Effect of molecular oxygen on the n.m.r. relaxation times of some aromatic polymers

Proton spin-lattice ( T 1) and spin-spin ( T 2) relaxation times are reported for poly(2-vinylpyridine), poly(1-vinylanthracene) and polycarbonate in air, oxygen and in vacuo. The results substantiate earlier findings that oxygen complexes with the aromatic rings giving rise to T 1 minima which are...

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Bibliographic Details
Published in:Polymer (Guilford) 1976-01, Vol.17 (9), p.758-760
Main Authors: Froix, Michael F., Goedde, Andreas O.
Format: Article
Language:English
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Summary:Proton spin-lattice ( T 1) and spin-spin ( T 2) relaxation times are reported for poly(2-vinylpyridine), poly(1-vinylanthracene) and polycarbonate in air, oxygen and in vacuo. The results substantiate earlier findings that oxygen complexes with the aromatic rings giving rise to T 1 minima which are not intrinsic to the polymers. This effect appears to be fairly general for aromatic containing polymers. For those polymers containing low temperature relaxations intrinsic to the polymer, the oxygen paramagnetic effect can complicate the relaxation behaviour and, in some cases, totally mask the intrinsic processes. The transitions in T 1 and T 2, due to the torsional oscillation of the anthracene side group in poly(1-vinylanthracene), is much better defined than the corresponding transitions for previously reported aromatic vinyl polymers. The activation energy for the motion of the side group is comparable to that of polystyrene and poly( N-vinylcarbazole).
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(76)90029-X