Reactive blending of poly(ethylene terephthalate) and polycarbonate, 2. A novel route to copoly(ester‐ether)s

Copoly(ester‐ether)s have been prepared by reacting poly(ethylene terephtalate) (PET) and bisphenol A polycarbonate (PC) at high temperature, under vacuum, in the presence cf titanium tetrabutoxide as catalyst. The polymeric materials obtained in this way, which contain terephthalate, bisphenol A and ethylene glycol moieties, are the result of exchange reactions followed by the elimination of cyclic ethylene carbonate and by a decarboxylation reaction. These copolymers have a higher glass transition temperature and thermal resistance than PET, and a better solvent resistance than PC; their dynamic mechanical spectra are similar to that of PC in the −150 to +50°C temperature range.