Abstract:A luminous ternary complex Sm/Gd(DBM)3phen was synthesized by coordination of samarium using dibenzoyl methane(DBM) as the first liand, 1, 10-phenanthroline(phen) as the second ligand and samarium chloride reaction in the ethanol.A bonded rare earth polyacrylamide copolymer was prepared by copolymerization of the samarium ternary complex with polyacrelamide (PAM). The composition, structure, fluorescence properties and stability of complex and copolymer were characterized by means of elemental analysis, Fourier transform infrared spectroscopy, UV spectroscopy, fluorescence spectroscopy and thermogravimetric analysis, the research results show that the Sm/Gd(DBM)3phen/PAM luminescence performance is better than that of Sm/Gd(DBM)3 phen, the characteristic luminescence of samarium ion 4G5／2—6H5／2, 4G5／2—6H7／2, 4G5／2—6H9／2 at 559,597,643 nm is excited by UV light. The non-luminescent Gd3+ has a significant enhancement on the fluorescence intensity of luminescent Sm3+.

Abstract:Copoly(Aspartic acid-Citric acid)(PAC) was prepared by copolymerizing aspartic acid and citric acid under microwave heating. Referring to the static scale inhibition method, the inhibition performance of PAC as CaCO3 scale inhibitor and the inhibition contrast and compatibility performance of PAC with HEDP were investigated. The morphology and structure of CaCO3 crystals and PAC were characterized by FTIR, NMR, AFM and XRD. The results showed that the synthesis of PAC was from aspartic acid and citric acid by the polymerization reaction of amidation and hydrolysis. PAC had excellent inhibition on CaCO3 scale, and its inhibition effects were superior to HEDP. The inhibition efficiency of PAC on CaCO3 reached 95.04% when the dose was 6.4 mg/L. PAC had better compatibility performance with HEDP, the inhibition effects of PAC/HEDP were superior to PAC. The analysis results of AFM and XRD showed that the morphology and structure of CaCO3 crystals were changed by PAC, transforming the most stable’s calcite into the most unstable’s vaterite.

Abstract:Cellulose nanocrystals (CNC) with high aspect ratio of 50 have been readily prepared from the inexpensive fruit shell of Camellia oleifera Abel (SCOA) for the first time. In this study, SOCA was consecutively subjected to sulfite pulping and acid hydrolysis to remove non-cellulosic components，release CNC and prepare highly transparent film. The derived CNC possesses a needle-shaped structure that in average diameter and length of 8 ± 2 nm and 400 ± 100 nm, respectively. The crystallinity index of CNC increased to 72% and the initial decomposition temperature raised to 230 °C. The obtained CNC was formed to nanopaper by vacuum filtration showing high visible light transmittance over 80 % and high strength. Thus SOCA derived CNC is of great practical potential to apply in the field of food packaging.

Abstract:A series of saturated alkyl chain decorated triphenylamine amino derivatives (Ⅱb~d) were constructed through condensation reaction and selective reduction of polar double bond with metal boron hydride reactants using 4-{2-[N, N-bis(4-methylphenyl) aminophenyl]ethenyl}-benzaldehyde as starting materials. The synthetic route was optimized by controlling reaction time and charging sequence, gradient strengthening reductive ability of reductant. The results show that the ortho double bond of nitro group can be efficiently reducted with sodium borohydride at -5℃. However reduction of the ortho double bond of cyano group requires lithium boronhydride at 80℃ for as long as 10 h. Finally the triphenylamine amino derivates were linked to electron-deficient nitrogen heterocyclic unit (1,3,5-triazine) to form the corresponding covalently linked donor-acceptor (D-A) dyads. The products were characterized by 1HNMR, 13CNMR, high resolution mass spectrometry and infrared absorption spectroscopy. The results of UV-vis absorption, fluorescence emission and electrochemical measurements reveal the potential of these dyads to form long-lived charge-separated state for the application in photovoltaic devices.

