13C NMR Characterization of the Branched Structure of Ethylene-Vinyl Chloride Copolymer.

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  • ｀１３´Ｃ　ＮＭＲによるエチレン／塩化ビニル共重合体中の分枝構造の解析
  • 13C NMR ニヨル エチレン エンカビニル キョウジュウゴウタイチュウ ノ

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Abstract

The short-chain branched structure of ethylene-vinyl chloride copolymer obtained from suspension copolymerization was studied by using 13C NMR spectroscopy. The 13C NMR chemical shifts of short chain branched structures in the ethylene-vinyl chloride copolymer were calculated from substituent increments of a chemical shift. 13C NMR spectra showed the C4 branch having the ethylene residue as a branch end group in the copolymer. The C4 branch having the ethylene residue in the branch end was presumed to be the characteristic structure in ethylene-vinyl chloride copolymer.<BR>On the other hand, the ethylene residue was not observed in the C2 branch. The C2 and C4 branch structures were detected by the 13C NMR spectra of the copolymer after dechlorination with tri-n-butyltin hydride at the part of vinyl chloride units. The C2 branch in ethylene-vinyl chloride copolymer was thought to be formed only from vinyl chloride propagation. The C4 branch having the ethylene residue in the branch end group could not induce the second back-biting reaction associated with the C2 branch formation.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 54 (9), 566-570, 1997

    The Society of Polymer Science, Japan

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