Abstract
The effect of high pressure on the main chain motion near the glass transition temperature ( T g) in amorphous chain-deuterated polystyrene is studied using deuteron n.m.r. spin alignment echo and quadrupole echo spectra. Comparison with simulated spectra yields information on the time-scale and the type of motion. In the vicinity of T g the main chain performs ultra-slow small angle diffusive motion. The temperature dependence of the mean correlation time shows a strongly non-Arrhenius behaviour, typical for the so-called α-process. The width of the correlation time distribution rapidly increases on approaching T g. The effect of pressure on the motion is found to be much weaker than could be expected from equation-of-state data.
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