Abstract
The synthesis and thermal properties of new thermotropic liquid crystalline (LC) poly[γ-4-(4′-alkoxyphenyl)benzyl-L-glutamate]s (8) are described. γ-4-(4′-Alkoxyphenyl)benzyl-L-glutamates (6a—f)are prepared by the addition of 4-alkoxy-4′-hydroxymethylbiphenyl (3a—f) to N-phthaloyl-L-glutamic anhydride (4), followed by removal of the N-protecting group. 8a—f are synthesized by the polymerization of γ-4-(4′-alkoxyphenyl)benzyl-L-glutamate-N-carboxyanhydrides (7a—f), which are prepared by treatment of 6a—f with phosgene. Although 8a—c do not show transition peaks in DSC heating curves, 8d—f show two endothermic transition peaks. Viewing on the hot stage with a polarizing microscope suggests that the first transition is due to the transition from the crystalline state to the 1st LC state and the second one is attributed to the transition from the 1st LC state to the 2nd LC state. Therefore, the long alkyl segment with more than a certain carbon number as the side chain of 8 is essential for the appearance of thermotropic LC state.
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Hanabusa, K., Tanaka, O., Koyama, T. et al. Synthesis and Estimation of Poly[γ-(4-alkoxyphenyl)-benzyl-L-glutamate]s. Polym J 20, 861–868 (1988). https://doi.org/10.1295/polymj.20.861
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DOI: https://doi.org/10.1295/polymj.20.861
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