DEUTERON NMR IN RELATION TO THE GLASS-TRANSITION IN POLYMERS

**2H NMR is introduced as a tool for investigating slow molecular motion in the glass transition region of amorphous polymers. In particular, **2H spin alignment echo spectra of chain deuterated polystyrene were compared with models for restricted rotational Brownian motion. Molecular motion in the polystyrene-toluene system has been investigated by analyzing **2H NMR of partially deuterated polystyrene and toluene, respectively. The diluent mobility in the mixed glass has been decomposed into 'solid' and 'liquid' components where the respective average correlation times differ by more than 5 decades.