INTERDIFFUSION OF DEUTERATED AND PROTONATED POLY(METHYL METHACRYLATE)

Nuclear Reaction Analysis is used to study the interdiffusion of deute rated and protonated poly(methyl methacrylate). The diffusion process is found to follow the fast theory predictions and self diffusion is s een to be governed by pure reptation with no evidence of constraint re lease. The diffusion coefficients scale with temperature according to the Williams-Landel-Ferry equation and are in good agreement with valu es calculated from viscoelastic parameters using the reptation theory; they are however, about fifty times smaller than other recently publi shed values for similar molecular weights. (C) 1998 Elsevier Science L td. All rights reserved.