Abstract
The miscibility of bisphenol A polycarbonate (PC) and poly(ethylene terephthalate−co−1,4-dimethyl cyclohexane terephthalate) copolyesters (PECT) containing various amount of 1,4-dimethyl cyclohexane were explored to produce a blend having optical-grade clarity. It is known that PC does not form miscible blends with poly(ethylene−terephthalate) (PET), while it forms a miscible blend with poly(1,4-dimethyl cyclohexane terephthalate) (PCT). PC blends with PECT copolyesters prepared by solvent casting were not miscible regardless of the copolyester composition. However, PC and PECT copolyesters containing 1,4-dimethyl cyclohexane from 32 to 80 mol % formed homogeneous mixtures upon heating. Since immiscibility of solvent casting samples can be driven by solvent effects even though PC/PECT binary blends are miscible, upper critical solution temperature (UCST) type phase behavior was confirmed by exploring phase reversibility. The phase homogenizing temperature of PC/PECT blends exhibiting UCST-type phase behav...
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