Stimuli Responsive Poly(1-[11-acryloylundecyl]-3-methyl-imidazolium bromide): Dewetting and Nanoparticle Condensation Phenomena

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• 作者：Xiumin Ma ; Md. Ashaduzzaman ; Masashi Kunitake ; Rene Crombez ; John Texter ; Lisa Slater ; Thomas Mourey
• 刊名：Langmuir
• 出版年：2011
• 出版时间：June 7, 2011
• 年：2011
• 卷：27
• 期：11
• 页码：7148-7157
• 全文大小：1033K
• 年卷期：v.27,no.11(June 7, 2011)
• ISSN：1520-5827

文摘

A stimuli-responsive homopolymer poly(ILBr) is fabricated via a 鈥渢wo-phase鈥?atom transfer radical polymerization (ATRP) process, where ILBr stands for the reactive ionic liquid surfactant, 1-[11-acryloylundecyl]-3-methyl-imidazolium bromide. An extraordinarily wide molecular weight distribution (PDI = 6.0) was obtained by introducing the initiator (4-bromomethyl methyl benzoate) in a heterogeneous two-phase process. The molecular weight distribution of poly(ILBr) was characterized by size-exclusion chromatography (SEC). The resulting homopolymer was found to be surface active and stimuli responsive. Poly(ILBr) films coated on quartz exhibit stimuli-responsive dewetting after ion exchange of Br^{鈭?/sup> by PF₆鈭?/sup>. This dewetting phenomenon can be understood in chain segmental terms as a stimuli-induced structural relaxation and appears to be the first such reported stimuli-responsive polymeric dewetting. Titrating aqueous poly(ILBr) with aqueous bis(2-ethylhexyl)sulfosuccinate induces nanophase separation and results in the condensation of nanoparticles 30鈭?0 nm in diameter.}