共聚物
链式转移
高分子化学
聚合
溴化物
离子液体
单体
化学
木筏
无机化学
自由基聚合
催化作用
有机化学
聚合物
作者
Hideharu Mori,Masahito Yahagi,Takeshi Endō
出处
期刊:Macromolecules
[American Chemical Society]
日期:2009-11-10
卷期号:42 (21): 8082-8092
被引量:183
摘要
The polymerizations of N-vinylimidazolium salts, 1-(3-phenylpropyl)-3-vinylimidazolium bromide (PVI-Br), 1-(6-ethoxycarbonylhexyl)-3-vinylimidazolium bromide (EHVI-Br), and 1-(2-ethoxyethyl)-3-vinylimidazolium bromide (EtOEVI-Br), were performed by reversible addition−fragmentation chain transfer (RAFT)/macromolecular design via interchange of xanthate (MADIX) process. Two xanthate-type chain transfer agents (CTAs), O-ethyl-S-(1-phenylethyl) dithiocarbonate (CTA 1) and O-ethyl-S-(1-ethoxycarbonyl) ethyldithiocarbonate (CTA 2), proved efficient for obtaining poly(PVI-Br)s and (EHVI-Br)s with relatively low polydispersities (Mw/Mn < 1.4). Poly(EtOEVI-Br)s with moderate molecular weight distributions (Mw/Mn = 1.5−1.6) were also obtained under the same conditions. Controlled character of the polymerization of PVI-Br was confirmed by the molecular weight controlled by the monomer/CTA molar ratio, a linear increase in the number-average molecular weight (Mn) with conversion, and the ability to extend the chain by a second addition of monomer. Polymerizations of the N-vinylimidazolium salts using the dithiocarbonate-terminated poly(N-isopropylacrylamide) as a macro-chain-transfer agent provided well-defined thermoresponsive ionic liquid block copolymers. Thermally induced phase separation behavior and assembled structures of the block copolymers were also studied in aqueous solution.
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