Behavior of Temperature Dependence of χ Parameter in Random Copolymer Blends Showing an Immiscibility Window View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1997-05

AUTHORS

Tsukasa Sato, Masato Suzuki, Masao Tohyama, Masaki Endo, Tomoo Shiomi, Kiyokazu Imai

ABSTRACT

Previously miscibility for the blends of poly(vinyl chloride-stat-vinyl acetate) (VCVAc90, containing 90 wt% of VC) with poly(isobutyl methacrylate-stat-n-butyl methacrylate) (iBMAnBMA) was found to be like a so-called immiscibility window. In this work, the temperature dependence of the Flory-Huggins χ parameter was calculated for the VCVAc90/iBMAnBMA blends using the Flory-type equation-of-state theory extended to random copolymer systems. The equation-of-state parameters necessary for calculation of χ was determined using the experimental results of osmotic pressures and heats of mixing for solutions of these polymers in cyclohexanone (CHN). The temperature dependence of χ was a monotonically increasing function over all the copolymer compositions of iBMAnBMA copolymers, and there existed a range of copolymer compositions in which χ for the copolymer blends VCVAc90/iBMAnBMA was positive though χs for both homopolymer blends VCVAc90/PiBMA and VCVAc90/PnBMA (where VCVAc90 was regarded as a homopolymer) were negative. This corresponds qualitatively to miscibility behavior observed for the present copolymer blends. It was concluded that miscibility behavior in the present copolymer blends is one of two types of immiscibility windows classified previously by us. More... »

PAGES

417-422

Identifiers

URI

http://scigraph.springernature.com/pub.10.1295/polymj.29.417

DOI

http://dx.doi.org/10.1295/polymj.29.417

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037570923


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