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《Chemical Journal of Chinese Universities》 2008-02
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Preparation of SiO_2/Graft Copolymer Hybrid Nanopartciles by RAFT Copolymerization

LIU Chun-Hua1,2,PAN Cai-Yuan1(1.Department of Polymer Science,University of Science & Technology of China,Hefei 230026,China;2.Department of Polymer Material Science and Engineering,Hefei University of Technology,Hefei 230009,China)  
By condensation reaction of the hydroxyl groups on the silica nanoparticle surface with coupling agent KH-560,epoxy groups were covalently attached to silica nanoparticles.The reversible addition-fragmentation chain transfer(RAFT)agent,dithiobenzoate,was anchored on the surface of the silica nanoparticles by the reaction of carboxylic acid in the RAFT agent,carboxypropyl dithiobenzoate with the epoxy group.The resultant RAFT agent was used in the surface RAFT copolymerization of styrene(St)and maleic anhydride(MAh)at room temperature,and SiO_2/poly(St-alt-MAh)hybrid materials were obtained.Since MAh is highly reactive,poly(ethylene oxide)methyl ether(MPEO)was grafted onto the copolymers on the surface of particles via reaction of hydroxyl group in MPEO with MAh,forming SiO_2/P[St-alt-(MAh-g-PEO)] composite particles.The composition,structure and morphology of the composite particles were confirmed via FTIR,TGA and TEM.This provides a new approach to graft biocompatible and hydrophilic PEO onto silica particles.
【Fund】: 国家自然科学基金(批准号:50673086)资助
【CateGory Index】: O631.3;TB383.1
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