2H NMR study of aromatic guest dynamics in clathrate phases of syndiotactic polystyrene

H-2 NMR solid-state spectra of aromatic molecules (benzene, toluene, chlorobenzene, naphthalene) included in clathrate phases of syndiotactic polystyrene (s-PS) or absorbed in the amorphous phase of s-PS, have been recorded and analyzed for a broad range of temperature (230-360 K). The dynamic processes accessible to aromatic molecules absorbed in s-PS clathrate phases are essentially temperature independent for the whole temperature range under investigation. Moreover, the molecular re-orientations reflected in the NMR line-shapes are similar to those accessible to the same molecules when absorbed in polystyrene amorphous phase at temperatures substantially lower than the polymer glass transition temperature. A simulation procedure for 2 H NMR line-shape analysis has been used to establish models for the dynamic processes of the different aromatic guest molecules.