Abstract:Mn/ATP desulfurizers were prepared by precipitation method and calcination activation with attapulgite (ATP) as carrier. The Mn/ATP desulfurizers were characterized by means of XRD, TG, IR, SEM and H2-TPR. The change of desulfurizers was analyzed by thermodynamic calculation in the process of roasting activation. The desulfurization activity of Mn/ATP under normal temperature was investigated in a fixed bed reactor. The results show that the calcination temperature and calcination method have great influence on desulfurization agent. With the increase of temperature, MnCO3 decomposes into MnO2 in static air; When oxygen content decreases, MnO2 gradually decomposes into lower valence manganese oxides; Changing the roasting method, the sufficient oxygen content reduces the activation temperature of the desulfurizer, and inhibits the decomposition reaction of MnO2. The MnO2/ATP prepared by roasting in dynamic air at 400℃ has the maximum desulfurization activity at room temperature of 20℃, and the breakthrough sulfur content is 172 mg/g.

Abstract:With glycyrrhizic acid, different monomers (methacrylic acid, hydroxyethyl methacrylate and 4-vinyl pyridine) and cross-linkers (divinylbenzene and ethylene glycol two methacrylate) as raw materials, a series of molecularly imprinted polymers (MIPs) were prepared by precipitation polymerization in the mixed solution of 25 mL acetonitrile and 8 mL N,N-dimethylformamide (DMF) with azodiisobutyronitrile as initiator.The MIPs were characterized and tested by FTIR, SEM and BET.The preparation process of MIPs was optimized, and the results showed that when the cross-linker was divinylbenzene, the monomer was methacrylic acid，the molar ratio of glycyrrhizic acid and methacrylic acid was 1:10 and the porogen was the mixed solution of 25 mL acetonitrile and 8 mL DMF, MIPs showed the best adsorption performance for glycyrrhizic acid.The equilibrium adsorption capacity of glycyrrhizic acid was 398.5 mg/g and the imprinting factor was 3.73 in glycyrrhizic acid solution of 5 g/L.The adsorption kinetics and adsorption isotherm of MIPs were studied.The extract of licorice was refined by molecular imprinted solid phase extraction (MISPE),and the mass fraction of glycyrrhizic acid was increased to 73.10% from 11.27%with 87.1% recovery yield.

Abstract:Benzyl alginate derivative (BAD) was prepared by bimolecular nucleophilic substitution reaction (SN2) using the benzyl bromide as a hydrophobic modifier. The structure and performance of BAD was characterized by FTIR, 1HNMR, TGA, UV-Vis, GPC, DLS and Zeta potential analyzer. Experimental results showed that the degree of substitution of the obtained product (49.21 % and 29.33 %) was close to the molar ratio of benzyl bromide to uronic acid, indicating that SN2 reaction was active with large degree of substitution. After modification, the molecular weight (MW) of BAD decreased from 91544 to 79819. And the micellar aggregates were formed by BAD under hydrothermal driving forces with the hydrodynamic diameter (dH) as 423.4 nm and the zeta potential value as -36.4 mV. Furthermore, with the increase of pH, the Zeta potential of BAD tended to decrease, while its hydrodynamic size (dH) firstly increased and then decreased. Meanwhile, with the increase of ionic strength, the dH and Zeta potential of BAD firstly increase and then decrease, which revealed that BAD may possess certain colloidal and interfacial activity.

Abstract:The preparation of three dimensional graphene/polyurethane (3DGP) composites in cross-bite can be achieved through two steps. To begin with, Graphene aerogel (GA) is prepared by hydrothermal reduction and freeze-drying with graphene oxide (GO) as the precursor of network framework. Secondly, it is necessary to employ polyurethane (PU) as a filler of composite material with adjusted hardness and fluidity to impregnate GA in a vacuum state. The structure and morphology of GO、GA and 3DGP were characterized and analyzed with the help of SEM, Raman and FTIR, as the thermal stability and piezoresistive characteristics are tested by means of TGA-DSC and self-made piezoresistive test platform. The results demonstrate that: the 6 g/L aqueous solution of GO is interconnected with GO layers impacted by the action of EDA reducing agent, which can also form a regular honeycomb three-dimensional network with the pore size about 0.8 mm, as PU and GA can be well occluded in 3DGP. Besides, the continuity of the three-dimensional network skeleton provides a good channel for the phonon of the heat transport carrier, which remarkably enhances the thermal stability of 3DGP and increases by 45 degrees centigrade than that of the PU at the weight loss rate of 5%. Additionally, it has low hysteresis (8.7%) and shows two piezoresistive effects in piezoresistive measurement range.

