Abstract
Poly(γ-benzyl L-glutamate) (PBLG) whose molecule is a straight rod in shape and a large permanent dipole moment along the rod axis and once-broken (OB)-PBLG which has two anti-parallel permanent dipoles in its molecule composed of two α-helices jointed by a flexible chain of the bifunctional initiator (trimethylenediamine) in the manner of head to head, were synthesized and the behavior of concentrated solutions were investigated. The solution of OB-PBLG formed a cholesteric liquid crystal as well as that of straight (S)-PBLG. Temperature and concentration dependency of cholesteric texture for both polymers were similar, except for OB-PBLG having a lower molecular weight, Mv<5×104. Alignment of molecules in a thin cell is different for the two polymers. As dynamics of the electro-optic response, differences for the two polymers are clearly evidently. Response time of OB-PBLG is 60 to 70 times as long as that of ordinary S-PBLG, under similar experimental conditions.
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Imai, T., Uematsu, Y., Hiraoka, K. et al. Physical Properties of Liquid Crystalline Solution of Once-Broken Rod Poly(γ-benzyl L-glutamate). Polym J 33, 560–567 (2001). https://doi.org/10.1295/polymj.33.560
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DOI: https://doi.org/10.1295/polymj.33.560