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Synthesis and characterization of star-comb styrene/butadiene copolymer

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Chinese Chemical Letters 2010年第11期21卷 1370-1373页

作者： Qing Min Zhang Chuang Chen Hong Xia Zhang Chun Qing Zhang Yang Li Xi Gao Jian State Key Laboratory of Fine Chemicals Department of Polymer Science and Engineering School of Chemical Engineering Dalian University of Technology Dalian 116012 China Liaoning Province Key Laboratory of Polymer Science and Engineering Dalian 116012 China

A novel star-comb styrene/butadiene copolymer（SC-SBC） was synthesized by anionic polymerization and grafting reaction with epoxidized star liquid polybutadiene（ESPB） as coupling *** overall shape of the star-comb macromolecules can be altered by changing the molecular weight and number of the side *** molecular parameters and mechanical properties of the SC-SBC resins were *** notched izod impact strength of the SC-SBC resins are excellent and reach as high as to 239 J/m.

关键词： Anionic polymerization Epoxidation grafting reaction Star-comb copolymer Side chain

Modification of Sepiolite by Treatment with Methyl Triethoxysilane

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Journal of Wuhan University of Technology(Materials Science) 2004年第1期19卷 44-47页

作者：贾堤 Tianjin University

grafting reaction of methyltriethoxysilane on sepiolite surface was *** structure of the silanized product before and after thermal treatment was characterized by XRD,TG-DTA,SEM and *** is found that the silicon monomers are grafted on the external surface of sepiolite via silicon *** thermal stability remains unchanged after silanization.

关键词： methyl triethoxy-silane sepiolite thermal stability grafting reaction

Synthesis and characterization of star-comb polybutadiene and poly(ethylene-co-butene)

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Chinese Chemical Letters 2010年第3期21卷 361-364页

作者： Zhang, Hong Xia Li, Yang Zhang, Chun Qing Hu, Yan Ming Wang, Yu Rong Ma, Hong Wei Li, Wei Dalian Univ Technol Sch Chem Engn Dept Polymer Sci & Engn State Key Lab Fine Chem Dalian 116012 Peoples R China

A novel star-comb polybutadiene(SC-PB) was synthesized with n-butyllithium(n-BuLi) as initiator,epoxidized star liquid polybutadiene(ESPB) as coupling agent,cyclohexane as solvent by living anionic polymerization and grafting-onto technology. The SC-PB was subsequently hydrogenated by homogeneous catalysis(catalytic hydrogenation using nickel naphthenate/ triisobutyl aluminum),to transform the SC-PB into the corresponding star-comb poly(ethylene-co-butene)(SC-PEB).The SC-PB was characterized by SEC-TALLS,~1...

关键词： Anionic polymerization grafting reaction Epoxy group Star-comb polymer Hydrogenation

Allyl-containing Poly(aryl ether sulfone): Synthesis and Crosslinking

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Chemical Research in Chinese Universities 2011年第3期27卷 520-523页

作者： YU Yun-wu XING Yan GUO Mei-mei LIU Bai-jun JIANG Zhen-hua Alan G. MacDiarmid Institute College of Chemistry JiJin University Changehun 130012 R R. China

A novel type of crosslinkable poly（aryl ether sulfone）（PAES） bearing an allyl pendant（PES-OAllyl） was synthesized by a grafting reaction of hydrophenyl-containing PAES（PES-OH） and allyl bromide. PES-OH was prepared by a demethylation reaction of a methoxyphenylated PAES（PES-OCH3） in the presence of pyridine/hydrochlo- ride. The PES-OCH3 was synthesized by an aromatic nucleophilic substitution of bis（4-chlorophenyl）sulfone and （p-methoxy）phenylhydroquinone. Both DSC and solubility investigation were used to study the crosslinking behavior of PES-OAllyl. After heat treatment, the glass transition temperature（Tg） value of PES-OAllyl sharply increased from 165 ℃ to 227 ℃. Meanwhile, PES-OAllyl changed from a soluble polymer to an insoluble thermoset. In addition, TGA（thermogravimetric analysis） result suggests that the thermal stability of the crosslinked product was improved. All the data prove that the crosslinked PES-OAllyl could be a potential solvent-resistance high-performance material.

关键词： Crosslinkable grafting reaction Poly(aryl ether sulfone)

Synthesis and Characterization of Poly (Methyl Methacrylate)/Polyethylenimine grafting Core-Shell Nanoparticles for CO₂ Adsorption Using Soap-Free Emulsion Copolymerization

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Advances in Materials Physics and Chemistry 2016年第7期6卷 220-229页

作者： Jun-Won Kook Ji Young Lee Ki Seob Hwang In Park Jung Hyun Kim Jun-Young Lee Department of Chemical and Biomolecular Engineering Yonsei University Seoul Republic of Korea IT Convergence Materials Group Korea Institute of Industrial Technology Cheonan Republic of Korea

Unlike previous emulsion polymerization, we used grafting reactions in soap-free emulsion systems. In this study, we synthesized grafted PMMA/PEI core-shell nanoparticles by varying the MMA/PEI content and molecular weight of PEI (Mn = 600, 8000, and 10,000). The size and morphology of the core-shell nanoparticles were characterized by a particle size analyzer and scanning electron microscopy. The nanoparticles were 178 - 408 nm in diameter and swelled in water or methanol by 30 - 75 nm. The size of the nanoparticles increased with MMA contents, whereas the size distribution progressively became homogeneous with increasing molecular weight of PEI. Lastly, we measured CO2 adsorption capacity of the grafted PMMA/PEI core-shell nanoparticles, and we found the capacity to be limited at a level of 0.69 mg, which occurred for nanoparticles prepared from emulsions at a pH value of 11.

