Spatially resolved nuclear magnetic resonance study of polymer chains mobility during the swelling process

Abstract

A recent method to perform spatially resolved nuclear magnetic resonance(NMR) and relaxation measurements in narrow slices of a solid is applied to the study of the mobility changes of polymer chains during the swelling process. Spin density and T 1 profiles are obtained during the swelling of polymethylmethacrylate and polystyrene bars exposed to vapors of deuterated chloroform and carbontetracloride. The diffusion coefficients and their concentration dependences have been determined and the nondestructive character of NMR for liquid–solid interface studies is established.