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Compositional sequence distribution and second-order Markov statistics in vinyl chloride-vinylidene chloride copolymers by Carbon-13 NMR

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Summary

90 MHz-1H-NMR and 22.635 MHz-13C-NMR spectroscopy were used in a study of vinyl chloride-vinylidene chloride co-polymers. Triad sequence distribution of CCl2 and CHCl carbon was generated for these copolymers and compared to calculated distributions based on Bernoullian, first-order Markov and second-order Markov statistics. It was observed that for samples different in the conditions of preparation including commercial materials in each case different Markov models give the best fit in formally mathematical treatment without kinetic significance but with the aim of interpretation of physical and/or chemical properties of the copolymers. The 52–56 ppm region of the VC-VDC copolymer spectra is complicated by the superposition of the effects of tacticity, sequence distribution and the presence of both CH and CH2 carbons.

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Authors and Affiliations

  1. Department of Physics, Technical University “Carl Schorlemmer” Leuna-Merseburg, DDR-4200, Merseburg, German Democratic Republic

    K. Schlothauer & H. Schneider

  2. Anatomical Institute, Laboratory for Histophysics, Karl-Marx-University Leipzig, DDR-7010, Leipzig, German Democratic Republic

    F. Keller

  3. Institute of Polymers, Technical University, Lodź, Poland

    B. Wandelt

Authors
  1. K. Schlothauer
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  2. F. Keller
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  3. H. Schneider
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  4. B. Wandelt
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Schlothauer, K., Keller, F., Schneider, H. et al. Compositional sequence distribution and second-order Markov statistics in vinyl chloride-vinylidene chloride copolymers by Carbon-13 NMR. Polymer Bulletin 13, 473–479 (1985). https://doi.org/10.1007/BF01033348

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  • DOI: https://doi.org/10.1007/BF01033348

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