Abstract
DSC was used to study the phase behavior in binary blends of copolymers containing the same monomer units, but differing in composition. Examples are chlorinated poly(vinyl chloride) (CPVC), copolymers of methyl and ethyl methacrylate (MMA-EMA), and chlorinated polyethylene (CPE). It was found that in the first two systems miscibility can be described in terms of simple mean-field theory for random copolymer blends. In contrast, the miscibility boundaries in the CPE system display deviations from the first-order mean-field theory, which is interpreted in terms of a sequence distribution effect
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