Investigation of the intramolecular structure of styrene-ethylmethacrylate copolymers by 1H- and 13C-NMR : reassignment of H-NMR spectra

J.C.J.F. Tacx, G.P.M. Velden, van der, A.L. German

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Abstract

The compositions and sequence distributions of homogeneous styrene (S)–ethyl methacrylate (E) copolymers, obtained by low conversion solution polymerization have been studied by 1H- and 13C-NMR. A new set of peak triad assignments was proposed for the d 2.1–4.2 ppm region in the 1H-NMR spectrum, whereby the reactivity ratios of rS = 0.59 and rE = 0.50 were used to establish this new assignment. The EEE and SSS blocks, present in these copolymers, have a high degree of syndiotacticity (sEE = 0.23, sSS = 0.39), whereas the ESE units are exhibiting a slight tendency toward isotacticity (sES = 0.66).
Original languageEnglish
Pages (from-to)1439-1456
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume26
Issue number5
DOIs
Publication statusPublished - 1988

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