Abstract
Two new series of poly(imide-ester)s and poly(imide-urethane)s have been synthesized from various N,N′-bis(ω-hydroxyalkyl)pyromellitimides (HAPMIs). The poly(imide-ester)s were prepared from terephthalic acid with HAPMIs by melt polycondensation while poly(imide-urethane)s were obtained from HAPMIs with terephthaloyl diazide by solution polycondensation in DMSO using di-n-butyltin dilaurate at 75°C. Synthesized polymers were characterized by elemental analysis, solubility, inherent viscosity, IR, 1H and 13C NMR and X-ray diffraction studies. Thermal stability and phase transition behaviour were evaluated by TGA, DSC and hot-stage optical polarized microscopy (HOPM). From X-ray diffraction studies d spacings were calculated for poly(imide-ester)s and d spacings showed an odd–even effect with varying number of methylene spacers. Similarly Tm values obtained by DSC analysis, showed an odd–even effect. Thermal stability decreases as methylene chain length increases. © 1998 Society of Chemical Industry
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