Abstract
AbstractIn 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.
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