Wide-Angle X-Ray Scattering of Poly(tetroxocane) Obtained by Radiation-Induced Polymerization in the Solid State

Abstract

ABSTRACT:X-Ray scattering profiles of 009 and 0018 reflections of poly(tetroxocane) prepared by radiation-induced polymerization were investigated. It was confirmed that two types of crystallites coexisted in the polymers obtained by post-polymerization above 80°C: lamellar type crystallites with a longitudinal dimension of I 00 A and fibrillar crystals 250 A in crystallite size. The lamellar crystallites were less distorted than the fibrillar ones. Only fibrillar crystallites were found in samples polymerized below 80oC.KEY WORDS Poly(tetroxocane) I Wide-Angle X-Ray Scattering 1 Crystallite Size I Distortion Parameter I Lamellar Fibrils I Melting Behavior I In a preceding paper/ the fibrillar structure of a poly(tetroxocane) (PTEOX) sample prepared by the radiation-induced post-polymerization of tetroxocane above 80°C was investigated by small-angle X-ray scattering (SAXS) and thermal analysis. A broad discrete reflection corresponding to a Bragg spacing of about 500 A was observed on the meridian in addition to the reflection associated with a long spacing of 100 A. It was ascertained that the former reflection was due to the density difference between void and fibrillar crystals stacked alternately in the direction of the c-axis, while the latter was due to the lamellar crystals probably situated between the fibrillar ones. 2 In this paper, wide-angle X-ray scattering (W AXS) of PT EOX is investigated in order to clarify the lamellar and fibrillar structures of PT EOX polymerized at various temperatures.