A new interesting series of linear, unsaturated copolyesters containing
cyclopentanone moiety in the main chain were synthesized by interfacial
polycondensation of a mixture containing one mole of both monomeric units 2,5-bis
(4-hydroxybenzylidene) cyclopentanone (Ia) and 2,5-bis (4-hydroxy-3-
methoxybenzylidene) cyclopentanone (Ib) together with two moles of different acid
chlorides. The yield and the values of reduced viscosity of the copolyesters were
found to be affected by the kind of organic phase, contribution of
benzyltriethylammonium chloride as a catalyst, the quantitative ratio of organic to
aqueous phase, concentration of hydrogen chloride acceptor and time of addition of
the acid chloride. The resulting copolyesters were characterized by elemental and
spectral analyses. Moreover, the various characteristics of the various types of
prepared copolymers including: solubility, viscosity, X-ray diffraction analysis, DSC
and TGA were determined and discussed. The electrical properties of the copolyesters
were tested and the morphology of selected examples of the copolyesters was
examined by scanning electron microscopy.