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Determination of the configuration of citraconic anhydride units in copolymers ofp-methoxystyrene with citraconic anhydride via13C NMR spectroscopy

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Summary

The configuration of citraconic anhydride units in p-methoxystyrene/citraconic anhydride copolymers prepared in methyl ethyl ketone at 50.0±0.1°C and the corresponding copolymer compositions and comonomer unit sequence distributions were determined over a range of comonomer feed mole fractions using13C NMR spectroscopy. It was found that the ratio ofZ (zusammen) toE (entgegen) configurations of citraconic anhydride units in these copolymers increased with the degree of alternation of the comonomer units, reaching a constant value of approximately 1.72 when the comonomer units were almost completely alternating and the mole fraction of citraconic anhydride units in the copolymers approached 0.50.

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Authors and Affiliations

  1. Department of Chemistry, University of New England, 2351, Armidale, N.S.W., Australia

    Paul G. Brown & Kiyohisa Fujimori

Authors
  1. Paul G. Brown
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  2. Kiyohisa Fujimori
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Brown, P.G., Fujimori, K. Determination of the configuration of citraconic anhydride units in copolymers ofp-methoxystyrene with citraconic anhydride via13C NMR spectroscopy. Polymer Bulletin 29, 213–217 (1992). https://doi.org/10.1007/BF00558059

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  • DOI: https://doi.org/10.1007/BF00558059

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