Accession Number : ADA307285

Title :   Synthesis and Evaluation of Polymers for Use in Early Warning Fire Alarm Devices.

Descriptive Note : Contractor rept.,

Corporate Author : MCDONNELL DOUGLAS CORP LONG BEACH CA DOUGLAS AIRCRAFT DIV

Personal Author(s) : Byrd, N. R. ; Sheratte, M. B.

PDF Url : ADA307285

Report Date : FEB 1975

Pagination or Media Count : 126

Abstract : Eight conjugated polyacetylene polymers and one condensation polyene, all containing a high degree of conjugated unsaturation, were synthesized. These polymers were characterized by chemical analysis and by thermogravimetric analysis, as well as for their film-forming capability and gas/polymer interactions. It was found that those that had a high degree of conjugated unsaturation and had resonance - stabilizing groups were very thermally stable to 200 deg C, e.g., poly(dicyanoacetylene), poly(ethynylferrocene) and poly(phenylacetylene); while those with labile moieties, such as poly(p-formamidophenylacetylene), among others, suffered some degradation when heated in air. When subjected to gas/polymer interaction effects, the greatest change in electrical conductance was observed when ammonia was used as the gas and poly(p-nitrophenylacetylene) was the detector. Other polymers showed similar behavior. For example, poly(ethynylcarborane), considered to be an electron acceptor also showed a change in electrical conductance when exposed to ammonia, while poly(ethynylpyridine) and poly(ethylidenepyridazine) responded to carbon monoxide. However, for 'fire gases' (gases from smoldering cotton), poly(ethynylferrocene) was the most responsive. Thus, the concept of polymers with different electronegativities forming charge-transfer complexes with different gases was found to be operable.

Descriptors :   *POLYMERS, *EARLY WARNING SYSTEMS, *FIRE ALARM SYSTEMS, TEST AND EVALUATION, STABILIZATION, DEGRADATION, EXPOSURE(GENERAL), INTERACTIONS, SYNTHESIS, FILMS, ELECTRICAL CONDUCTIVITY, AMMONIA, GASES, ACETYLENE, FIRES, CARBON MONOXIDE, ELECTRON ACCEPTORS, CHEMICAL ANALYSIS, COTTON, ACETYLENES, THERMOGRAVIMETRIC ANALYSIS.

Subject Categories : Polymer Chemistry
      Physical Chemistry
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE