morphologies of palygorskite clays and their effects on the water absorbency and water retention of the composites were investigated. The results indicated that the superabsorbent composite based on palygorskite clay from jingyuan shows the best water absorbency and water retention ability.

Abstract:Metal-modified molecular sieves (MAPO-5, M=Co, Mn, Fe) have been hydrothermal synthesized and investigated in the selective oxidation of p-tert-butyltoluene (PTBT) to p-tert-butyltolualdehyde (PTBD). CoAPO-5 exhibited the best catalytic activity. Under the optimized conditions: reaction time 6 h, PTBT 5 g (33.7 mmol), CoAPO-5 0.3 g, tert-butyl hydroperoxide 12.2 g (134.8mmol), acetonitrile 18 mL, reaction temperature 70 ℃, the conversion of PTBT reached to 15.5% with a PTBD selectivity of 73.4%. Recycle runs suggested that CoAPO-5 was stable for at least 5 cycles without obvious changes of catalytic activity and selectivity.

Abstract:A novel gum arabic-g-poly(2-acrylamido-2-methylpropanesulfonicacid) superabsorbent resin was synthesized by aqueous solution polymerization using microwave irradiation in the presence of potassium persulfate (KPS) as a initiator and N, N-methylene-bis-acrylamide (NMBA) as a crosslinking agent. The effects of the mass ratio of AMPS to GA, crosslinker, initiator, neutralization degree, power and time on the water absorbency of superabsorbent resin were investigated systematically, and the swelling properties of superabsorbent resin were studied. The chemical micstructure of GA-g-PAMPS superabsorbent resin was determined by FTIR. Under the optimum reaction conditions,the water absorbency of superabsorbent resin is 683g/g in the deionized water and 137g/g in normal saline. The water absorbency of the superabsorbent resin decreases with increasing concentration of various external saline solutions, and has the following tendency in different metal ions saline solutions: NaCl>CaCl2> FeCl3,The superabsorbent resin has a high water absorbent rate and a good reswelling capability。

Abstract:In this paper a ternary complex was reported. The chemical composition of the complex was [Fe(C7H5O3)(C9H6NO)]2, which was determined by elemental analysis, fluorescence spectroscopy, UV-visible spectra and IR spectra analysis. In this reaction salicylic acid coordinated with Fe(III) ion by carboxylic ion, and the phenol hydroxyl did not participate. The oxygen atom and heterocyclic nitrogen atom of 8-hydroxyquinoline were bidentate-coordinated with Fe(III) ion, forming a pentaheterocyclic. Extended the absorption of the compex into the whole visible-light region, the color of its powder and the concentrated solution showed black, the diluted solution was purple. When the excitation wavelength was 300 nm, the ternary compound emitted a strong fluorescence at 409 nm. The inhibitory effect of the ternary complex on the growth of E. Coli was studied by using spectrophotometry. The result showed that the growth of E. Coli was promoted when the concentration of the ternary complex was lower than 2 mmolL-1, however it was inhibited when the concentration beyond 2 mmolL-1. And the more higher the concentration was, the more stronger inhibition was. That was to say the complex had a bidirectional biological effect on the growth of E. Coli.

Abstract:By investigating of the optical properties of the first generation π-conjugate unsymmetrical dendrimer with anthracene core (PD-G1), we found that compared to the G-OH, the increasing of the conjugate length resulted in the improvement of the range and intensity of the absorption and fluorescence emission spectra, and shows an energy funnel effect from the outside branches to the anthracene core. Fluorescence quenching phenomenon via the formation of ion pairs with the electron-defect compounds nitrobenzene, 2,4,6-trinitrotoluene (TNT), and electron-sufficient compound p-dimethoxy benzene indicated that the PD-G1 can act as either electron acceptor or donor, and the quenching constant were 144, 557 and 169 L/mol, respectively. The quenching efficiency of TNT to PD-G1 can reach 74%. Hence the PD-G1 shows potentially application in light harvesting, emission and fluorescent sensor material.

Abstract:Anionic hydrophilic monomer (ASPU), cationic (CSPU) and nonionic (NSPU) polyurethane/nano SiO2 composite emulsions were synthesized by 2,2-dihydroxy methyl propionic acid (DMPA)， methyl diethanolamine (MDEA) and polyethylene glycol (YMER N-120) with sol-gel procedures, respectively. KH-550 was the capping agent of prepolymer. SEM， TGA， FTIR， DSC， XRD and tensile testing machine were performed on the films to test the surface appearance, thermal properties, the structure and mechanical properties of the composite films. The results showed that the average particle size of NSPU was the biggest. The order of crystallinity: NSPU>CSPU>ASPU; The order of tensile strength and shore hardness: ASPU>CSPU>NSPU. Anionic hydrophilic monomer and cationic (CSPU) polyurethane/nano SiO2 composite films had better thermal properties, water resistance and mechanical properties；nonionic (NSPU) polyurethane/nano SiO2 composite films had better flexibility, alkali resistance and acid resistance.

Abstract:Two carbazole-based pyrene compounds, 9-(4-(pyren-1-ylethynyl)phenyl)-9H- carbazole and 1,6-bis((4-(9H-carbazol-9-yl) phenyl)ethynyl)pyrene were synthesized by 1-bromopyrene, 1,6-dibromopyrene and 9-(4-ethynylphenyl)-9H-carbazole via Sonogashira coupling reaction. All proposed structures are characterized by melting point, 1H NMR and elemental analyses. Their optical properties were investigated by UV-vis absorption and emission spectra with the aim of understanding the structure-property correlations. The results indicate that the introduction of carbazole unit as electron donor in the pyrene-based molecule can increase the conjugation, structural rigid and fluorescent quantum yields of the compounds. The optical properties could be tuned by the modification of the structures. These compounds can be utilized as efficient blue fluorescent materials (λemmax = 413 ~ 446 nm, ФF = 0.58 ~ 1.08), which have potential applications in the field of organic lighting-emitting diodes (OLEDS).

Abstract:Polyethylene glycol perfluorononyl monoethers (C9F17–PEG-n) and diethers (C9F17 –PEG-n–C9F17) were prepared from polyethylene glycol (PEG-n) and perfluorononene (C9F18), the relations of surface performances to molecular of C9F17–PEG-n and C9F17–PEG-n –C9F17 were investigated. Their surface tensions(γ), critical micelle concentrations(CMC), cloud points, foaming characterisitics and emulsifiabilities were studied. C9F17–PEG-n–C9F17) is smaller minimum molecular area(Amin), greater saturated adsorption quantity (Γm), lower clued point, worse emulsifiability for toluene, but better surfactivities and greater foaming volume of their aqueous solutions than C9F17–PEG-n. For C9F17–PEG-n or C9F17–PEG-n–C9F17, Γm decline, Amin increase and the emulsifiability becomes better for toluene along with the increase of n; the CMC, γCMC and clued point of their aqueous solutions ascend, their foaming volumes increase and then decline and get the biggest value at n=1000.

Abstract:In order to reduce high injection pressure in low permeability oilfield, MT-01 gemini surfactant has been synthesized for the test on the depressurization and injection augmenting effcct. The experimental results are as follows: when the mass concentration of MT-01 gemini surfactant is 800 mg/L, the surface tension can been decreased the lowest and can prevent the swelling of the clay, and the oil/water interfacial tension can be decreased effectively, the gemini surfactant makes the wettability of core surface change from hydrophilic to intermediate wettability. Finally, the gemini surfactant is good for improving water injection by core displacement experiments. The displacement pressure could be reduced up to 29％ and the relative permeability of the water phase could be increased up to 40％ by injecting 2 PV surfactant solutions in the range of 400~1000 mg/L. The new type gemini surfactant has a good application potential.

