MISCIBILITY OF POLYHYDROXY ETHER OF BISPHENOL-A WITH ETHYLENE TEREPHTHALATE-CAPROLACTONE COPOLYESTERS

Blends of the polyhydroxyether of bisphenol-A (Phenoxy) and a series o f ethylene terephthalate (ET)-caprolactone (CL) random copolyesters (T CL) having different ET contents were examined mainly by differential scanning calorimeter (DSC). A miscibility limit specified by the ET co ntent was obtained and estimated to be about 90 wt%. When the ET conte nt is less than this limit, the Phenoxy and copolyesters are miscible with each other. A relatively stronger specific intermolecular interac tion between Phenoxy and copolyester was detected by Fourier Transform infra-red (FTIR) spectroscopy, and it may be an important factor whic h affects the miscibility in these blends. Based on the miscibility be haviour of Phenoxy/TCL copolyester blends, the factors which affect th e miscibility of Phenoxy with polyester was discussed.