Measurements have been made to determine the effect of temperature and elevated-temperature preconditioning on the outgassing rate of double-aluminized mylar (DAM) and dacron net (DN), two materials used in multilayer insulation systems. The outgassing rate of DAM was measured at seven constant temperatures between 219 and 394 K, while that of DN was measured at six temperatures between 275.7 and 399 K for 7 days each. The isothermal DAM measurements permitted analytical expressions to be derived for the outgassing rate, from which diffusion coefficient and activation energies could be derived. The effect of elevated-temperature preconditioning on long-term outgassing rate at 298 K was determined in a series of tests on both DAM and DN, in which the samples were heated for 24 h in vacuum to various elevated temperatures between 298 and 423 K, then returned to 298 K, at which temperature their outgassing rate was measured for the next 6 days. It was found that there is an optimum preconditioning temperature for DAM in the region of 343 to 363 K. Preconditioning above this temperature actually increases the long-term outgassing rate at 298 K. For DN, raising the preconditioning temperature steadily lowers the long-term 298 K outgassing rate. In general, elevated temperature preconditioning is more effective for DN than DAM.
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