In the present work, the miscibility of a series of ethylene terephtha
late(ET)-caprolactone(CL) random copolyesters(TCL) having different ET
contents blend with polycaprolactone(PCL), polycarbonate(PC) and phen
oxy resin(PH) was examined by DSC, and the miscibiiity limits specifie
d by the ET content in TCL were found in these blends. Based on the ex
perimental miscibility in these blends and the mean field binary inter
action model, the interaction parameters of the PET/PC and PET/PH blen
ds were obtained.