POLYANHYDRIDES .10. ALIPHATIC POLYESTERS AND POLY(ESTER-ANHYDRIDE)S BY POLYCONDENSATION OF SILYLATED ALIPHATIC DIOLS

A new class of biodegradable copolyesters was prepared by polycondensa tion of sebacoyl chloride with mixtures of silylated isosorbide and si lylated O,O'-bis(2-hydroxyethyl)hydroquinone in bulk. A class of poly( ester-anhydride)s was synthesized from sebacoyl chloride and mixtures of silylated O,O'-bis(2-hydroxyethyl)hydroquinone and silylated 4-hydr oxybenzoic acid. A second class of poly(ester-anhydride)s was obtained by polycondensation of sebacoyl chloride with mixtures of silylated i sosorbide and silylated il-hydroxybenzoic acid. The molar ratio of anh ydride and ester groups was varied via the proportion of 4-hydroxybenz oic acid in the feed. All polyesters were characterized by inherent vi scosities, elemental analyses, H-1 NMR and IR spectra, WAXS and DSC me asurements. All polyesters proved to be semicrystalline materials.