Quantification of branching in polyethylene by 13C-NMR using paramagnetic relaxation agents

The role of paramagnetic relaxation agents Cr(acac) 3 and Fe(acac) 3 and the effect of 13C-NMR instrumental conditions have been studied in quantification of branching in polyethylene. The addition of relaxation agent, with spectrometer set for gated decoupling mode and a pulse delay of 8.5 sec, has...

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Bibliographic Details
Published in:European polymer journal 1991, Vol.27 (3), p.251-254
Main Authors: Prasad, J.V., Rao, P.V.C., Garg, V.N.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:The role of paramagnetic relaxation agents Cr(acac) 3 and Fe(acac) 3 and the effect of 13C-NMR instrumental conditions have been studied in quantification of branching in polyethylene. The addition of relaxation agent, with spectrometer set for gated decoupling mode and a pulse delay of 8.5 sec, has considerably shortened the experimentation time. Various grades of polyethylene have been analyzed for branching through computerized 13C-NMR under these conditions.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(91)90102-T