Abstract
The miscibility of ethylene terephthalate (ET)-caprolactone (TCL) copolyester blends with polycarbonate has been studied by differential scanning calorimetry (d.s.c.). When ET content in the copolyesters is less than 60%, they are miscible with polycarbonate. Such a miscibility window cannot be predicted by the Flory-Huggins theory. The ratio of the glass transition temperatures T g A T g B has been used to characterize some non-combinatorial entropic contribution which is connected with interaction parameter χ 1. Using the method suggested by Coleman, the total interaction parameter χ = χ 0 + χ 1 ( χ 0 is the Flory-Higgins interaction parameter) is plotted against the molar volume fraction of ester groups in the TCL copolyesters. The miscibility range determined in this way conforms with the results of d.s.c. experiments.
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