Abstract
Lateral spacings between helices and corresponding X-ray diffraction intensities for poly(γ-benzyl L-glutamate) and poly(γ-methyl L-glutamate) in the solid state have been measured as a function of temperature from −100 to 100°C. The integrated intensity increased with increasing temperature and moreover showed breaks in the vicinity of room temperature, where breaks were also observed in the spacing—temperature relation. The temperature dependence of the intensity is approximately interpreted in terms of the same concept encountered in the small-angle X-ray scattering for crystalline polymers. The breaks observed are considered to be a transition analogous to the glass transition which occurs in a paracrystalline region and is related to side-chain motion. The results seem to suggest that the side chain does not assume any definite structure above the transition temperature.
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Matsushima, N., Hikichi, K., Tsutsumi, A. et al. X-Ray Scattering of Synthetic Poly(α-amino acid)s in the Solid State. I. Transition of Poly(γ-benzyl L-glutamate) and Poly(γ-methyl L-glutamate). Polym J 7, 44–49 (1975). https://doi.org/10.1295/polymj.7.44
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DOI: https://doi.org/10.1295/polymj.7.44
