Fibre-on-plate experiments: relaxation and surface tension
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The relaxation of the fibre-on-plate geometry was studied experimentally using glass. Various fibre diameters and temperature/time schedules were used. Excellent agreement with the theoretical predictions of Hopper was obtained. The determination of the surface tension of glass at low temperature by this method is discussed. A value of 0.19 N m−1 at 600 °C was measured for a modified Na-K-Ba-Sr-silica glass, which differs significantly from the sessile-drop value of 0.35 N m−1, extrapolated from high-temperature data. Influencing factors are discussed. The difference is probably due to the presence of water vapour which considerably lowers the surface tension of glass at low temperature.
KeywordsPolymer Surface Tension Water Vapour Theoretical Prediction Excellent Agreement
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