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The extraction of admixed polymers from natural rubber vulcanizates
Author(s) -
Cooper W.,
Smith R. K.
Publication year - 1962
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1962.070061907
Subject(s) - vulcanization , natural rubber , polystyrene , polymer , materials science , extraction (chemistry) , solvent , copolymer , polymer chemistry , styrene , composite material , chemical engineering , chemistry , organic chemistry , engineering
Extraction by solvent of admixed polymethyl methacrylate or polystyrene from natural rubber vulcanizates is dependent on the crosslink density, the solvent, the molecular weight of the polymer, and the size of sample extracted. High molecular weight polymer is extracted very slowly, and in some cases several weeks of continuous extraction have been found necessary. The rate of extraction is increased, as would be expected, by solvents which swell the rubber strongly, and by increase in temperature of extraction. In some cases the vulcanization procedure degrades the polymer, while in others there is a possibility of cocrosslinking the rubber and polymer. Graft copolymers from rubber and methylmethacrylate or styrene possess similar characteristics when vulcanized. In consequence, analysis of the content of free homopolymer is subject to considerable uncertainty. In the analysis of these rubber–polystyrene mixtures by ozonolysis, polystyrene was found to be very susceptible to attack by ozone.