Dynamics of the α-process of polymer systems on a microscopical timescale. Neutron and nuclear magnetic resonance study

Abstract

The dynamics of the α-process in poly(vinyl methyl ether) (PVME) on a microscopical timescale have been studied by means of nuclear magnetic resonance and incoherent quasi-elastic neutron scattering techniques. The experimental data have been interpreted in terms of a spectral density function, J( ω), and a scattering law, S( Q, ω), which were built startingl from the Havriliak-Negami relaxation function. The results obtained have been compared with the dielectric and mechanical relaxation behaviour of the α-process. It appears that the dynamics of the α-process of PVME on a wide time range (1 to 10 −10 s) can be described by using the same time-temperature behaviour and the same Havriliak-Negami ‘shape-parameters’.