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Microstructure determination of the acrylonitrile–styrene–methyl methacrylate terpolymers by NMR spectroscopy

✍ Scribed by A. S. Brar; S. K. Hekmatyar

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
137 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

Acrylonitrile-styrene-methyl methacrylate (A-S-M) terpolymers were prepared by photopolymerization using uranyl nitrate ions as photo initiators, which were analyzed by NMR spectroscopy. The terpolymer compositions were determined by Goldfinger's equation using comonomer reactivity ratios: r as ϭ 0.04; r sa ϭ 0.31; r am ϭ 0.17, r ma ϭ 1.45; r sm ϭ 0.52; r ms ϭ 0.47. The terpolymer compositions were also determined from the quantitative 13 C( 1 H)-NMR spectroscopy. The sequence distribution of the acrylonitrile-, styrene-, and methyl methacrylate-centered triads were determined from the 13 C( 1 H)-NMR spectra of the terpolymers and are in good agreement with triad concentrations calculated from the statistical model.

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