Liquid crystal polymers. VIII. Liquid crystalline polyesters of trans-4,4′-stilbenedicarboxylic acid and 1,3-propanediol

0887-624X

Chemistry ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

In our recent overview of liquid crystalline polyesters of trans-4,4′-stilbenedicarboxylic acid (SDA) and aliphatic glycols,1 we reported that “… the 1,3-propanediol polyester did not exhibit thermotropic liquid crystallinity (no stir opalescence or DSC endotherm above Tm), perhaps because of the relatively high Tm (303°C) for a polymer of a glycol having an odd number of carbon atoms.” We now have studied the melting characteristics of another sample of this polymer more carefully and have concluded that it does exhibit a liquid crystalline mesophase over a very narrow temperature range. In this Note we give the thermal properties of this polymer and the thermal and mechanical properties of an SDA/1,3-propanediol copolyester which we also injection molded. These properties are compared and contrasted with those of the similar polyester and copolyester prepared with 1,4-butanediol instead of 1,3-propanediol.

1 Ill.

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