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A high-field 13C-NMR study of the aqueous copolymerisation of acrylonitrile and vinyl acetate. Microstructural observations

✍ Scribed by Paul F Cheetham; Brian J Tabner

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
413 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

A~tract--A detailed examination has been undertaken of the high field t3C-NMR spectrum of various acrylonitrile/vinyl acetate copolymers prepared by radical initiation in a heterogeneous aqueous batch reaction (taken to low conversion). It has been possible to establish the triad, tetrad and pentad sequences for copolymers employing sequence patterns and peak fractions as an aid to peak assignments. These results indicate that the copolymer cotacticity is virtually independent of the comonomer feed ratio.

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## Abstract Complete analyses o the ^1^H NMR spectra of neomethyl iodide (1), the bromide (2) and the chloride (3) are reported. Of paticular interest is the very high‐field resonance at βˆ’0.16 ppm in 1 which is assigned to H‐4. The same poton in the bromide is also found upfield at 0.78 ppm. H‐4 in