Complete spectral assignments of methacrylonitrile–styrene–methyl methacrylate terpolymers by 2D NMR spectroscopy

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Date
2003
Authors
Brar, A S
Pradhan, D R
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Abstract
Methacrylonitrile–styrene–methyl methacrylate (N/S/M) terpolymers of different monomer concentrations were prepared by bulk polymerization. The terpolymer compositions were determined by quantitative 13C{1H} NMR spectra and compared with those calculated by Goldfinger’s equation using comonomer reactivity ratios: rNS ¼ =0.30, rSN ¼= 0.45; rNM ¼= 0.91,rMN ¼ =0.88; rSM ¼= 0.52, rMS ¼= 0.47. The overlapping and complex 13C{1H} and 1H NMR spectra of the terpolymers were assigned with the help of distortionless enhancement by polarization transfer and two-dimensional (2D) 13C–1H heteronuclear single quantum coherence experiments. The various vicinal and geminal couplings between the protons in the polymer chains can be seen in the 2D total correlated spectroscopy experiments.
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Sequence distribution, Two-dimensional NMR, Methacrylonitrile–styrene–methyl methacrylate terpolymer, Multicomponent
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