Abstract:Enzymatic synthesis of L-5-Hydroxytryptophan from L-serine and 5-hydroxyindole catalyzed by tryptophan synthase from recombinant Escherichia coli were studied. The factors such as temperature, pH, molar ratio of L-serine to 5-hydroxyindole and substrate concentration were investigated. The optimal temperature and pH value were 35 篊 and 9, respectively. The optimal molar ratio of 5-hydroxyindole to L-serine was 1.1: 1. The optimal substrate concentration of L-serine was 200 mmol/L. Under the optimal conditions, bioconversion rate of L-serine reached 86% after 18 h.

Abstract:The strains belong to Enterobacer spp. and Citrobacter spp. were tested to degrade gallic acid to product pyrogallol in the CDM medium thought the substrate induction test, and Enterobacer aerogenes was screened as the stable high-yielding strain of pyrogallol. Fermentation temperature、substrate concentration、initial pH of fermentation medium and such influence factors which could effect the yield of pyrogallol were explored, then designed 3 factors 3 levels of response surface in the Box-Behnken experimental analysis and model modification, in order to determine optimum fermentation conditions of Enterobacter aerogenes. The verified experiment results showed that the yield of pyrogallol could reach to 77.86% when the fermentation temperature was 32℃, substrate concentration was 0.32%, and pH of the initial fermentation medium was 6.0, and the yield was better than the chemical method or other biological method in the similar condition, so the study could direct the industries to prepare the pyrogallol from gallic acid thought the biological processes.

Abstract:Abstract: Polyphenol content from neem leaf was measured at 750nm wavelength with gallic acid as standard by the using Folin-Ciocalteu method. The extraction conditions of total polyphenol from the neem leaf were optimized by solvent refluxing method. The interactions between the variables, and three response variables such as extract temperature, time and ethanol concentration affected on the extraction of polyphenol from neem leaf were investigated by the single factor experiment and response surface method. And the extraction process was optimized. Moreover, antioxidant activity of polyphenol in leaves of neem was evaluated by in vitro. Experimental results show: (1) the optimum extraction conditions of polyphenol from the neem leaf were temperature 77 ℃, extraction time 80 min and ethanol concentration 50 %; (2) the influence order of response variables was extraction temperature, extraction time, ethanol concentration; (3) the average extract ratio of polyphenol in the neem leaf was 3.12 %; (4) under the same concentration, the antioxidant activity of polyphenol extracted from neem leaf was stronger than that of Vc, and the IC50 values of phenolics scavenging activity on DPPH was approximately 4.6 mg/L. It was less than that of Vc which was approximately 9.8 mg/L. (5) the 23 mg/L of IC50 values of neem leaf phenolics scavenging activity on OH was less than that of Vc which was about 85 mg/L.

Abstract:(S)-1-(2-chloroacetyl)pyrrolidine-2-carbonitrile was synthesized from L-proline via successive reactions with chloro-acetyl chloride，ammoniated by 1,1'-Carbonyldiimidazole with ammonium bicarbonate and dehydrated by phosphorus oxychloride;3-Aminoadamantanol was synthesized from 1-Adamantanamine hydrochloride by mixed acids, and then was replaced by alkali. This intermediate reacted with (S)-1-(2-chloroacetyl)pyrrolidine-2-carbonitrile to product the target compound vildagliptin. The Entire route is simple and easy to get raw materials, fewer steps, simple operation, mild reaction conditions. The total yield of vildagliptin was increased from 32% to 42%, purity more than 99%, The structure of product was characterized by IR, 1H NMR and MS.

