LCST and UCST behavior in polymer solutions and blends

被引：67

作者：

Clark, E. A. ^{[1
]}

Lipson, J. E. G. ^{[1
]}

机构：

[1] Dartmouth Coll, Burke Lab 6128, Hanover, NH 03755 USA

来源：

POLYMER | 2012年 / 53卷 / 02期

基金：

美国国家科学基金会;

关键词：

Star PS; UCST and LCST; Liquid-liquid phase separation; CRITICAL SOLUTION TEMPERATURES; LIQUID-LIQUID EQUILIBRIA; EQUATION-OF-STATE; CLOUD-POINT CURVES; STATISTICAL THERMODYNAMICS; PHASE-BEHAVIOR; LATTICE MIXTURES; POLYSTYRENE; MISCIBILITY; MODEL;

D O I：

10.1016/j.polymer.2011.11.045

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 introduce a model for polymer solutions and blends that display both an upper and a lower critical solution temperature (UCST, LCST). Using our simple analytic lattice theory along with a fixed parameter set independent of both composition and temperature, we study solutions and blends exhibiting complicated miscibility patterns, including cases in which a UCST is below an LCST, or above. With respect to the former, we examine the conditions under which a so-called hourglass phase diagram may evolve. Where possible we compare directly with experiment, however, we also explore the behaviour of a number of hypothetical solutions and blends. One experimental solution of particular interest comprises star polystyrene (PS) and cyclohexane: in this case we supply what we believe are the only measured pressure-volume-temperature data for a high molecular weight (5.2 x 10(5) g/mol) star PS. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：536 / 545

页数：10

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