Abstract
The influence of physical aging processes on the electret properties of amorphous poly(methyl methacrylate) was investigated. The experimental method of choice was the thermally stimulated discharge (TSD) technique. The result of these studies is that aging influences the magnitude of the electrical polarization within the glassy state and the thermal stability of the polarization originating from the frozen-in dipole orientation and from trapped charges. The effects of aging on electret properties can, to a good approximation, be accounted for on the basis of the phenomenological aging theory, as proposed by Kovacs et al. More detailed information on the relation between relaxation properties and aging of electret properties can be obtained from an analysis of the experimental results, based on the universal law approach, as proposed by Ngai et al.
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Kubon, U., Schilling, R. & Wendorff, J.H. Studies on the influence of physical aging processes on electret properties of amorphous poly(methyl methacrylate). Colloid & Polymer Sci 266, 123–131 (1988). https://doi.org/10.1007/BF01452809
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DOI: https://doi.org/10.1007/BF01452809