Abstract:The structure and synthesis of cyromazine-amino labeled with 15N were proposed, according to the literature of synthesis of cyromazine with natural abundance and testing requirements of the internal standard. Cyanuric chloride, as the starting material, reacted with ammonia-15N to form 2,4-diamine-15N2-6-chloro-1,3,5-triazine; then the latter reaction with cyclopropylamine, produced Cyromazine-amino-15N2, the desired product by 2 steps. The utilization of ammonia was significantly improved (from 59.0% to 80.0%) by partial substitution of ammonia with sodium carbonate. The yield of Cyromazine-amino-15N2 was 68.1% based on ammonia-15N. The product was characterized by means of NMR and MS. Its chemical purity was 99.7% and isotopic enrichment of 98.8% 15N. The preparated cyromazine-amino-15N2 was used asinternal standard to detect cyromazine by LC-ESI-MS with a good linear relationgship (R=0.99995) at 0.2~5 mg/kg range. So it could be used as internal standard in the field of food safety testing.

Abstract:Abstract : Selecting melamine and formaldehyde as raw materials, the eco-friendly high-etherification melamine formaldehyde resin was prepared through dry method with low formaldehyde, high solid content and high stability. Meanwhile, factors such as ratio of the material in each reaction stage, temperature, pH, were discussed to confirm the optimal preparation condition. The results indicated that when hydroxymethylation reaction stage n（melamine）：n（formaldehyde）= 1:10, reaction temperature was 75 ℃, pH was 9.0, the reaction time was 50 min, and when etherification reaction stage n（HMM）：n（alcohol）= 1:10, the reaction temperature was 65 ℃, pH was 5.5, the solid content of high-etherification melamine formaldehyde resin was higher than 90%, and the content of hydroxyl methyl was 51.4% ,while the free formaldehyde content was less than 0.3%.

Abstract:For fenugreek gum thickener,now using sodium tetraborate,butyl titanate, triethanolamine,glycerin and glycol as raw materials,organic titanium boron crosslinking agent was synthesized,and fenugreek gum fracturing fluid was prepared. The study has studied the effects of the main agent and ligand material ratio,reaction temperature and reaction time on the properties of crosslinking agent gelling.The results showed that the m(sodium tetraborate):m(butyl titanate)=1:4,m (triethanolamine):m(glycerin)=1:2,reaction temperature 70℃,reaction time is 3h, crosslinking agent has the optimal performance.Examined the w(fenugreek gum solution)=0.4%,crosslinking ratio m(fenugreek gum solution):m(titanium boron crosslinking agent)=100:(0.4~0.6),the fenugreek gum fracturing fluid performance shows that:the delayed time was 150s,the shearing resistance and temperature tolerance were good;Under normal temperature,when the sand ratio was 30% in volume,the settling velocity was 0.009mm•s-1;Gel breaking liquid viscosity is lower than 5mPa•s,and it is less damage to the reservoir.

Abstract:Abstract: To improve the mechanics and dispersion performance of attapulgite (ATP) in epoxy acrylate (EA) coating, SiO2/ATP composites were prepared by chemical precipitation and then modified with silane coupling agent KH570 to obtain KH570-g-SiO2/ATP composites. The composites were characterized by TEM, FT-IR, XRD and TG methods. The UV-curable KH570-g-SiO2/ATP /EA composite coating was fabricated by the blend method. The effects of KH570-g-SiO2/ATP content on the impact-resistance, the flexibility of the KH570-g-SiO2/ATP /EA composite coatings were investigated. The results show that the impact-resistance of the KH570-g-SiO2/ATP /EA composite coating increases from 15 cm to 35 cm, the flexibility increases from 15 mm to 5 mm when the KH570-g-SiO2/ATP dosage is 5%. In addition, KH570-g-SiO2/ATP has a better dispersibility in the EA composite coating than ATP, SiO2/ATP and KH570-g- ATP.

