LINEAR POLYTHIOESTERS .33. PRODUCTS OF INTERFACIAL POLYCONDENSATION OF 4,4'-DIMERCAPTOBIPHENYL WITH ACID DICHLORIDES

New polythioesters were obtained by interfacial polycondensation of 4, 4'-dimercaptobiphenyl with selected aliphatic and isomeric phthaloyl d ichlorides. To determine the optimum polycondensation conditions, the influence of the following factors on reduced viscosity and yield were studied: type of organic phase, concentration of hydrogen chloride ac ceptor, type of catalyst, reaction temperature and rate of acid dichlo ride addition. A thorough examination was carried out only for the pol ycondensation of dithiol with isophthaloyl dichloride chosen as a mode l system. The structures of polythioesters were determined by elementa l analysis, X-ray and infrared spectra. The temperature of initial dec omposition, the percentage of its mass loss, and temperature of the fa stest decomposition process were determined from curves of differentia l and thermogravimetric analysis. Some physicochemical, mechanical and electrical properties were determined. The molecular weights were not measured because of the low solubility of the obtained polythioesters .