Abstract:Fluorescent waterborne polyurethane(FWPU1~3) with different molecular weight polyethylene glycol was prepared by in situ polymerization of N,N-dihydroxyethylaniline-β-terpyridine (TPPDA) as fluorescent molecules; different amounts of acrylamide (AM) were introduced into FWPU to prepare a series of polyurethane-polyacrylamide complex fluorescent hydrogels (FWPUH1~6). The structure and fluorescence properties of TPPDA and FWPUH were tested by FTIR, solid UV absorption and fluorescence spectroscopy. The results show that the main UV absorption peak of FWPUH is red shift compared with TPPDA, the maximum fluorescence emission wavelength was blue-shifted, the fluorescence quantum yield increases, and its fluorescence emission intensity increases obviously; with the increase of PEG molecular weight and the increase of AM content, the fluorescence intensity of FWPUH increased. When the soft segment was PEG4000, mass ratio of FWPU and AM were 5:4(FWPUH6), the fluorescence intensity was the largest, and compared with TPPDA, the fluorescence intensity increased by 9.5 times, fluorescence quantum yield also increased by 56%. FWPUH3 reached the maximum equilibrium swelling ratio of 9.95; FWPUH2 had the highest compressive strength (0.70 MPa); the soft glass transition temperature and hard glass transition temperature of FWPUH2 and FWPUH5 were -32.1, -46.0 ℃ and 96.5 and 105.7 ℃.

Abstract:A small molecule chain extender of N-(2-pyrrolidone ethyl) diethanolamine(DVP) diol was synthesized from diethanolamine(DEA) and vinylpyrrolidone(NVP).The waterborne polyurethane with different content of DVP was synthesized by DVP, polyether polyol(N220), isophorone diisocyanate(IPDI), 2,2-dimethylol-propionic acid(DMPA) and diethylene glycol (DEG). The structure of DVP was characterized by Fourier transform infrared spectroscopy (FT-IR)and nuclear magnetic resonance spectroscopy. The structure and properties of waterborne polyurethane with different content of DVP were characterized by infrared, particle size test, thermogravimetry(TGA), mechanical properties test and water absorption test. The results indicate that when the content of DVP is 0.5%(wt), emulsion particle size is 44 nm, the synthesized film has the best comprehensive performance, the tensile strength is 21.04 MPa,the maximum elongation at break is 854.6%, T5% and T50% are 269.6 and 343.5℃ respectively, water absorption is 13.41%, and the mechanical properties, heat resistance and water resistance are improved significantly compared with unmodified waterborne polyurethane.

Abstract:Monoazo C.I.PR31 was prepared using 3-amino-4-methoxybenzanilide (red base KD) and 2-hydroxy-3-naphthoyl m-nitroaniline (naphthol AS-BS) as intermediates by diazotization and coupling reaction. Rosin acid was used as surface modification agent of the pigment in the coupling process, then silica dioxide particles with 1~3 layers were coated on the pigment surface by sol-gel method. The samples were characterized by contact angle measurement, SEM, TEM, color capability and thermogravimetric analysis. The results showed that after the pigment was treated by rosin acid, its crystal morphology changed from long strip to disk shapes, and its polarity was obviously enhanced. When the amount of rosin acid was 3% of the total mass of reactants, the contact angle between the obtained pigment and water was 52.8°, the mean particle size and the particle size distribution were 78 nm and 0.01~0.54 μm, respectively, and the pigment sample exhibited good hydrophilic property. The pigments coated with 2 layers and more than 2 layers of silica dioxide with contact angle values of 0° were completely hydrophilic. The introduction of rosin acid made the pigment hues convert into red and blue, while that of the silica dioxide layer made the pigment hues convert into green and blue. The color difference (ΔE) and tinting strength of the pigment sample with 2 layers of silica dioxide, C.I.PR31*-2SiO2, were 0.96 and 105.09, respectively. In nitrogen environment, the pigment crystals began to decompose at 290℃. It is obvious that the pigment reached the standard of high temperature resistant pigment and could be used in aqueous dispersion system.

