Controlling the Dynamics of Self-Assembled Triblock Copolymer Networks via the pH

被引：78

作者：

Charbonneau, Celine ^{[1
]}

Chassenieux, Christophe ^{[1
]}

Colombani, Olivier ^{[1
]}

Nicolai, Taco ^{[1
]}

机构：

[1] Univ Maine, LUNAM Univ, Lab Polymeres Colloides & Interfaces, UMR CNRS 6120, F-72085 Le Mans 9, France

来源：

MACROMOLECULES | 2011年 / 44卷 / 11期

关键词：

AMPHIPHILIC DIBLOCK COPOLYMERS; OXIDE)-POLY(PROPYLENE OXIDE)-POLY(ETHYLENE OXIDE); KINETICALLY FROZEN COLLOIDS; BLOCK-COPOLYMERS; ASSOCIATING POLYMERS; RHEOLOGICAL PROPERTIES; REVERSIBLE HYDROGELS; BUTYL ACRYLATE; MICELLES; POLYELECTROLYTE;

D O I：

10.1021/ma2002382

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

Triblock copolymers were synthesized by ATRP with a poly(acrylic acid) (PAA) central block and random copolymer end blocks containing both AA and n-butyl acrylate (nBA) units. Self-assembly in aqueous solution was investigated over a wide range of concentrations. The degree of ionization of the AA units (alpha) was varied between 0.1 and 0.9 by varying the pH. The dynamic mechanical properties of the systems were investigated using oscillatory shear measurements. With increasing pH a transition from frozen hydrogels to dynamic networks was observed at pH = 5.2 (alpha = 0.30). The dynamic polymer networks behaved as viscoelastic liquids with a terminal relaxation time that decreased over 7 decades with increasing pH. This remarkable feature enables fine-tuning and control of the rheology.

引用

页码：4487 / 4495

页数：9

共 60 条

[1]

POLY(ETHYLENE OXIDE)-POLY(PROPYLENE OXIDE)-POLY(ETHYLENE OXIDE) BLOCK-COPOLYMER SURFACTANTS IN AQUEOUS-SOLUTIONS AND AT INTERFACES - THERMODYNAMICS, STRUCTURE, DYNAMICS, AND MODELING [J].