Preparation of SiO2/Graft Copolymer Hybrid Nanopartciles by RAFT Copolymerization

Chem. J. Chinese Universities

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Preparation of SiO₂/Graft Copolymer Hybrid Nanopartciles by RAFT Copolymerization

LIU Chun-Hua^1,2, 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

Received:2007-09-11 Revised:1900-01-01 Online:2008-02-10 Published:2008-02-10
Contact: PAN Cai-Yuan

Abstract

Abstract: 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 SiO₂/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 SiO₂/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.

Key words: Silica particle, Surface RAFT polymerization, Styrene, Maleic anhydride, Poly(oxide ethylene)

CLC Number:

O633.11

TrendMD:

LIU Chun-Hua^1,2, PAN Cai-Yuan¹*. Preparation of SiO₂/Graft Copolymer Hybrid Nanopartciles by RAFT Copolymerization[J]. Chem. J. Chinese Universities, doi: .

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Preparation of SiO₂/Graft Copolymer Hybrid Nanopartciles by RAFT Copolymerization

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