Abstract:Folate receptor-targeted nanophotosensitizer (NaYF4:Yb,Tm@NaGdF4:Yb@TiO2 @PEI-PAA-FA) was prepared by coating TiO2 on the upconversion nanoparticles NaYF4:Yb,Tm@NaGdF4:Yb via a hydrolysis method, followed by modification with polyethyleneimine (PEI) and polyacrylic acid (PAA) and subsequent conjugation of folic acid (FA). XRD and TEM were used to characterize the crystal structure and morphology of the inorganic components of the nanophotosensitizer. FTIR and ξ potential were used to verify the binding of these organic components. Upconversion luminescence spectra of the samples were also measured. The decrease in the absorbance of 1,3-Diphenylisobenzofuran solution in the presence of the nanophotosensitizer under 980 nm near-infrared (NIR) laser irradiation indicated the singlet oxygen has been produced from the nanophotosensitizer. Besides, the photosensitizer has a doxorubicin (DOX) loading capacity, the maximum drug loading ratio was 50.8% and the encapsulation efficiency was 84.7%. The DOX release from the nanophotosensitizer was sensitive to the pH value of the buffer. As the DOX-loaded nanophotosensitizer was suspended in an acidic buffer of pH 5.0 and exposed to NIR laser irradiation, the cumulative release of DOX at 12 h was 38.1%, much higher than that obtained from a neutral buffer (pH 7.4), which was 10.4%. These results indicated the DOX-loaded and FA-coupled nanophotosensitizer may be a potential drug for synergistic inactivation of cancer cell by NIR-driven photodynamic therapeutic and chemotherapeutic modalities.

Abstract:Walnut green husk inhibitor (WGHI) was extracted and prepared by reflux extraction with the solvent of ethanol water solution. The inhibition action of WGHI on the corrosion of cold rolled steel in 0.5 mol/L HCl was studied by weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), ultraviolet and visible spectrophotometer (UV), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) methods. The results show that the optimum volume fraction of ethanol solution is 40%, and the corresponding maximum production rate and inhibition efficiency are 14.2% and 90.3%, respectively. WGHI can efficiently inhibit the corrosion of cold rolled steel in 0.5 mol/L HCl. Inhibition performance increases with the concentration of WGHI, but decreases with the increase of temperature. Through both physisorption and chemisorption mechanism, WGHI can adsorb on steel surface spontaneously, in which the heat is released and accompanied by a decrease in chaotic degree, and its adsorption behavior obeys Langmuir adsorption isotherm. The addition of WGHI drastically inhibits both anodic and cathodic reactions for the corrosion of steel, and can be arranged as a mixed-type inhibitor. Nyquist appears an individual depressed capacitive loop, and the impedance increases with the increase of WGHI concentration. Inspection of the micrographs of corroded steel surface reveals that WGHI can efficiently retard the corrosion and decrease the surface roughness of steel surface in HCl solution.

Abstract:Magnetic silica chitosan microspheres (MSC) were prepared by orderly grafting SiO2 and chitosan layer on the surface of Fe3O4 nanoparticles, and after modified with epoxy groups, the microspheres were used for immobilization of naringinase. The pH, temperature, storage and operational stability of naringin hydrolysis by the immobilized naringinase were investigated. The optimal immobilization conditions were determined as follows: immobilization pH, temperature and time were 3.0, 30 ℃ and 4 h, respectively, and 57.48 U/mL of crude naringinase broth activity. As a result, the binding efficiency, activity recovery rate and specific activity of the immobilized naringinase were 31.29%, 88.92% and 409.33 U/g, respectively. Comparing with free naringinase, the immobilized naringinase used for naringin hydrolysis showed better pH stability and thermal stability, and it retained 53.36% residual activity after 8 consecutive operations and 80.97% residual activity after one month of storage.

Abstract:A series of Mg modified NiGa hydrotalcite-like compounds (Ni2MgxGa-LDHs，x=0, 1 and 2) have been prepared by coprecipitation method, and the structure, composition and the amount of surface basic site were characterized by XRD, SEM, FTIR, ICP and Hammet indicators method. These catalysts were then studied in the selective oxidation of alcohol to aldehyde using molecular oxygen as the oxidant. The results indicated that introduction of Mg could efficiently improve the surface basicity and the catalytic activity in the selective oxidation of alcohol. Under the selected conditions (benzyl alcohol 1 mmol, me-sitylene 5 mL, Ni2Mg2Ga-LDH 0.5 g, 120 ℃, O2 10 mL/min, 4 h), the conversion of benzyl alcohol and the selectivity of benzaldehyde reached above 99%. The catalytic system could tolerate various substrates. The catalysts could be recycled 4 times without obvious loss of the catalytic activity, indicating its high stability.

