Abstract
The structure and the dynamic mechanical properties of solid films of poly(L-glutamic acid) (PGA), which were cast from N,N-dimethylformamide (DMF) and dioxane (D)–water (W) mixtures (1:2, 1:1, 2:1, 3:1, 4:1, and 6:1 by volume) at 60°C, were investigated. Three different types of PGA films were obtained: (1) films cast from D–W (1:2) and D–W (1:1) had a high crystallinity, (2) films cast from D–W (2:1), D–W (3:1), and D–W (4:1) had pale cholesteric colors, and (3) films cast from D–W (6:1) and DMF had a lower crystallinity. From dynamic mechanical measurements, at least five relaxational modes were recognized between room temperature and 210°C. The α-relaxation observed at 200—210°C (3.5 Hz) was assigned to the thermal degradation. The β-relaxation observed at 140—160°C (3.5 Hz) may be a crystalline relaxation such as a molecular motion of α-helices of PGA in the crystalline region or a mutual displacement of neighboring crystallites. The γ-relaxation observed at 115—130°C (3.5 Hz) was assinged to the micro-Brownian motions of α-helices in the disordered region. The δ-relaxation observed at 60—95°C (3.5 Hz) may be associated with the side chain motions caused by the rupture of hydrogen bonds between carboxyl groups. The ε-relaxation observed at 20—45°C (3.5 Hz) was assigned to the side chain motions in the disordered region.
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Mori, T., Morofuji, A. & Tanaka, R. Aggregation State of Molecular Chains and Dynamic Mechanical Behavior of Poly(L-glutamic acid). Polym J 11, 721–729 (1979). https://doi.org/10.1295/polymj.11.721
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DOI: https://doi.org/10.1295/polymj.11.721