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EFFECTS OF REACTOR RADIATION AND TEMPERATURE EXPOSURE ON A SOLID POLYURETHANE ELASTOMER AND A POLYURETHANE FOAM.
GENERAL DYNAMICS/FORT WORTH TEX
A poolyurethane elastomer and a polyurethane foam have been irradiated to six gamma dose levels in the range of from 3 x 10 to the 8th power to 9 x 10 to the 10th power ergsgmC at 75F and 240F. The elastomer was irradiated as tensile specimens and compressed buttons and the foam was irradiated as compressed and uncompressed buttons. Tensile properties, hardness, compression set, weight chaahhange, and specific gravity were measured for the elastomer. Compression set, compression load deflection, and density were measured for the foam. The data were analyzed by use of several theoretical and empirical equations to obtain molecular interpretation of the radiation effects. Molecular weight between crosslinks, based on stress-strain data for the elastomer, and the rate constant for chain cleavage from stress relaxation in the foam were obtained as a function of radiation dose. Also, the network chains effective in creating compression set were calculated for both materials. The elastomer is considered to be a radiationresistant material up to a dose to 10 to the 10th power ergsgmC. The foam appears to be a favorable material for use in the radiatioion fields at moderate temperature and dose. Author
Final rept. for 1 Oct 63-30 Sep 64,
AF29 601 6213