A novel technique for the quantitative measurement of gaseous uptake in organic polymers at high pressures

Abstract

A vibrating reed technique has been developed to determine the solubility of gases in organic polymers in hydrostatic gas pressure media. The method is believed to be novel and allows changes in mass to be computed to an accuracy of 0.5 mg in samples of ca. 2.5 g. The same apparatus allows relative gaseous density measurements to be made at high pressures. This paper briefly describes the development of the technique and illustrates the experimental procedures with reference to the sorption of nitrogen and helium into polytetrafluoroethylene, PTFE, up to a maximum pressure of 7400 p.s.i. ( approximately 51 MPa) in the temperature range of 0 degrees C to 70 degrees C.