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- W4762142 abstract "Electrical problems in a neutron generator initiated a study of the aging characteristics of the polyurethane/butanediol/trimethylolpropane system. Judging from adhesion measurements and a tensile strength/elongation ratio (S/E), material that was shelf-aged from 1970 through 1976 still had high adhesion (90 lb/in./sup 2/) and excellent flexibility (65 S/E). From 1979 through 1980, parameters decayed rapidly displaying 44 lb/in./sup 2/ adhesion and 92 S/E with 28 percent zero adhesion. Under normal storage, material adhesion deteriorated to 0 lb/in./sup 2/ in 25 to 27 weeks, while at 95 percent relative humidity adhesion deteriorated to 0 lb/in./sup 2/ in just six weeks. Moisture was pinpointed as the causative agent. To assess product reliability, accelerated aging tests were initiated to obtain the activation energy of aging, which was found to be 30.6 kcal/mole. Based on this, air oven aging for 23 days at 60/sup 0/C would provide aging equivalent to 20 years at 23/sup 0/C. Evaluation of this is in progress. To protect the system from moisture effects, a silane adhesion promoter was added in one percent quantities. This provided a nominal adhesion of 130 lb/in./sup 2/ and an S/E value of 23. Over a seven month aging period at 95 percent relative humidity, adhesionmore » improved by 50 percent. The physical, electrical and outgassing characteristics of the silane stock was equivalent to the polyurethane control. For comparison purposes, and to set up conditions for evaluation of the silane system, a program was initiated to determine the aging activation energy using normal air oven aging and aging at various humidity levels.« less" @default.
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- W4762142 date "1981-08-31" @default.
- W4762142 modified "2023-09-27" @default.
- W4762142 title "Aging of Adiprene L-100/butanediol/trimethylolpropane stocks" @default.
- W4762142 hasPublicationYear "1981" @default.
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