AROMATIC COPOLYESTERS WITH STILBENE MESOGENIC GROUPS .2. SYNTHESIS AND THERMAL-BEHAVIOR

A number of wholly aromatic copolyesters were prepared from methylhydr oquinone diacetate, stilbenedicarboxylic acid, and at least one of the following diacids: isophthalic acid, terephthalic acid, and 4,4'-oxyd ibenzoic acid. The copolyesters were characterized by DSC, optical mic roscopy, and X-ray diffraction. The effects of composition on the ther mal and structural characteristics of the materials were evaluated. An nealing after-treatments were also carried out. The results of differe nt thermal treatments showed that copolyesters were substantially affe cted by thermal treatments in terms of both transition temperatures an d structures.