Abstract
AbstractThe proton spin‐lattice relaxation time T1 was determined at 13,8, 55,2, and 90 MHz in polystyrene (PS‐d0) and polystyrene deuterated at the chain (PS‐d3) and the phenyl groups (PS‐d5), respectively, at temperatures between −130 and +230°C. Furthermore, T1 was measured in isotopic mixtures of PS‐d3 and fully deuterated PS‐d8 where a separation into intramolecular and intermolecular contributions was possible through the deuteron dilution technique. Above 130°C, various distributions of correlation times provide a semiquantitative understanding of the different motins seen by the protons of the partially deuterated systems. Rotating frame relaxation times in PS‐d3 and PS‐d5 reveal librational motions in the solid glass (below 100°) where the amplitudes of the phenyl group librations are much larger than those of the chain oscillations, but the correlation times are of the same order of magnitude.
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