Abstract
In order to get detailed information about the β-relaxation due to motion of side chains in poly(γ-methyl L-glutamate) poly(γ-ethyl L-glutamate) and poly(γ-n-propyl L-glutamate), the frequency and temperature dependences of loss permittivity were determined in the frequency range from 10−4 Hz to 105 Hz and at temperatures ranging from ca. −100°C to ca. 60°C. The shape of the loss permittivity as a function of frequency was independent of the side-chain length. The loci of loss-permittivity peaks on the relaxation map could be represented by two straight lines independent of the side-chain length. They intersect in the glass transition region associated with the α-relaxation due to the motion of the main chain. The activation energy below the glass transition region was thought to be essentially due to side-chain motion and estimated to be ca. 18 kcal mol−1. The value of the activation energy and shape of the loss permittivity curve are very similar to those of the β-relaxation in poly(n-alkyl methacrylate)s. The two-site model analysis of the relaxation strength also showed similarity. On the basis of these results, the molecular mechanism of the α-relaxation and the nature of the glass transition are explained in terms of the motion of the α-helix.
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Kakizaki, M., Nakayama, H. & Hideshima, T. Dielectric Relaxations in Poly(γ-n-alkyl L-glutamate) II. Study of Relaxation due to Motion of the Side Chain and that due to Motion of the Main Chain. Polym J 18, 141–151 (1986). https://doi.org/10.1295/polymj.18.141
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DOI: https://doi.org/10.1295/polymj.18.141