Abstract
Dynamic viscoelastic properties of a newly synthesized thermotropic liquid crystalline homo-polymer with relatively low transition temperatures were measured over a range of temperatures with a Rheometrics Mechanical Spectrometer (RMS). The unique behavior of this material, highlighted by an intermediate temperature minimum in the |η*| vs. T curve in the temperature range explored, is indicative of a liquid crystal nature, and may be related to structural differences. Viscoelastic results were therefore compared with optical micrographs taken in the static state over the range of temperatures. Polarized light optical microscopy identifies the so-called isotropitization temperature which signals the beginning of the isotropic rheological behaviour, but optical micrographs show little apparent corresponding structure change below this temperature, in the range where the intermediate temperature rheological transition is located.
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Driscoll, P., Fujiwara, Ki., Masuda, T. et al. The Effect of Temperature on Optical and Viscoelastic Properties of a Homogeneous Thermotropic Liquid Crystalline Polymer. Polym J 20, 351–356 (1988). https://doi.org/10.1295/polymj.20.351
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DOI: https://doi.org/10.1295/polymj.20.351