Amphiphilic star block copolymers: Influence of branching on lyotropic/interfacial properties

被引：12
|
作者：
Wang, Lei [1 ]
Hu, Ping [1 ]
Tirelli, Nicola [1 ]
机构：
[1] Univ Manchester, Sch Pharm & Pharmaceut Sci, Manchester M13 9PT, Lancs, England
来源：
POLYMER | 2009年 / 50卷 / 13期
基金：
英国工程与自然科学研究理事会;
关键词：
Amphiphilic block copolymers; Star polymers; Lyotropic phases; POLY(ETHYLENE GLYCOL); POLY(PROPYLENE SULFIDE); RADICAL POLYMERIZATION; AGGREGATION BEHAVIOR; DIBLOCK COPOLYMER; PROPYLENE SULFIDE; SURFACE BEHAVIOR; OXIDE); ARCHITECTURES; TRIBLOCK;
D O I：
10.1016/j.polymer.2009.04.035
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
How can the degree of branching influence the lyotropic properties of amphiphilic block copolymers? In order to provide a qualitative answer to this question, we have prepared a library of poly(propylene sulfide)-bl-poly(ethylene glycol) (PPS-PEG) block copolymers, varying the hydrophobic block (PPS) length and its branching degree and thus producing diblock, triblock (that can be seen as two-armed star), tri-armed star and tetra-armed star structures. The PEG block, on the contrary, was kept constant (linear PEG2000). Although all the polymers exhibited a qualitatively similar lyotropic behaviour, an increased degree of branching of the hydrophobic block caused clear differences in the rheology of lyotropic phases, with an increasingly softer character, and in the organisation of the PEG chains, which appeared to adopt possibly more extended and dehydrated conformations. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved
引用
收藏
页码：2863 / 2873
页数：11
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