Abstract:Using ammonium molybdate and chloroplatinic acid as raw materials, through the in-situ temperature-programmed carbonization process, Pt/MoC catalysts with different loading amounts were synthesized and their catalytic performances in the hydrogen evolution reaction (HER) of electrolyzed water were investigated. The microstructure and physicochemical properties of the catalysts were characterized by XRD, BET, SEM, TEM and XPS. The results show that the Pt loading changes the topological structure of molybdenum carbide during the carbonization process, and the Pt-loaded sample more easily forms the α-Mo2C phase. The loading of Pt has a significant effect on the molybdenum carbide catalyst in the HER reaction. The 1.6 Pt/MoC catalyst exhibits an optimal catalytic effect (overpotential ηonset = 108 mV, Tafel slope b = 74 mV∙dec-1) and The lower impedance (18.77 Ω) is comparable to commercial Pt/C catalysts.

Abstract:Ni-P catalysts were prepared by the solvothermal method. Ethylene glycol, NiCl2•6H2O and NaH2PO2•H2O were used as the solvent, the nickel source and the phosphorous source respectively, where n(P):n(Ni)=3:1. Catalysts were characterized by XRD, SEM, TEM, H2-TPR, H2-TPD, N2 adsorption-desorption as well as XPS. Then, experiments were carried out to evaluate Ni-P catalysts under different reaction conditions. Ni-P catalysts exhibited outstanding performance during the hydrogenation reaction under optimized conditions, where the conversion of furfural and the yield of cyclopentanone reached 98.87% and 68.65%. Finally, research results indicated that no obvious decrease were observed in catalytic performance after 5-time regeneration cycle. Thus, Ni-P catalysts demonstrated good stability as well.

Abstract:The volatile components of Hangzhou Chrysanthemum moriflium Ramat extract were analyzed by solid phase microextraction (SPME) and solvent-assisted flavor evaporation (SAFE) combined with gas chromatography-mass spectrometry (GC-MS). The aroma active compounds in the extract were further analyzed by gas chromatography-olfactometry (GC-O) in aromatic dilution method (AEDA). The results showed that a total of 119 compounds were detected in the two pretreatment methods, 30 alcohols, 6 acids, 28 esters, 4 aldehydes, 12 ketones, 36 hydrocarbons, and 3 others. Monoterpenes, sesquiterpenes, and their oxygen-containing derivatives are the main compounds. SAFE is suitable for extraction than SPME. A total of 35 aroma active ingredients were identified. The aroma active compounds with higher flavor dilution factor (FD factor) were linalool (2187) , α-caryophyllene (729), ethyl phenylacetate (729), ethyl caproate (729), ethyl isovalerate (729), α-pinene (243), α-terpineol (243) and iso valeric acid (243).

Abstract:Oxidation of starch with H2O2 was catalyzed by tungstate, metavanadate and copper-iron salts, respectively. The oxidation degree of oxidized starch and H2O2 decomposition rate were determined. The functional groups and molecular weight of oxidized starch were characterized by 13C-NMR, FT-IR and GPC. Then the tanning performance of oxidized starch-zirconium complexes was investigated. The hydroxyl groups on the C-2, C-3 and C-6 of glucose unit were oxidized to carbonyl and carboxyl groups, and the glycosidic bonds were broken during oxidation using cooper-iron salts as catalyst. This resulted in a relatively low molecular weight (14628) and a high oxidation degree (72.5%) of the oxidized starch. When it was used as a ligand of zirconium tanning agent, the Zr distribution (97.8%) and fixation (w(ZrO2)=8.0%) in leather were remarkably improved, and the shrinkage temperature of leather achieved 89.7℃, leading to better tanning performance. By comparison, tungstate catalyzed oxidized starch had a higher molecular weight (465095) and a lower oxidation degree (15.0%), and exhibited poorer tanning performance when coordinating with zirconium salt. The properties of metavanadate catalyzed oxidized starch was in between.

