Abstract
Spacings and intensities of Bragg reflections for mixtures of poly(γ-benzyl-L-glutamate) (PBLG) and poly(γ-benzyl-D-glutamate) (PBDG) were measured as a function of temperature from −70 to 110°C. Mixtures of L and D molecules were found to show a transition due to side-chain motion in the vicinity of 25°C and a first-order phase transition in the vicinity of 80°C. From the intensity of the 10.6-Å reflection which is caused by regular stacks of benzyl groups, the degree of stacking S was estimated at each temperature. The temperature dependence of S thus obtained was compared with that calculated on the basis of a theory proposed by Hoffman. The phase transition at 80°C can be interpreted in terms of the order—disorder transition, which is caused by the transition of benzyl groups from the stacked state to the unstacked state.
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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. II. Phase Transition of DL Mixtures of Poly(γ-benzyl glutamate)s. Polym J 7, 382–386 (1975). https://doi.org/10.1295/polymj.7.382
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DOI: https://doi.org/10.1295/polymj.7.382