THERMOTROPIC POLYESTER - THE INFLUENCE OF THE SPACER ON THE PHYSICAL-PROPERTIES

Thermotropic polyesters prepared from series of 4,4'-dihydroxy-alpha,w -diphenoxy alkanes and 4,4'-dichloroformyl-alpha,w-diphenoxy alkanes a re well known. The substitution of a methylenic spacer by an oxyethyle nic spacer in the main chain of these polyesters drastically modifies their physical properties, particularly the mesogenic transition tempe ratures, as can be observed by DSC and thermooptical analysis. The the rmal stability and the polymer solubility in common organic solvents o f these polymers did not show a significant change. The physical prope rties of the two thermotropic polyesters prepared in diphenyl ether we re evaluated.