Abstract:Fe3O4 magnetic nanoparticles were first prepared by chemical coprecipitation method, and then SiO2 was coated on Fe3O4 nanoparticles by hydrolyzation of tetraethyl orthosilicate. Subsequently, amino-functionalized magnetic nanoparticles (A-MNPs) were obtained by grafting KH-550 on the Fe3O4@SiO2. The microscopic morphology, chemical composition and magnetic properties of nanoparticles were tested by TEM, FTIR and VSM. Next, A-MNPs were applied to purify oily wastewater. It was found that surface amino-functionalization of A-MNPs can improve their pH-sensitivity, thus, the reuse of A-MNPs can be realized by changing pH value. When the pH value of solution was 4, A-MNPs exhibited the best oil removal effect. When the concentration of A-MNPs was 200 mg/L, the light transmittance of the simulated oily wastewater was 99.4%. However, when the concentration of A-MNPs was 500 mg/L, the transmittance could be kept above 80% even after 10 times of repeated use. In addition, A-MNPs had better purification effects for various simulated sewage composed of different concentrations of sodium chloride, kaolinite, emulsified oil and partially hydrolyzed polyacrylamide (HPAM). 375 mg/L A-MNPs could make the light transmittance of complex sewage reach more than 86.5% after purification.

Abstract:A novel nanocomposites, UiO-66/graphene oxide (UiO-66/GO), was synthesized by solvothermal method using ZrCl4 and, H2BDC and GO as raw materials. The surface morphology and recombination state of the composites were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).It was observed that UiO-66 uniformly grew on the GO sheet to form a 2D load structure.X-ray diffraction (XRD) and Infrared spectroscopy (FT-IR) was used to analyze the crystal structure and compositioncomposition of the composites, finding that the addition of GO did not affect the crystal structure of UiO-66.The specific surface area of the nanocomposites was analyzed by N2 adsorption-desorption isotherm, indicating that the composite with 2% mass ratio of GO had the highest specific surface area (738 m2/g). The synergistic effect of UiO-66/GO made the removal rate of Cong red (CR) much higher than that of UiO-66 and GO. The maximum adsorption capacity of UiO-66/GO-2 to CR is 561.79 mg/g, which was 2.8 and 7.1 times that of UiO-66 and GO under the same conditions, respectively.

Abstract:The carbon dots were successfully prepared by hydrothermal reaction using citric acid as the carbon source firstly. And then the 7 - amino - 4 - methyl coumarin (AMC) was used to modify the carbon quantum dots in the EDC / NHS amide reaction system to a coumarin-modified carbon light stabilizer (AMC-CQDs). The optical properties and the application properties on the surface of the paper were studied, and the law of change on chromaticity of the paper was analyzed by the 1931-CIE chromaticity coordinates. The results revealed that the synthesized AMC-CQDs had uniform particle size (4.13nm), good water solubility and UV absorption which could realize the full coverage absorption in UV-light area. The maximum fluorescence emission wavelength of AMC-CQDs was 431nm, the fluorescence quantum yield was 38.7% and initial whiteness of the paper could be increased by 4.71 ISO%, which indicated that the compound was suitable for high yield pulp paper whitening. In addition, the results of chromaticity coordinates showed that the carbon light stabilizer had good performance on the physical whitening effect for the paper with chomaticity coordinates near the line y = 1.553x-0.184.

Abstract:A long chain alcohols with S and N was synthesized by di-n-octylamine and disulfide carbon as intermediate. Which reacted with benzene boric acid, a new type of nitrogen and sulfur containing phenylboronic lubricating oil additive was synthesized. The structure of the intermediate and the synthetic product was characterized by infrared spectroscopy. And elemental analysis was used to test the synthetic product. The hydrolysis stability and the oil solubility in the synthetic base oil (PAO) of the synthetic product were evaluated. The tribological performance of the synthetic product which was added in the PAO was test by four-ball friction and wear testing machine. Scanning electron microscopy (SEM) and energy spectrometer (EDS) was used to analysis the friction surface of steel balls. The results are as follows: the time of hydrolysis was more than 180 h. The synthetic product could completely dissolved in the PAO when the additive ratio was less than 2.5%. When the adding proportion was 2.5%, the PB was 1100 N, increased by 181%. The WSD reached the minimum (0.48mm), which was reduced 30.4%. And the average friction coefficient was reduced 21.6% to 0.087. The synthetic product showed good anti-extreme pressure, anti-wear performance and anti-friction performance. The results show that the wearing of the friction surface was decreased significantly when the synthetic product was added. The friction surface formed by a composite coating which containing S, N, B.

