Synthesis of styrene–methyl methacrylate nonrandom copolymers in emulsion systems with cobalt-60 gamma radiation

Autor:	G. J. K. Acres, F. L. Dalton
Rok vydání:	1963
Předmět:	chemistry.chemical_classification Materials science General Medicine Polymer Styrene chemistry.chemical_compound Monomer chemistry Methacrylic acid Polymerization Polymer chemistry Copolymer Polystyrene Methyl methacrylate
Zdroj:	Journal of Polymer Science Part A: General Papers. 1:2419-2438
ISSN:	1542-6246 0449-2951
DOI:	10.1002/pol.1963.100010719
Popis:	Graft copolymers have been prepared by the irradiation of polymer latices swollen with monomer. The latices used were prepared by radiation polymerization of emulsions to avoid the presence of initiator molecules in the second stage. Latices of polystyrene swollen with methyl methacrylate and polymethyl methacrylate swollen with styrene have been used. Polymerizations were followed dilatometrically and the dependence of polymerization rate on monomer concentration and radiation intensity obtained for both systems studied. Separation of copolymer from homopolymers has been attempted by thermal gradient elution chromatography; the method proved satisfactory when the solvent—nonsolvent system benzene—petroleum ether was used, but failed to give separations when benzene—methanol was used. This failure is thought to be due to cosolution phenomena.
Databáze:	OpenAIRE
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