Evaluation of thermodynamic parameters for blends of polyethersulfone and poly(methyl methacrylate) or polystyrene in dimethylformamide

被引：25

作者：

Gomez, CM ^{[1
]}

Figueruelo, JE ^{[1
]}

Campos, A ^{[1
]}

机构：

[1] Univ Valencia, Dept Quim Fis, E-46100 Burjassot, Valencia, Spain

来源：

POLYMER | 1998年 / 39卷 / 17期

关键词：

phase separation; interaction parameter; quasi ternary polymer solutions;

D O I：

10.1016/S0032-3861(97)10369-X

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Liquid-liquid phase separation phenomena have been investigated for a ternary system containing two polymers and a solvent. Namely, dimethylformamide (DMF)/polyethersulfone (PES)/poly(methyl methacrylate) (PMMA) and DMF/PES/Polystyrene (PS). The composition of the three components in the two phases in equilibrium has been determined by size exclusion chromatographic (s.e.c.) analysis. The lattice-based mean-held theory, first developed by Flory and Huggins, has been modified to adequately describe these systems. In this respect, we have assumed that the parameters depend on the polymer concentration, and we have included a ternary parameter. The phase equilibrium compositions have been used as input data to solve a set of equations raised following four different approximations mainly concerned with the composition dependence of the interaction parameters. Values of the Gibbs free energy of mixing as a function of the blend composition were also evaluated and discussed in terms of the blend stability. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.

引用

页码：4023 / 4032

页数：10

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