Phase equilibria of quasi-binary systems consisting of multicomponent polymers 1 and 2. IV: Poly(ethylene oxide)/poly(propylene oxide) systems |
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| Authors: | Hironobu Shirataki Kenji Kamide |
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| Affiliation: | 1. Fundamental Research Laboratory of Natural and Synthetic Polymers, Asahi Chemical Industry Co. Ltd, 11-7, Hacchonawate, Takatsuki, Osaka 569, Japan;2. Laboratory of Clothing, Faculty of Education, Kumamoto University, Kurokami 2-40-1, Kumamoto 860, Japan |
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| Abstract: | To confirm the reliability of the theory of phase equibria of multicomponent polymer 1/multicomponent polymer 2 systems (i.e. quasi-binary systems) and the method of computer experiment based on this theory (Brit. Polym. J., 23 (1990)285; 23 (1990)299; Polym. Int., 29 (1992)219), could point curves (CPC), two-phase volume ratios ( R ) and critical solution points (CSP) have been determined experimentally for the quasi-binary mixtures of poly(ethylene oxide) (M¯w = 647, M¯w/M¯n = 1.15; M¯w and M¯n, the weight-average and numberaverage molecular weights, respectively) and poly(propylene oxide) (M¯w = 2028, M¯w/M¯n = 1.08; and Mw = 2987, Mw/Mn = 1.13). The hydroxyl end groups of both polymers were methoxylated in advance by the Cooper & Booth method (Polymer, 18 (1977)164). The thermodynamic interaction parameter between both polymers, χ12, and the concentration dependence parameters for the above quasi-binary systems were determined by the method proposed in a previous paper (Brit. Polym. J., 23 (1990)299). CPC, R and CSP values calculated on the basis of the theory are in good agreement with the values determined experimentally. |
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| Keywords: | polymer blend cloud point curve critical solution point phase volume ratio χ12 parameter modified Flory–Huggins theory |
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