Abstract
To investigate the effect of a branched methyl group in a lateral long-chain substituent on liquid crystalline properties, two polyesters containing a decamethylene spacer and a triad mesogen with 2-methyl-1-butoxy and n-butoxy substituents, I and II, respectively, were prepared and characterized by wide angle X-ray diffraction (WAXD), thermal and optical methods. Both polymers exhibited the exactly similar crystalline state and melt transition. In contrast, the isotropization transition of I was observed at lower temperature than II. The data obtained suggest that the branched methyl group in the butoxy substituent did not influence the formation of the crystal and the melting transition, but it depressed only the isotropization transition.
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Fujishiro, K., Lenz, R. Effect of Branched Methyl Group in Lateral Substituent on Main Chan Liquid Crystalline Polyesters. Polym J 24, 1337–1343 (1992). https://doi.org/10.1295/polymj.24.1337
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DOI: https://doi.org/10.1295/polymj.24.1337