关键词： Polyethylenimine Core-Shell Nanoparticle CO2 Adsorption grafting reaction Soap-Free Emulsion

Characterization and Catalytic Properties of Al-MCM-41 Mesoporous Materials Grafted with Tributyltin Chloride

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Chinese Journal of Chemical Engineering 2012年第5期20卷 900-905页

作者：宋伟明刘星荆涛邓启刚 College of Chemistry and Chemical Engineering Qiqihar University

Surface organometallic chemistry (SOMC) is a recently developing research field. It is of great significance for the quantitative modification, restoration of solid surface, identification of the physical and chemical nature of surface and the preparation of new catalyst. The production of R 3 Sn-O-MCM-41 (R 3 SnM) was obtained by heating tributyltin chloride and Al-MCM-41 mixture at 170 °C for 5 h under stirring in nitrogen atmosphere. The composition, structure and surface physical and chemical properties of the samples were characterized by inductively coupled plasma mass spectrometry (ICP-MS), 13 C, 119 Sn, 29 Si and 27 Al solid state NMR (nuclear magnetic resonance) spectra, in-situ pyridine infrared spectroscopy (Py-IR), N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), etc. The results of ICP and organic elemental analysis shows that the grafting yield w Sn was 6.46% for R 3 SnM. H 0 (the negative logarithm of the acid concentration)and the number of acid sites for R 3 SnM respectively were 2.77-0.99 and 4.8 mmol·g-1 by the Hammett method. N 2 adsorption-desorption, XRD, TEM analysis showed that R 3 SnM with ordered hexagonal mesopore structure, resulted in the decease of surface areas and pore size as well as the increase of mesoporous volume and surface acidity, as compared to Al-MCM-41. R 3 SnM was used in the synthesis of isoamyl acetate. The yield of isoamyl acetate was 96% when n(isoamyl alcohol)︰n(acetic acid) 1.0︰1.0, 3 R SnM w 5%, 138 °C for 5 h. The catalyst can be reused and the yield of 86% can be attained when catalyst was reused five times at the same catalytic conditions.

关键词： Al-MCM-41 molecular sieves tributyltin chloride grafting reaction characterization catalysis isoa-myl acetate

Synthesis, characterization of triphenyltin grafted on SBA-15mesoporous silica and its catalytic performance for the synthesis of 4-methylacetophenone

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Chinese Journal of Chemical Engineering 2015年第2期23卷 384-388页

作者：邓启刚覃志乐杨颖宋伟明 College of Chemistry and Chemical Engineering of Qiqihar University

The production of Ph3Sn–O–SBA-15(Ph3Sn SBA)was achieved by heating triphenyltin chloride and SBA-15in N-methylpyrrolidone at 190°C for 5 h using triethylamine as a *** composition,structure,and surface physical and chemical properties of Ph3Sn SBA were characterized using inductively coupled plasma-atomic emission spectroscopy(ICP-AES),13C,119Sn and29Si solid-state nuclear magnetic resonance(NMR)spectroscopy in situ pyridine infrared spectroscopy(Py-IR),N2adsorption–desorption isotherms,X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results of ICP-AES and organic elemental analysis showed that the grafting yield of Sn was 17%(by mass)for Ph3Sn *** elemental analysis and solid-state NMR results for Ph3Sn SBA were consistent with grafting of triphenyltin on *** N2adsorption–desorption,XRD and TEM analyses showed that Ph3Sn SBA retained an ordered hexagonal mesoporous structure,resulting in decreases in the surface area,pore size and mesopore volume,and an increase in acidity as compared with *** Hammett acidity function(H0)value and the number of acid sites for Ph3Sn SBA,obtained by the Hammett methods,were 2.77–3.30 and 2.07 mmol·g-1,*** Friedel–Crafts acylation of toluene and acetic anhydride over Ph3Sn SBA was *** yield of methylacetophenone(MAP)and the selectivity for 4-methylacetophenone(PMAP)were 79.56%and 97.12%,respectively,when the conditions were n(toluene):n(anhydride)=2.0:1.0 with 6%(by mass)catalyst,and heating under reflux for 5 *** PMAP selectivity still reached 93.11%when Ph3Sn SBA was used for the fifth time under the same reaction conditions.

关键词： SBA-15 Triphenyltin chloride grafting reaction Catalysis Friedel–Crafts