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Permittivity of poly(tetrafluoroethylene) (PTFE) was measured while subjected to tensile stress. It was observed that the permittivity of PTFE decreases with increasing tensile strain; by approximately 10 % at 140 % longitudinal strain. Comparing porosity values calculated from a) measurements of sample density, and from b) measured permittivity by means of a simple mixture formula, it is shown that...
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