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

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 δ 2.1–4.2 ppm region in the 1H‐NMR spectrum, whe...

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Bibliographic Details
Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 1988-05, Vol.26 (5), p.1439-1456
Main Authors: Tacx, J. C. J. F., Van Der Velden, G. P. M., German, A. L.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary: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 δ 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 (σEE = 0.23, σSS = 0.39), whereas the ESE units are exhibiting a slight tendency toward isotacticity (σES = 0.66).
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.1988.080260516