Accession Number : AD0740292

Title :   Thermal Regeneration of the Tensile Properties of Hydrolytically Degraded Polyimide Film.

Descriptive Note : Research memo.,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s) : DeIasi,Richard

Report Date : APR 1972

Pagination or Media Count : 26

Abstract : Heat treatment at temperatures of 224 to 310C of hydrolytically degraded polyimide film has been shown to regenerate the ultimate tensile strength from 15.1 ksi to 24.3 ksi after 80 hours at 224C and to 25.8 ksi after two hours at 310C, whereas the elongation to failure is simultaneously increased from 4.8 to 29.0 percent at 224C and to 38.4 percent at 310C. The kinetics of this regeneration indicate that the reaction corresponds to the two-step recombination of the hydrolytically attacked amide linkages that were initially present in the 'as-received' polyimide film. The regenerated polyimide exhibits a much improved hydrolytic stability over the untreated material and specimens heat treated directly without prior aqueous degradation. (Author)

Descriptors :   (*HEAT RESISTANT PLASTICS, HYDROLYSIS), (*HEAT RESISTANT PLASTICS, *HEAT TREATMENT), HYDROLYSIS, IMIDES, REACTION KINETICS, FAILURE(MECHANICS), THERMAL STABILITY, FILMS, TENSILE PROPERTIES

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE