EFFECTS OF 80 MEV ELECTRON DAMAGE ON THERMAL PROPERTIES OF POLYSTYRENE.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Measurements of the thermal conductivity of polystyrene, irradiated with 80 Mev electrons, were made in the temperature range of 1.0 K to 5.0 K. Additionally, an estimate of the corresponding heat capacities was made. Samples irradiated received total doses of approximately 70, 200, 230, 550, and 1120 M rads. There was no observable effect, due to radiation induced crosslinks, on the thermal conductivity. The heat capacity, however, showed a marked decrease with increased dose. This effect is attributed to a reduction in the excess heat capacity of polystyrene, indicating that crosslinking has its greatest affect on the loosely bound polymer segments. Polymer characterization was accomplished by use of intrinsic viscosity and equilibrium swelling techniques. Author