AbstractThe kinetics of polycondensation and copolycondensation of terephthaloyl chloride with numerous bisphenols in α‐chloronaphthalene solutions were examined. The values of activation energyEof the polycondensation processes were calculated. Isokinetic temperatures for different systems of monomers were determined. A series of syntheses of copolyesters at isokinetic temperature and other temperatures was carried out. The products obtained during the reaction were examined. It was found that at isokinetic temperature the composition of the products is independent of the extent of reaction, whereas at other temperatures it depends on the reactivity ratio of monomers used, as well as on the extent of reacti
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