Reversible Hydrogels from an Ampholytic An(B-b-C)n Heteroarm Star Block Terpolymer

被引：11

作者：

Stavrouli, Nikoletta ^{[1
]}

Kyriazis, Apostolos ^{[1
]}

Tsitsilianis, Constantinos ^{[1
]}

机构：

[1] Univ Patras, Inst Chem Engn & High Temp Chem Proc, ICE HT 4, Patras 26504, Greece

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2008年 / 209卷 / 21期

关键词：

block copolymers; hydrogels; rheology; star polymers; synthesis;

D O I：

10.1002/macp.200800287

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

An asymmetric, amphiphilic, A(n)(B-b-C)(n) heteroarm star block terpolymer bearing polystyrene and poly(2-vinyl pyridine)-block-poly(acrylic acid) arms, was synthesized by anionic polymerization, using an extending "in-out" method and a post polymerization deprotection reaction. Due to the pH-dependent protonation/deprotonation equilibrium of the P2VP/PAA blocks, a rich phase behavior was observed as a function of pH. At pH = 2, the star terpolymers form a physical hydrogel through a solvent-induced sol/gel transition in a DMF/water solvent mixture. The gelation mechanism was attributed to a jamming effect mediated by increasing the dielectric permittivity of the medium.

引用

页码：2241 / 2247

页数：7

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