Thermodynamic properties of some concentrated polymer solutions
作者:
D. C. Bonner,
J. M. Prausnitz,
期刊:
Journal of Polymer Science: Polymer Physics Edition
(WILEY Available online 1974)
卷期:
Volume 12,
issue 1
页码: 51-73
ISSN:0098-1273
年代: 1974
DOI:10.1002/pol.1974.180120105
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractSolubilities of several solvents were measured in four molten polymers by using an isobaric vapor‐pressure apparatus. Solvent concentration ranged from 0.5 to 15 wt‐%. The systems polyisoprene–benzene and polyisobutylene–benzene were studied at 80.0°C; polyisobutylene–cyclohexane was studied at 100.0°C; ethylene–vinyl acetate copolymer (EVA)–cyclohexane, EVA–isooctane, and poly(vinyl acetate)–isooctane were studied at 110.0°C. Of six polymer–solvent systems studied, all except poly(vinyl acetate)–isooctane appear to exhibit hysteresis in a single sorption–desorption cycle starting with dry polymer. The desorption curves of solvent activity plotted versus solvent weight fraction show an inflection point, suggesting localized adsorption of solvent molecules. Experimental data were analyzed with a theory which takes into account adsorption of solvent by polymer in addition to differences in free volumes and intermolecular forces. The theory gives a semiquantitative representatio
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