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Synthesis and characterization of well-defined poly(2-hydroxyethyl methacrylate-co-styrene)-graft-poly(ε-caprolactone) by sequential controlled polymerization

Authors

  • Xuewei Xu,

    1. Department of Macromolecular Science, Fudan University, The Key Open Laboratory of Molecular Engineering of Polymer, State Education Ministry of China, Shanghai, China
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  • Junlian Huang

    Corresponding author
    1. Department of Macromolecular Science, Fudan University, The Key Open Laboratory of Molecular Engineering of Polymer, State Education Ministry of China, Shanghai, China
    • Department of Macromolecular Science, Fudan University, The Key Open Laboratory of Molecular Engineering of Polymer, State Education Ministry of China, Shanghai, China
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Abstract

A new graft copolymer, poly(2-hydroxyethyl methacrylate-co-styrene) -graft-poly(ϵ-caprolactone), was prepared by combination of reversible addition-fragmentation chain transfer polymerization (RAFT) with coordination-insertion ring-opening polymerization (ROP). The copolymerization of styrene (St) and 2-hydroxyethyl methacrylate (HEMA) was carried out at 60 °C in the presence of 2-phenylprop-2-yl dithiobenzoate (PPDTB) using AIBN as initiator. The molecular weight of poly (2-hydroxyethyl methacrylate-co-styrene) [poly(HEMA-co-St)] increased with the monomer conversion, and the molecular weight distribution was in the range of 1.09 ∼ 1.39. The ring-opening polymerization (ROP) of ϵ-caprolactone was then initiated by the hydroxyl groups of the poly(HEMA-co-St) precursors in the presence of stannous octoate (Sn(Oct)2). GPC and 1H-NMR data demonstrated the polymerization courses are under control, and nearly all hydroxyl groups took part in the initiation. The efficiency of grafting was very high. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 5523–5529, 2004

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