Accession Number : AD0611575

Title :   X-RADIATION-INDUCED UNSATURATION CHANGES IN MARLEX 6002 POLYETHYLENE.

Descriptive Note : Rept. for 1 Oct 63-30 Sep 64,

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : Hill,O. H. ; Albrecht,T. W.

Report Date : JAN 1965

Pagination or Media Count : 48

Abstract : An irradiation-dewar assembly was designed for use with an infrared spectrophotometer so that selected organics could be intermittently monitored during X-irradiation with maximum environmental and temperature integrity of the sample. This assembly was employed to study the temperature dependence of the rates of change of unsaturation in Marlex 6002 polyethylene. The initial rate of radiation-induced trans-vinylene formation in Marlex 6002 polyethylene is found to be 2.0=0.3 bonds per 100 ev and independent of temperature over the range of from 105 to 300K, while vinyl decay extrapolated to zero radiation dose over the same range satisfies G(-Vi) = 5.8 exp (341 (1/300 - 1/T)), with G(-Vi) representing the number of vinyl bonds disappearing per 100 ev absorbed at absolute temperature T(K). The process of transvinylene elimination has been observed qualitatively to be temperature-dependent over this temperature range. A 1-atm pressure of hydrogen does not change unsaturation rates. The techniques employed have certain advantages in fundamental radiation chemistry studies.

Descriptors :   (*POLYETHYLENE PLASTICS, RADIATION CHEMISTRY), (*RADIATION CHEMISTRY, POLYETHYLENE PLASTICS), DECOMPOSITION, GASES, MONITORS, INFRARED SPECTROPHOTOMETERS, INFRARED SPECTROSCOPY, REACTION KINETICS, HYDROGEN, PRESSURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE