Accession Number : ADA295506

Title :   Direct Exposure Probe/Mass Spectrometry and Pyrolysis-Gas Chromatography/Mass Spectrometry Study of the Effect of Gamma Radiation Exposure on the Thermal Degradation Products of Natural Rubber Polycaprolactone Mixtures.

Descriptive Note : Technical memo.,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Personal Author(s) : Hiltz, John A. ; Foster, Terry

PDF Url : ADA295506

Report Date : MAY 1995

Pagination or Media Count : 32

Abstract : This report describes the results of direct exposure probe-mass spectrometry and pyrolysis gas chromatography/mass spectrometry studies of the effect of gamma radiation exposure on the thermal degradation products of natural rubber, polycaprolactone, 70-30 and 30-70 mixtures of natural rubber and polycaprolactone. The degradation products and their relative abundances of the natural rubber, polycaprolactone, and the 70-30 natural rubber - polycaprolactone mixture were similar before and after gamma radiation exposure. However, gamma radiation exposure did have an effect on the degradation products of the 30-70 natural rubber - polycaprolactone mixture. Prior to gamma radiation exposure, the degradation products of this mixture consisted of compounds characteristic of the two components of the mixture, while following gamma radiation exposure the degradation products were characteristic of the polycaprolactone portion of the mixture. Degradation products from the natural rubber portion of the mixture were not observed. Although this suggests that gamma radiation exposure changed the structure of the mixture, other techniques, such as sol gel analysis or molecular weight determination, are required to determine how the structure has changed. jg

Descriptors :   *PROBES, *RADIATION, *EXPOSURE(GENERAL), *GAMMA RAYS, *THERMAL DEGRADATION, *GAS CHROMATOGRAPHY, *PYROLYSIS, *MASS SPECTROMETRY, *CAPROLACTONES, *NATURAL RUBBER, DEGRADATION, POLYMERS, MOLECULAR WEIGHT, CANADA, MIXTURES, GELS.

Subject Categories : Elastomers and Rubber
      Organic Chemistry
      Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE