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Perfluorocyclobutyl‐containing Amphiphilic Block Copolymers Synthesized by RAFT Polymerization
Author(s) -
Chen Yongjun,
Zhang Sen,
Feng Chun,
Zhang Yaqin,
Li Qingnuan,
Li Wenxin,
Huang Xiaoyu
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990379
Subject(s) - chain transfer , chemistry , reversible addition−fragmentation chain transfer polymerization , polymer chemistry , polymerization , copolymer , living polymerization , radical polymerization , acrylate , monomer , raft , dispersity , chain growth polymerization , living free radical polymerization , amphiphile , ethylene glycol , bulk polymerization , polymer , organic chemistry
Amphiphilic block copolymers containing hydrophobic perfluorocyclobutyl‐based (PFCB) polyacrylate and hydrophilic poly(ethylene glycol) (PEG) segments were prepared via reversible addition‐fragmentation chain transfer (RAFT) polymerization. The PFCB‐containing acrylate monomer, p ‐(2‐( p ‐tolyloxy)perfluorocyclobutoxy)‐phenyl acrylate, was first synthesized from commercially available compounds in good yields, and this kind of acrylate monomer can be homopolymerized by free radical polymerization or RAFT polymerization. Kinetic study showed the 2,2′‐azobis(isobutyronitrile) (AIBN) initiated and cumyl dithiobenzoate (CDB) mediated RAFT polymerization was in a living fashion, as suggested by the fact that the number‐average molecular weights ( M n ) increased linearly with the conversions of the monomer, while the polydispersity indices kept less than 1.10. The block polymers with narrow molecular weight distributions ( M w / M n ≦1.21) were prepared through RAFT polymerization using PEG monomethyl ether capped with 4‐cyanopentanoic acid dithiobenzoate end group as the macro chain transfer agent (mPEG‐CTA). The length of the hydrophobic segment can be tuned by the feed ratio of the PFCB‐based acrylate monomer and the extending of the polymerization time. The micellization behavior of the block copolymers in aqueous media was investigated by the fluorescence probe technique.