Study on Star-Shaped Block Copolymers Prepared by Aqueous Photoinitiated Dispersion Polymerization
Core-crosslinked star shaped(CCS)polymer was synthesized by reversible addition-fragmentation chain transfer polymerization(RAFT),and star-shaped block copolymer was further prepared.The effects of crosslinking degree(DP)of CCS polymer,hydroxypropyl methacrylate(HPMA)concentration and the ratio of HPMA to CCS polymer substance on the in-situ self-assembly behavior of star-shaped block polymer were studied.The results show that the relative molecular weight distribution of the obtained CCS polymer is relatively narrow.As the DP of CCS polymer increases,the surface roughness of star shaped block copolymer spherical nanoparticles gradually increases.When CCS polymer is used to regulate the aqueous phase photo induced RAFT dispersion polymerization of HPMA,the overall reaction rate is significantly higher than that of linear polymer.
core-crosslinked star-shaped polymerpolymerization-induced self-assemblyreversible addition-fragmentation chain transfer dispersion polymerization
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