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Compositional sequence determination of acrylonitrile-butyl acrylate copolymers by13C n.m.r. spectroscopy

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
34
Issue
16
Identifiers
DOI: 10.1016/0032-3861(93)90466-n
Keywords
  • Copolymers
  • Monomer Structure
  • Spectroscopy

Abstract

Abstract Acrylonitrile-butyl acrylate (A/B) copolymers of different monomer compositions were prepared by bulk polymerization using a free radical initiator. Copolymer compositions were determined by elemental analyses and comonomer reactivity ratios were determined using a non-linear least squares errors-in-variables model. Terminal and penultimate reactivity ratios were calculated using the observed monomer triad sequence distribution determined from 13C{H} n.m.r. spectra. The triad sequence distribution was used to calculate diad concentrations, conditional probability parameters, number-average sequence lengths and block character of the copolymers. The observed triad sequence concentrations determined from 13C{ 1H} n.m.r. spectra agreed well with those calculated from reactivity ratios.

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