Abstract
Precipitates of poly(γ-benzyl glutamate) (PBG) were prepared from dimethylformamide—propionic acid solutions under various conditions. Electron micrographic observations and X-ray diffraction analyses of the precipitates thus obtained were carried out. The electron micrographs of the precipitates exhibited patterns similar to those reported by Ishikawa and Kurita, and Tachibana and Kambara (super helices), though lamella-like patterns (platelets) were observed under certain conditions. The viscoelastic properties, thermal analyses, and specific volume vs. temperature curves of the precipitates were investigated. As for the viscoelastic properties, the precipitates showed peaks of tanδ at 50°C and 120°C (110 Hz). The moduli E′ decreased remarkably near 120°C. In the thermal analyses an endothermic peak appeared in the vicinity of 130°C and a transition appeared at 132°C in the specific volume vs. temperature curve. The phenomena observed in the vicinity of 130°C were considered to be related to a breakdown of stacks of the benzene rings of PBG in the precipitates, from comparison with the properties of cast films reported previously. The electron micrographs of the precipitates from various helicogenic solvent—precipitant mixtures were the same as those of the precipitates from dimethylformamide—propionic acid solution.
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Aritake, T., Tsujita, Y. & Uematsu, I. Structure and Properties of Precipitates of Poly(γ-benzyl glutamate). Polym J 7, 21–25 (1975). https://doi.org/10.1295/polymj.7.21
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DOI: https://doi.org/10.1295/polymj.7.21