Abstract:The waterborne polyacrylate emulsions with different mass ratios of hard/soft monomer were synthesized by semi-continuous emulsion polymerization technology using methyl methacrylate (MMA), 2-ethylhexyl acrylate (2-EHA), methylacrylic acid (MAA) as hard monomer, soft monomer and functional monomer respectively, ammonium persulfate (APS) as initiator, Sodium dodecyl sulfate (SDS) and AEO-9 as emulsifier. Attenuated total reflection -Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, gel permeation chromatography, thermogravimetric analysis and dynamic thermomechanical analysis were utilized to characterize the bulk structures and properties of waterborne polyacrylate. The results show that the particle size of waterborne polyacrylate emulsions was approximately 100nm, the number average molecular weight and weight average molecular weight of lower molecular weight of polyacrylate copolymers was about 30000g/mol and 50000g/mol respectively. For polyacrylate film, the decomposition temperature increased slightly from 327.5℃ to 343.5℃ and the glass transition temperature decreased from 21℃ to -3.5℃. Moreover, the surface tension of polyacrylate emulsion decreased from 39.83mN/m to 36.71mN/m, the interfacial tension between emulsion and BOPP film decreased from 19.01mN/m to 4.87mN/m, the contact angle of emulsions on BOPP film decreased from 62.6° to 27.8° and the adhesion ratio increased from 50% to 95% with the decreases of mass ratios of hard/soft monomer, indicating that the improvement of the wettability of emulsions was conducive to obtain good adhesion. The wettability of emulsion is the best and the fastness is the highest when the mass ratio of hard/soft monomer is 7/13, which can satisfy the application requirement of polyacrylate emulsion on BOPP film.

Abstract:Pd/Ni bimetal heterogeneous catalyst (Fe3O4@La-MOF-Schiff-Pd/Ni) containging magenic Fe3O4 nanoparticles was prepared by a post-synthesis modification method and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrum (EDS), inductive coupled plasma optical emission spectroscope (ICP), powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscope (XPS). The results showed that Fe3O4 nanoparticles were successfully embedded in La-MOF. The active sites of Pd and Ni were uniformly dispersed in the La-MOF after the post-synthetic modification. The catalyst exhibited high catalytic activity in the Suzuki coupling reaction. When iodobenzene (1.0 mmol) and phenylboronic acid (1.2 mmol) were used as reactants, K2CO3 was used as base, anhydrous ethanol was used as solvent, the amount of catalyst used was 8 mg, the yield of biphenyl was 95% at a reaction temperature of 80℃and a reaction time of 6 h. The catalyst could be easily recovered by magnetic separation and maintain high catalytic activity (82%) after 5 cycles. The proposed mechanism for the Suzuki coupling reaction revealed that Pd and Ni had a synergistic effect on catalytic activity. Moreover, the as-synthesized bimetallic catalyst demonstrated a common applicability to aryl bromides and iodides containing different substituents.

Abstract:The chitosan-based intumescent flame retardant (PMC) containing of carbon source, acid source and gas source was synthesized by chitosan (CTS), pentaerythritol phosphate (PEPA)  and diphenyl-methane-diisocyanate (MDI). The structure and thermal stability of PMC were characterized by FTIR, XRD and TG. EP flame retardant coatings were investigated with different flame retardants and three flame retardant coatings (EP1、EP2 and EP3) were obtained. Also these flame retardant coatings were used as protective coatings for steel structure. The thermal properties and flame retardancy of the samples were characterized by TG, Limiting Oxygen Index（LOI）, UL-94 and SEM, the adhesion strength of the coatings were characterized by adhesion experiment. The results showed that the EP3, whose mass fraction of PMC is 10wt%, could meet the standard of UL-94 V-0 rating; the carbon content of EP3 increased by 47% and the LOI of EP3 reached to 25.5% compared with pure EP coating. The results of adhesion experiment showed that the flame retardants will not impair coating’s adhesion strength.