Abstract:Acrylic acid(AA) and hydroxyethyl methacrylate(HEMA) were grafted onto chlorinated polypropylene(CPP) via solution polymerization. The effects of the content of acrylate monomer and the content of initiator on the graft ratio were investigated. The optimum conditions of the graft reaction was that the content of the acrylate monomer was 20%(compared to the mass of CPP) ,the content of the initiator was 3%( compared to the total mass of CPP and AA and HEMA) and the graft ratio reached 8.81%.On the basis of the graft reaction, the grafted CPP was UV modified by methacryloyl chloride. The performance of emulsion ,the surface tension and the adhesion of series of waterborne UV curable CPP with different AA content were investigated. The results showed that stable emulsion was obtained when the content of AA was 20~50%(compared to the total mass of AA and HEMA), and the particle size of the emulsion decreased with the content of AA increased. After UV modified by methacryloyl chloride and after UV cure, the surface property was good ,the surface tension was 40 mN/m or more, the adhesion was improved. This material meets the environmental requirements and has good application prospect.

Abstract:The copolymer (GO-PCs) of graphene oxide (GO) and monomers of polycarboxylate superplasticizer (PCs) was synthesized by free-radical copolymerization of GO and methylacrylic acid polyethylene glycol single methyl ether (MAAPEGME), methacrylic acid (MAA) as well as sodium methallyl sulfonate (SMAS). The product was designed to solve application problems of GO in cement based materials, such as dispersion unevenly and reducing of cement paste fluidity. The GO-PCs was prepared by the weight ratios of MAAPEGME, MAA, SMAS and GO of 17:2:1:0.2. The tested results indicated that the copolymerization of GO and monomers were taken placed and GO naosheets were dispersed uniformly among PCs. The results indicated that the aim with GO to unevenly disperse in cement materials and reinforce/toughen cement materials as well as do not impact its fluidity have been achieved. The results of SEM showed that GO-PCs have stronger controlling for microstructure of cement materials. The research result has positive meaning to preparation of high-performance and long-life concrete.

Abstract:Raney copper has been employed for the catalytic hydrogenation of furfural (FA) to cyclopentanone (CPO)and cyclopentanol(CPL).Effects of solvent type, volume ratio of solvent , volume ratio of reactants and solvent, reaction temperature ,reaction pressure and reaction time on the FA conversion and selectivity are investigated in detail. Under the optimal conditions (V(methanol):V(water)= 4:1, V(FA):V(solvent)=1:10,180℃,3MPa and 4 h)),the conversion of furfural is 98.9% and the selectivity of cyclopentanone and cyclopentanol is 52.9% and 19.3% respectively. The microstructure of Raney copper is characterized by XRD, BET and SEM.

Abstract:A series of symmetric monomer of polyimide were prepared by condensation reaction and reduction reaction from p-chloronitrobenzene and the diols. The effects of the molar ratio of the materials, the amount of potassium carbonate, reaction time, reaction pressure and catalyst on the yield were studied. The optimum reaction conditions were obtained as follows: the molar ratio of raw materials1:2.5, the amount of potassium carbonate 15.9 g, reaction time 24 h；the reduction reaction pressure 0.6 MPa, the amount of catalyst 0.30 g, reaction temperature 70℃. The total yield of 1,2-bis (p-aminophenoxy) ethane was 74.1% under these condtions. The optimum reaction conditions were also applied in the synthesis of other 3 diamines with yields in the range of 49.4%~65.7%.

Abstract:3-iodo-N1-(2-methyl-4-(perfluoropropan-2-yl)-N2-(2-methyl-1-(methylsulfinyl)propan-2-yl)phenyl)phthalamide was synthesized from isobenzofuran-1,3-dione via amidation, oxidization, iodination. The effects of materials' mole ratio, the amount of catalyst, reaction temperature and time on the yield of product were studied. In the improved process, after 4 steps, the total yield could reach 61.1%, and the purity of product was 96.5%. Structures of all intermediates and target product were characterized by 1HNMR and ESI-MS. The recovery and reuse of Palladium carbon could reduce the economic costs. This synthetic route is characterized by cost-effectiveness, simple operation and high yield , which are very promising in industrialization.