The properties of poly(tetrafluoroethylene) (PTFE) in compression
نویسندگان
چکیده
Samples of DuPont 7A and 7C Teflon (PTFE, poly(tetrafluoroethylene)) were tested in compression at strain-rates between 10 and 1 s and temperatures between K198 and 200 8C. Additionally, using a Split-Hopkinson pressure bar, a temperature compression series was undertaken between K100 and 150 8C at a strain rate of 3200 s. To investigate the small-strain response, strain gauges were used to measure axial and transverse strain allowing the Poisson ratio to be quantified. As expected, the mechanical properties were found to be strongly affected by strain-rate and temperature. Moduli were found by several methods and the trend, with respect to temperature, lends weight to the suggestion that the glass-transition temperature of PTFE is zK100 8C. The physical properties of the sintered PTFE were measured and the crystallinities measured by several techniques. q 2004 Elsevier Ltd. All rights reserved. PACS: 62.20.Dc; 81.05.Lg; 85.35.Lr
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