Cationic Telechelic Polyelectrolytes: Synthesis by Group Transfer Polymerization and Self-Organization in Aqueous Media
Cationic Telechelic Polyelectrolytes: Synthesis by Group Transfer Polymerization and Self-Organization in Aqueous Media
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DOI：
10.1021/ma051592e
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发表时间：
2006
期刊：
影响因子：
5.5
通讯作者：
G. Gotzamanis;C. Tsitsilianis;Stella C. Hadjiyannakou;C. S. Patrickios;Robert Lupitskyy;S. Minko
中科院分区：
文献类型：
--
作者：
G. Gotzamanis;C. Tsitsilianis;Stella C. Hadjiyannakou;C. S. Patrickios;Robert Lupitskyy;S. Minko
ABA triblock copolymers comprising a relative long poly(2-(dimethylamino)ethyl methacrylate) end-capped by short poly(methyl methacrylate) blocks (PMMA-b-PDMAEMA-b-PMMA) were synthesized using group transfer polymerization (GTP), and their aqueous solution properties were explored in aqueous media. At low pH these copolymers behaved as cationic telechelic polyelectrolytes (TP) and were self-organized through hydrophobic interactions among the PMMA blocks (stickers). Two types of associates were observed by atomic force microscopy (AFM) at very low concentrations: end-to-end linear associates and star like "hairy" loose aggregates where the one end of the TP was located in an irregular hydrophobic core and the other remained as a dangling end (absence of looping chains). By increasing the concentration, finite size clusters (microgels) were formed, the size of which changed continuously, leading eventually to the formation of an infinite transient network. All the structures were visualized by AFM with molecular resolution.
