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Dielectric Properties of Poly(γ-methyl D-glutamate) and Copoly(γ-methyl D,L-glutamate) Films

1977; Springer Nature; Volume: 9; Issue: 2 Linguagem: Inglês

10.1295/polymj.9.195

1349-0540

Junji Watanabe, Ichitaro Uematsu,

Conducting polymers and applications

Dielectric measurements of poly(γ-methyl D-glutamate) (PMDG) and copoly(γ-methyl D,L-glutamate) (PMDLG) films were performed over the frequency range from 30 Hz to 1 MHz and over the temperature range from −50°C to 70°C. A dispersion peak arising from the molecular motion of side chains was found and discussed. For the PMDG films cast from chloroform, 1,2-dichloroethane (EDC), and dichloromethane (DCM) solutions, differences in the side chain mobility were interpreted in relation to the molecular packing of α-helices. The Cole—Cole plots showed that the relaxation strength of the PMDG film cast from chloroform solution is smaller than that of the other films. This fact was interpreted in terms of the side-chain structure, which presumably restricts the side-chain motion. The PMDG and PMDLG films cast from trifluoroacetic acid (TFA)—EDC solutions showed two dispersions, which were attributed to the side-chain motions in two different phases.