ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The crosslinking and degradation of seven polyacrylates by 1000 kvp. electrons has been investigated. Gel content-radiation dose analysis reveals the energy dissipation per main-chain fracture, Ed, to be the same (530 ± 100 electron volts) for methyl, n-butyl, sec-butyl, isobutyl, and tert-butyl acrylate polymers. The energy dissipation per crosslinked unit formation, Ec, is 80-90 e.v. for methyl, n-butyl, isobutyl and neopentyl acrylate polymers. Ec may be slightly higher for poly-sec-butyl acrylate. Poly-tert-butyl acrylate possesses a uniquely high Ec of 300 e.v. The presence of hydrogen atoms alpha to the alcoholic oxygen of the ester group is believed to contribute strongly to the crosslinking reactions of polyacrylates under ionizing radiations. Poly-1,1-dihydroperfluorobutyl acrylate exhibits an initial Ec of ∼45 e.v. and an Ed of ∼450 e.v. Beyond 15 megareps the ration of main-chain fracture to crosslink formation increases.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1956.1202210214
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