6533b858fe1ef96bd12b6205
RESEARCH PRODUCT
false
Bernd WillenbergHans Sillescusubject
Crystallographychemistry.chemical_compoundNuclear magnetic resonanceDeuteriumChemistryIntramolecular forcePolymer chemistryRelaxation (NMR)Intermolecular forceProton NMRSpin–lattice relaxationPhenyl groupTwo-dimensional nuclear magnetic resonance spectroscopydescription
Solutions of chain- (PS-d3) and phenyl ring (PS-d5) deuterated polystyrenes in perdeuterated PS-d8 have been investigated with 1H and 2D NMR relaxation and wide line methods. The intra- and intermolecular parts of the 1H second moments at −100°C are 3,7 G2 and 2,0 G2, respectively, for PS-d3, and 14,7 G2 and ca. 0 G2, respectively, for PS-d5. The intermolecular contribution to the 1H spin lattice relaxation rate, determined at 55 MHz between 150°C and 250°C, is about one third of the total rate in PS-d3, and negligible in PS-d5. We suggest that this contribution is caused by rotational fluctuations of the intermolecular H H vectors. The intramolecular 1H- and 2D-relaxation rates indicate that the phenyl group motion is somewhat faster than the rotational segmental motion of the polymer chain.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1977-08-01 | Die Makromolekulare Chemie |