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Positron annihilation studies of moisture in graphite-reinforced composites (1980)

Mock, W., Jr. ; Buckingham, R. D. ; Singh, J. J. ; [et al.]

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Publication Date: 2011-08-18

Description: The positron lifetime technique of monitoring absorbed moisture is applied to several composites, including graphite/polymides which are candidates for high-temperature (over 260 C) applications. The experimental setup is a conventional fast-slow coincidence system wherein the positron lifetime is measured with respect to a reference time determined by the detection of a nuclear gamma ray emitted simultaneously with the positron. From the experiments, a rate of change of positron mean lifetime per unit mass of water can be determined for each type of specimen. Positron lifetime spectra are presented for a graphite/polyimide composite and for a pure polyimide.

Keywords: COMPOSITE MATERIALS

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