Accession Number : ADA296991

Title :   Pyrolysis Gas Chromatography/Mass Spectrometry Identification of Elastomeric Materials.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Hiltz, John A. ; Power, John J.

PDF Url : ADA296991

Report Date : JUN 1995

Pagination or Media Count : 27

Abstract : Elastomers and thermoset polymers can be difficult to identify as a result of their crosslinked Structure. Techniques such as transmission infrared spectroscopy have limited application to these materials because of difficulty in preparing thin films. Surface infrared techniques including multiple internal reflectance and total attenuated reflectance are more useful but their application can be hampered by the presence of additives such as carbon and plasticizers. Pyrolysis coupled with gas chromatographic separation and mass spectrometric identification of degradation products provides a rapid reproducible method of degrading cross-linked materials and identifying their degradation products. As the degradation products are related to the structure of the polymer, these can be used to identify the polymer. In this paper, the pyrolysis products of samples natural rubber, butyl rubber, polychloroprene rubber, and three samples of polyacrylonitrile-butadiene rubber are studied to identify degradation products that are characteristic of each type of elastomer. Knowledge of characteristic degradation products allows the rapid, unambiguous identification of elastomer types. This information is critical in the selection of elastomers for use in a particular application or in determining why an elastomer failed in a particular environment. (MM)

Descriptors :   *ELASTOMERS, *GAS CHROMATOGRAPHY, *PYROLYSIS, *NITRILE RUBBER, *MASS SPECTROMETRY, *BUTYL RUBBER, *NATURAL RUBBER, INFRARED SPECTROSCOPY, DEGRADATION, POLYMERS, THIN FILMS, RUBBER, CARBON, IDENTIFICATION, CROSSLINKING(CHEMISTRY), REFLECTANCE, INFRARED RADIATION, REPRODUCIBILITY, CHROMATOGRAPHIC ANALYSIS, THERMOSETTING PLASTICS, PLASTICIZERS, CHLOROPRENES.

Subject Categories : Polymer Chemistry
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE