Abstract
We prepared the main-chain type of TP- n polyesters, which are based on the terphenyl dicarboxylic acid and alkane diols with the carbon number of n = 5–20. All the TP- n polyesters form a smectic liquid crystal, exhibiting the well known odd–even oscillation with respect to the thermodynamic parameters of transitions and smectic structure. From the x-ray patterns of the oriented fibres, the SA and SCA structures were identified for the even and odd series of TP- n respectively. The structural characteristics of the polymeric SA and SCA phases are presented by examining the variation of layer spacing with n in a wide range of n = 5 to 20.
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