Micellar solutions of associative triblock copolymers: Entropic attraction and gas-liquid transition

被引：132

作者：

Pham, QT

Russel, WB ^{[1
]}

Thibeault, JC

Lau, W

机构：

[1] Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA

[2] Rohm & Haas Co, Res Labs, Spring House, PA 19477 USA

来源：

MACROMOLECULES | 1999年 / 32卷 / 09期

关键词：

D O I：

10.1021/ma982007v

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We report the first clear observations of an entropy-driven phase transition between a dilute micellar "gas" and a disordered but highly associated micellar "liquid" realized with aqueous solutions of poly(ethylene oxide) chains fully end-capped with C-16 and C-18 hydrophobes. Dynamic light scattering and capillary viscometry determine the radii and aggregation numbers of the micelles and, together with the coexisting concentrations, permit estimates of the strength of the entropic attraction through the adhesive hard-sphere model. The behavior is qualitatively consistent with expectations for the entropy gain from the exchange of end blocks between cores of flowerlike micelles consisting of associative triblock copolymers.

引用

页码：2996 / 3005

页数：10

共 35 条

[11] A NEW APPROACH TO THE THEORY OF RELAXING POLYMERIC MEDIA [J].