A series of four linear-unsaturated copolyesters IX-XII in 73% to 88% yield were
synthesised by interfacial polycondensation technique of 1,3-bis(4-hydroxy-3-
methoxybenzylidene)-4-phenylcyclohexanone I or 1,3-bis(4-hydroxybenzylidene)-4-
phenylcyclohexanone II with 3,3`-isophthalate dibenzoyl chloride V or 4,4`-
terephthalate dibenzoyl chloride VI. Initially, the monomers I, II, V and VI were
synthesised in excellent yields by following a literature procedure [1-4]. In addition,
the model compounds VII, VIII were also synthesised by reacting I or II with ben-
zoyl chloride in 76% and 89% yield respectively [1]. The chemical structure of the
monomers, model compounds and copolyesters have been confirmed by elemental
and spectral analysis as stated in. Finally, studying the solubility of the copolyesters
showed that most of them were insoluble in most common organic solvents.