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Kinetics of the phase transition in liquid crystalline poly(alkyl terephthaloyl bis-(4-oxybenzoate))s

✍ Scribed by J. Lorente; C. Marco; M.A. Gómez; J.G. Fatou

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 794 KB
Volume: 28
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(92)90319-w

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✦ Synopsis

The kinetics of formation of three dimensional order from the mesophase have been studied for poly(alkyl terephthaloyl bis-(4-oxybenzoate))s with hexa-, hepta-and decamethylene spacers, using differential scanning calorimetry. The rate of transformation and the crystallinity level attained have been related to the length of the spacer and efficiency of packing. An Avrami exponent of four has been obtained for the three polymers and the values for AHm0 have been reported for the first time. Finally, from the temperature coefficient of the process, the interfacial free energies have been obtained and related to chain flexibilities.

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## Abstract Raman spectra of terephthalidine‐bis‐heptylaniline (TB7A) were recorded in the region 1125–1225 cm^−1^ from room temperature to 10 K at 18 different temperatures. The splitting of the ∼1165 cm^−1^ band, and the variation of the ratio of integrated intensities of the original band at ∼11