X-Ray Scattering of Synthetic Poly(α-amino acid)s in the Solid State. V. An Analysis of Poly(γ-methyl L-glutamate) and Poly(γ-benzyl L-glutamate) by a Coaxial Two Phase Model of Diffraction Intensity

Abstract

A coaxial two phase model is presented to account for the change with temperature in the intensity of the (100) reflection for the poly(γ-methyl L-glutamate) crystal and that of the (110) reflection for the poly(γ-benzyl L-glutamate) crystal. This model consists of two coaxial rods, whose central part represents a rigid helical backbone and the surrounding part, soft side chains. The equation for the temperature dependence of the (hk0) reflection intensity from the crystal in which the coaxial rods are hexagonally packed, is derived, and applied successfully to analyze the experimental results.