Creep of fluoroplastic under the joint action of tension and hydrostatic pressure
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1. The effect of hydrostatic pressure on the creep of Teflon has been investigated under isothermal conditions. The applicability of the principle of reduced variables for reduction of creep curves with respect to pressure has been shown.
2. It has been ascertained that in the pressure region from atmospheric to 1600 kgf/cm2 there are two subregions, which are separated by a transition at a pressure of 700–800 kgf/cm2. It has been shown that in these subregions the occurrence of relaxation processes has different characters.
3. A direct measurement of the free volume of Teflon has been made in the temperature range from 40 to 120°C. A sharp increase in free volume in the region of the temperature transition has been shown.
KeywordsTemperature Transition Direct Measurement Hydrostatic Pressure Sharp Increase Relaxation Process
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