Liquid-Liquid Equilibrium of Copolymer Solutions with Broad and Asymmetric Chemical Distributions
作者:
Margit T. Rätzsch,
Dieter Browarzik,
Horst Kehlen,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1990)
卷期:
Volume 27,
issue 7
页码: 809-830
ISSN:0022-233X
年代: 1990
DOI:10.1080/10601329008544807
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A solution of a random copolymer showing polydispersity only with respect to chemical composition is considered. A model distribution very flexible in its breadth and in its asymmetry is used to describe the polydispersity. Based on continuous thermodynamics, equations for the cloud-point curve, the shadow curve, the spinodal, the critical point, and the heterogeneous double critical point are derived. the activity coefficients are calculated with the aid of Huggins' χ-parameter concept assuming χ to depend linearly on the average chemical composition of the copolymer. the influence of the breadth and the asymmetry of the distribution on the liquid-liquid equilibrium of the copolymer solution is discussed.
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