On the copolymerization rate of vinyl monomers in binary systems

Kucher, R; Zaitsev, Yu.S.; Bondarenko, A. V.; Zaitseva, V. V.

doi:10.1007/bf00519067

Cited by 5 publications

(2 citation statements)

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“…The sequence distributions of acrylonitrile-styrene copolymers were analyzed by 13C NMR spectroscopy by a Weight percent of total monomer feed. 6 From % N elemental analysis: estimated error in Yg +1.6%. c From numberaverage sequence lengths: ñg/(ñg + ñA), calculated from triad fractions.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the mechanism of copolymerization of styrene and acrylonitrile

Hill¹,

O’Donnell²,

O'Sullivan³

1982

Macromolecules

173

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The copolymerization of styrene and acrylonitrile in bulk at 60 °C has been investigated by measurement of the copolymer/comonomer composition relationship and of the monomer sequence distributions using 13C NMR. Alternative models for the mechanism of the copolymerization have been evaluated in the most general forms, with allowance for nonzero conversions, by deriving reactivity ratios from composition data and then comparing predicted and experimental sequence distributions. The system shows significant deviations from the terminal model. Compositions cannot differentiate between penultimate and complex participation models, both of which give significant improvement over the terminal model. The measured sequence distributions are quite close to the predictions of the penultimate model but substantially different from those of the complex participation model, showing clearly that the penultimate model is the most appropriate of the models considered. We have obtained rss = 0.22g, rM = 0.03g, r^= 0.634, and rSA = 0.09v No significant improvement was observed with the antepenultimate model.

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Section: Introductionmentioning

confidence: 99%

“…Figure6. Number fraction of acrylonitrile sequences of length two in copolymers of acrylonitrile and styrene: symbols as for Figure3.…”

mentioning

confidence: 99%

Analysis of the mechanism of copolymerization of styrene and acrylonitrile

Hill¹,

O’Donnell²,

O'Sullivan³

1982

Macromolecules

173

View full text Add to dashboard Cite

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Evaluation of alternative models for the mechanism of chain‐growth copolymerization

Hill

O’Donnell

1987

Makromolekulare Chemie. Macromolecular Symposia

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A general method for discriminating between different models for chain‐growth copolymerization is described. The method is based on the non‐linear least‐squares analysis of variations in the copolymer compositions or sequence distributions with the compositions of the monomer feed mixture. It allows the best values for the reactivity ratios for each model to be evaluated, and their joint confidence regions to be delineated. The method is demonstrated by applications to the copolymerizations of styrene with acrylonitrile and maleic anhydride.

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