Synthesis and physico-chemical properties of copoly(ester-sulfonates) of 1,1′-bis (3-methyl-4-hydroxy phenyl) cyclohexane with 2,4-toluene disulfonyl and terephthaloyl chlorides

Copoly(ester-sulfonates) of varying compositions have been synthesized by interfacial polycondensation technique by using H2O–CHCl3 as an interphase, alkali as an acid acceptor and sodium lauryl sulfate-cetyl trimethyl ammonium bromide as mixed emulsifiers at 0 °C for 412 h. Copolymers are characterized by IR and NMR spectral data, viscosity in three different solvents at three temperatures and little solvent and temperature effect is found on [η]; and density (1.3430–1.3406 g/cm3) by floatation method. Copolymers possess excellent solubility in common solvents and chemical resistance against water, acids, alkalis and salts. They possess moderate to good tensile strength (10.6–79.5 N/mm2), excellent volume resistivity (7.5–28 × 1016 Ω cm), electric strength (53–118 kV/mm) and dielectric constant (1.3–1.58). They are thermally stable up to about 349–373 °C in an N2 atmosphere and possess high Tg (136–196 °C). DTA endo/exothermic transitions supported either decomposition or formation of new product(s). Physical properties of copolymers are improved with increasing terephthlate content.