Study of the mechanism of styrene-rubber graft copolymerization

Three stages were found when styrene was graft-copolymerized with rubber, i.e. up to 40–55% polymerization, in which there is a continuous increase in the quantity of graft copolymer, from 40–55 to 94–98%, in which there is hardly any grafting, and the final stage in which there is a 1·7–2·3 fold in...

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Bibliographic Details
Published in:Polymer science USSR 1974, Vol.16 (9), p.2332-2341
Main Authors: Yenal'ev, V.D., Noskova, N.A., Popov, I.S.
Format: Article
Language:English
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Summary:Three stages were found when styrene was graft-copolymerized with rubber, i.e. up to 40–55% polymerization, in which there is a continuous increase in the quantity of graft copolymer, from 40–55 to 94–98%, in which there is hardly any grafting, and the final stage in which there is a 1·7–2·3 fold increase of the amount of graft copolymer. The suggested mechanism for polystyrene (PS) grafting on to rubber in the third stage is a reaction of the large molecular weight fractions and of the growing PS radicals with the double bonds of the rubber; but there is another partial mechanism of trapping the occluded PS by the rubber phase. The intense gel formation during stage 3 is explained by crosslinking of the macromolecular chains of rubber by means of the growing PS radicals. The cast-moulding properties of impact resistant PS were found to depend on its micro structure and the crosslinking density of the network present in the gel.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(74)90234-2