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A study by 15N-NMR of end-groups formed from azobisisobutyronitrile

✍ Scribed by J.C Bevington; T.N Huckerby

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 255 KB
Volume: 31
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(94)00117-0

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✦ Synopsis

Azobisisobutyronitrile, enriched with lsN in its nitrile groups, was used to initiate polymerizations at WC of styrene, methyl methacrylate and vinyl acetate and also copolymerizations of styrene with methyl methacrylate. The resulting polymers were examined by high-field 15N-NMR spectroscopy. The chemical shift for the enriched site in a Me,C(CN)-end-group depended upon the nature of the attached monomeric unit and, for the copolymers, was affected by the chemical nature of more remote units. There was only limited evidence for effects of the stereochemistry of monomeric units near the end-groups.

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