Abstract
THE electric strength of irradiated polythene has been measured for material cross-linked by exposure to 4-MeV. electrons from a linear accelerator. Thin (1-mm.) moulded disks of material (average molecular weight, 17,000) recessed to a thickness of about 50 microns were irradiated in vacuo with doses of 150–300 Mrad , and the electric strength afterwards measured with direct voltage, using techniques described by Bird and Pelzer1, and Ball2. Control results for normal material coincide with those of other investigations1,3 to give curve C of Fig. 1; results for the irradiated material are shown by lines A and B. The changes in electric strength due to irradiation unexpectedly resemble those of Young's modulus for similar material measured by Charlesby and Hancock4. They are quite unlike those expected from the theory of intrinsic electric strength5, which predicts for the cross-linked material a fall with temperature more marked than that of curve C, and beginning at a lower temperature.
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References
Bird, D. W., and Pelzer, H., Proc. Inst. Elect. Eng., 96, Part 1, 44 (1949).
Ball, I. D. L., Proc. Inst. Elect. Eng., 98, Part 1, 84 (1951).
Oakes, W. G., Proc. Inst. Elect. Eng., 96, Part 1, 37 (1949).
Charlesby, A., and Hancock, N. H., Proc. Roy. Soc., A, 281, 245 (1953).
Whitehead, S., “Dielectric Breakdown of Solids” (Oxf. Univ. Press, 1951). Fröhlich, H., Proc. Roy. Soc., A, 188, 521 (1947). Fröhlich, H., E.R.A. Report Ref. L/T169.
Moll, H. W., and LeFevre, W. J., Indust. and Eng. Chem., 40, 2172 (1948).
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STARK, K., GARTON, C. Electric Strength of Irradiated Polythene. Nature 176, 1225–1226 (1955). https://doi.org/10.1038/1761225a0
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DOI: https://doi.org/10.1038/1761225a0
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