Phase Behavior of Polycarbonate Blends with Selected Halogenated Polymers

摘要

Miscibility of polymer-polymer mixtures is normally the result of an exothermic heat of mixing since the entropy of mixing is too small to be a significant factor in blend phase behavior. The interactions responsible for exothermic mixing are complex and usually cannot be predicted a priori; however, as more information on blend miscibility becomes available, patterns become evident which may lead to logical speculation about the phase behavior of related systems. For example, a variety of halogenated polymers are noted to be miscible with some members of the homologous series of aliphatic polyesters, polyacrylates, or polymethacrylates. Bispheol A polycarbonate is shown to be miscible with a vinylidene chloride based polymer containing 13.5% by weight of vinyl chloride. On the other hand, polycarbonate is found to be immiscible with poly(vinyl chloride), poly(vinylidene fluoride), and polyepichlorohydrin.