Abstract
A series of poly(γ-methyl D-glutamate) (PMDG) films with the different structures were systematically prepared from dichloromethane (DCM)—N, N-dimethyl-formamide (DMF) solutions. The structures of these films were classified into three types, vix., phase I, phase M, and phase C as obtained in a previous work from DMF, 1, 2-dichloro-ethane and DCM, respectively. Observation of the PMDG films cast from chloroform—DMF solutions, showed that phase C arises from the phase which consists of the cholesteric liquid crystal structure, and it was assumed that the crystallites in phase C should be divided into mosaic blocks. Three mechanical dispersions were observed at 160, 190°C, and above 200°C. The α1 dispersion (at 160°C) was associated with the molecular relaxation in phase I, and further, the α3 dispersion (above 200°C) was related to the molecular motion of α-helices in phase M with the cholesteric twisted structure. For the α2 dispersion (at 190°C) commonly observed for phase C, two relaxation mechanisms are discussed: the molecular motion of α-helices in phase C and the mutual displacement of the neighboring crystallites. The PMDG films cast from m-cresol at various temperatures and the PMDG—poly(γ-methyl L-glutamate) (PMLG) blend films cast from chloroform solutions, showed α remarkable shift of α2 loss peak temperature. To explain this shift in peak temperature, the latter mechanism seems reasonable for the α2 dispersion.
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Watanabe, J., Naka, M., Watanabe, J. et al. Structure and Mechanical Properties of Poly(γ-methyl glutamate) Films. II.. Polym J 10, 569–582 (1978). https://doi.org/10.1295/polymj.10.569
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DOI: https://doi.org/10.1295/polymj.10.569