1992•Makromolekulare Chemie Macromolecular SymposiaOpen access

Quasi‐chemical approximation for nonrandomness in the hole theory of polymeric systems: Application to homopolymer/random copolymer blends

Hankun Xie, Erík Nies

Abstract

Abstract The non‐random‐mixing version of the Holey‐Huggins theory is used to extract molecular parameters from the experimental equation of state data of polystyrene, poly(p‐bromostyrene) and a random copolymer poly(styrene‐co‐p‐bromostyrene) of known composition. With these parameters upper critical miscibility behavior, in qualitative agreement with experimental observations, is predicted for the system poly(styrene‐co‐p‐bromostyrene)/polystyrene. Quantitative agreement can be obtained for the equation of state and miscibility behavior if small changes in the values of the cross parameters are allowed.

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Available abstract

Key concepts: Miscibility, Copolymer, Polystyrene, Styrene, Materials science, Flory–Huggins solution theory, Polymer chemistry, Random phase approximation