| Non-Gaussian behavior of crystalline and amorphous phases of polyethylene (2000) | |||||||||||
Abstract | |||||||||||
| Non Gaussian behavior crystalline and amorphous phases polyethylene Kanaya Institute for Chemical Research Kyoto University Uji Kyoto Japan Buchenau and Koizumi Institut Festko rperforschung Forschungszentrum lich Germany Tsukushi and Kaji Institute for Chemical Research Kyoto University Uji Kyoto Japan Received June report measurements the incoherent elastic neutron scattering intensity Iel polyethylenes with degrees crystallinity and wide length scattering vector range from to observe the deviation from the Gaussian behavior The non Gaussian behavior was observed both the amorphous and the crystalline phases The non Gaussian behavior the theoretically well known crystalline phase can understood more less quantitatively terms the anisotropy the mean square displace ment The result implies that least part the non Gaussian behavior the amorphous phase due the same source while another part may due the dynamical heterogeneity inherent the amorphous phase the incoherent elastic scattering from solids one often nds deviations from the Gaussian behavior and are exponents the Debye Waller fac tor and mean square displacement the atoms the direc tion the momentum transfer These deviations are noted non Gaussian behavior amorphous solids where the low frequency excitations are only poorly understood one has evidence for localized low frequency modes from numerical work seems natural attribute the non Gaussianity these localized modes the spirit the soft potential model which postulat | |||||||||||
Publication details | |||||||||||
| |||||||||||