The Radiolysis of the Xylene Isomers and Ethylbenzene

Abstract

The G-values f o r the formatLon of H2 and CH4 in tne 6 0~o y-radiolysis of the xylene isomers and ethylbenzene have been compared. The presence of iodine does not a f f e c t OH2, but reduces GCH4 t o a limiting value. Por p-xylene %2 and the unscavengeable CH4 yield a r e independent of temperature from 20' t o 1 1 0 ' C, whereas the t o t a l CH4 yield increases s i x f o l d over thds range. The H2 and CH4 yields a r e greatly reduced i n t h e solid s t a t e , and i n the liquid s t a t e benzene shows a protective effect on the wields of both gases. The formation of CH4 and C2 -hydrocarldbns was c o~. with the C6 -and C, -products f o r p-xylene and ethylbenzene, and isom,:isation has been shown t o occur t o a negligible exte:.~. The production of high molecular weight products was measured f o r the xylenes, and i s independent of dose r a t e and temperature f o r liquid p-xylene, but i s decreased i n t h e s o l i d s t a t e . The r e s u l t s are q u a l i t a t i v e l y consistent with the reactions of radicals and exc i t e d molecules. L E G A L N O T I C E

Interaction of water with epoxy.

“…Ball et al [2003] have examined the water leaching of these solvents from paint. Verdin [1963] has examined the radiolysis of xylene isomers and ethyl benzene with and without molecular iodine present. He finds the predominant products of radiolysis are hydrogen (G~0.2 molecules/ 100eV absorbed dose), methane (G~0.014) and a polymeric hydrocarbon (G~1.0) having a molecular weight of about 270.…”

Aromatic units from the macromolecular material in meteorites: Molecular probes of cosmic environments

“…Further irradiation represents a potential degradation mechanism. By monitoring the production of hydrogen and methane during irradiation of dimethyl benzene isomers it was recognised that the meta isomer is relatively resistant (Verdin, 1963), suggesting that irradiation could be a process in which the dominance of metaforms is enhanced. In this context it is possible to consider the agglomeration and transformation of meta units into meteorite macromolecular materials.…”

Strahlungschemie von Kolhenwasserstoffen 10. Mitteilung Let‐Effekte in Toluol

“…Ein sich konkurrenzierendes System von Abstraktions-und Rekombinationsreaktionen miisste sich zudem durch einen temperaturabhangigen G-Wert ausdrucken. Eine solche Abhangigkeit wurde jedoch weder im Fall des Toluols [13] noch im Fall anderer Arornaten wie Benzol [l] [4] oder Athylbenzol und Xylol [14] festgestellt. Die Bildungswerte solcher Produkte, die auf Abstraktion oder Addition von Wasserstoff beruhen, nehmen ebenfalls zu.…”