6533b85cfe1ef96bd12bd262
RESEARCH PRODUCT
false
Hans SillescuE. RösslerP. Lindnersubject
chemistry.chemical_compoundchemistryProtonDeuteriumIntramolecular forceRelaxation (NMR)Intermolecular forceAnalytical chemistryPhenyl groupPolystyreneOrder of magnitudedescription
The 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1981-12-01 | Die Makromolekulare Chemie |