Abstract
The crystallization behavior of semi-flexible liquid crystalline polyesters and their blends has been investigated by differential scanning calorimetry and optical microscopy. The Avrami exponent of the nematic polyester having hexamethylene spacer (NP6) is about 2 which suggests rod-like growth from sporadic nuclei, and the solid structure of the polymer is very similar to that of the melt state. However, the nematic and smectic polyesters having decamethylene spacer (NP10, SP10) show gross recognization of the structure during crystallization. The length of the methylene flexible spacer has a significant effect on the crystallization behavior of liquid crystalline polymers. In blends of nematic and smectic polymers, the crystallization rate of the smectic component (SP10) is accelerated by the addition of small amounts of nematic polymers (NP6, NP10) which may act as heterogeneous nuclei, while that of the nematic component is slowed as the concentration of the smectic component increases.
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Yoo, Y., Kim, S. Crystallization Behavior of Semi-Flexible Liquid Crystalline Polyesters and Their Blends. Polym J 20, 1117–1124 (1988). https://doi.org/10.1295/polymj.20.1117
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DOI: https://doi.org/10.1295/polymj.20.1117
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