Temperature dependence of the mutual diffusion coefficient of deuterated polystyrene and poly(methyl methacrylate)

Abstract

Nuclear reaction analysis is used to study the mutual diffusion of low molecular weight deuterated polystyrene and poly(methyl methacrylate). The diffusion process is found to follow the ``slow'' theory predictions at low annealing temperatures and the ``fast'' theory predictions at higher temperatures. The change from one theory to the other occurs over a temperature range which depends on the polymer molecular weights. Within this range the mutual diffusion coefficient is described by the equations developed by Shearmur et al. [Macromolecules 29, 7269 (1996)].