Synthesis of poly(4-vinyl pyridine-b-methyl methacrylate) by MAMA-SG1 initiated sequential polymerization and formation of metal loaded block copolymer inverse micelles

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• 作者：Nurulsaidah Abdul Rahim^a ; ^b ; Fabrice Audouin^a ; Brendan Twamley^a ; Johannes G. Vos^a ; Andreas Heise^a ; ^{andreas.heise@dcu.ie}
• 关键词：Controlled radical polymerization ; Nitroxide mediated polymerization ; Block copolymers ; Micelles ; MAMA-SG1 ; Vinylpyridine
• 刊名：European Polymer Journal
• 出版年：2012
• 期刊代码：35_00143057
• 类别：ms
• 出版时间：May, 2012
• 卷：48
• 期：5
• 页码：990-996
• 文件大小：613 K

摘要

Well-defined poly(4-vinylpyridine) (P4VP) was synthesised by nitroxide-mediated radical polymerization using the BlocBuilder MAMA-SG1. The controlled character of the polymerization was confirmed by kinetic measurements and linear increase of the molar mass with monomer conversion. Poly(4-vinylpyridine) terminated with SG1 was then used as macroinitiator and chain extended to form poly(4-vinylpyridine-b-methyl methacrylate) and poly(4-vinylpyridine-b-(methyl methacrylate-co-styrene)) block copolymers. These block copolymers spontaneously organized into spherical inverse micelles in THF with critical micelle concentrations of 0.1 mg/mL for poly(4VP₁₉₀-b-MMA₉₁) and 0.01 mg/mL for poly(4VP₁₉₀-b-(MMA₅₇-co-S₁₈)) and sizes of 70 and 130 nm (DLS), respectively. The inverse micelles were loaded with copper(II)acetate leading to a slight increase in micelle size. The uniform structure of the inverse micelles was confirmed by FeSEM images, while the presence of copper in the micelle core was established by energy-dispersive X-ray spectroscopy (EDX) and FTIR spectroscopy.