Accession Number : AD0643232

Title :   DEGRADATION OF HALOPOLYMERS BY EXPOSURE TO HIGH-INTENSITY THERMAL PULSES.

Descriptive Note : Materials research and engineering rept.,

Corporate Author : ARMY NATICK LABS MASS CLOTHING AND ORGANIC MATERIALS DIV

Personal Author(s) : Barnes,William J. ; Yelland,William E. C.

Report Date : MAY 1965

Pagination or Media Count : 31

Abstract : Four series of halopolymers were exposed to high-intensity thermal energy pulses in a carbon arc-image furnace. By means of a 'closed-cell' technique, the thermal degradation products were collected and then analyzed by gas chromatographic procedures. Data were also obtained on the ignition and energy-dissipating characteristics of the halopolymers. The results indicate that: the ignition characteristics can be qualitatively predicted from the ratio of halogen to hydrogen atoms in the polymer; the energy-dissipating characteristics do not depend entirely on the halogen content of the polymers and are not related to their halogen/hydrogen ratios; copolymers can be synthesized to have low ignition frequencies and also good energy-dissipating characteristics; and, as the time of exposure to the thermal energy pulse increases, the nature of the mixture of gaseous thermal degradation products changes and new products appear in the mixture. (Author)

Descriptors :   (*HEAT SHIELDS, HALOCARBON PLASTICS), (*HALOCARBON PLASTICS, PYROLYSIS), THERMAL STABILITY, DEGRADATION, GAS CHROMATOGRAPHY, IGNITION, HEAT TRANSFER, VAPORS

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE