Abstract
A torsion pendulum has been used to measure the shear modulus of a range of polymers as a function of applied hydrostatic pressure at 20° C. The pressure medium was usually nitrogen gas and the maximum pressure 20000 psi. The results show that the shear modulus of each polymer is increased by the application of pressure, and the magnitude of the increase is greatest for experiments carried out at temperatures just above an atmospheric relaxation temperature. The increase in shear modulus takes a finite time, of the order of minutes, to be achieved, the equilibrium value being reached in a shorter time at higher temperature.
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Jones Parry, E., Tabor, D. Pressure dependence of the shear modulus of various polymers. J Mater Sci 9, 289–292 (1974). https://doi.org/10.1007/BF00550953
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DOI: https://doi.org/10.1007/BF00550953