ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Some graft copolymerizations of monomers with substrates previously irradiated in air to form polymeric peroxides have been studied at pressures up to 8000 atm. In the heterogeneous system styrene-irradiated polyethylene, the rate of grafting increases considerably with pressure up to about 3000 atm. At higher pressures the reaction is retarded, and this is attributed to diffusion control of the propagation reaction. The rate of homopolymerization increases exponentially with pressure over the range 1-4000 atm. Irreproducible results were obtained when methyl methacrylate was used in place of styrene, possibly because the substrate is not swollen by this monomer. No grafting was observed between five different chloro-substituted ethylenes and irradiated polyethylene at pressures up to 5000 atm. The rate of grafting in the homogeneous system vinyl acetate-irradiated polystyrene increases considerably with pressure up to 8000 atm., and there is no indication of diffusion control of the propagation reaction.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020636
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