Abstract
Dynamic mechanical measurements on a series of poly(γ-alkyl L-glutamate)s in the solid state were carried out over a frequency range from 0.005 to 1.0 Hz at various temperatures covering the side-chain dispersion region in order to examine the effects of the side-chain length. Frequency dispersion curves of real and imaginary parts of complex shear modulus and loss tangent at various temperatures could be superposed on a set of master curves by performing a horizontal shift along the logarithmic frequency axis and the additional vertical shift along the logarithmic modulus axis, if necessary, for three polymers of poly(γ-octyl L-glutamate), poly(γ-heptyl L-glutamate), and poly(γ-hexyl L-glutamate). A unique set of horizontal and vertical shift factors could not be found for poly(γ-butyl L-glutamate), poly(γ-amyl L-glutamate), and poly(γ-ethyl L-glutamate). The temperature dependence of the horizontal shift factor is represented by the WLF equation with the conventional parameters. The distribution of the relaxation times was found to become sharper with an increase in the side-chain length. These results are discussed in terms of a two-phase model consisting of the rigid α-helical backbone embedded in the flexible side-chain region.
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Yamashita, Y., Hikichi, K. & Kaneko, M. Dynamic Mechanical Properties of Poly(α-amino acid)s. III. Poly(γ-alkyl L-glutamate)s. Polym J 12, 439–445 (1980). https://doi.org/10.1295/polymj.12.439
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DOI: https://doi.org/10.1295/polymj.12.439
