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- W1567000614 abstract "A DSC study is reported on the dependence of thermal properties on molecular weight in two series of thermotropic liquid-crystalline poly(ester-β-sulfide)s, 9S4 and 9S5. The molecular weights range from approximately 1 600 to 14 000. All of the polymers exhibit a nematic phase preceded, at lower temperature, by a smectic A phase which is monotropic in the majority of the cases. The nematic-isotropic transition temperatures and relevant entropy changes were found to be practically insensitive to molecular weight variations. In contrast, the smectic A-nematic transition temperatures and entropy changes increase with increasing molecular weight and reach a plateau value at an average chain length of 6–7 repeating units. It is suggested that in the nematic phase of these polymers the flexible segment plays a role of diluent of the rigid groups, whereas at the nematic-smectic A transition a cooperative increase in chain stiffness takes place." @default.
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- W1567000614 date "1990-01-01" @default.
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- W1567000614 doi "https://doi.org/10.1002/macp.1990.021910112" @default.
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