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- W2073646978 abstract "Experimental measurements have been made of the complex frequency-dependent shear modulus for hexachlorobiphenyl (Aroclor 1260) both with and without, in turn, helium- and argon-gas infusion to capacity, over the temperature range 5°–25°C and the pressure range ambient atmospheric to 4000 psi. Static viscosity results derived from the data are presented and analyzed with the aid of the Macedo–Litovitz hybrid equation to find changes in relative free volume brought about by rare-gas impregnation. Limiting high-frequency shear-compliance data are also presented, to which a phenomenological formulation for shear compliance in molecular-bonded liquids is applied as a means for assessing the additional equilibrium number of intermolecular bonds that are bent or broken under rare-gas infusion. Changes are noted in dynamic shear rigidity, loss modulus, and viscoelastic relaxation times brought about by the presence of each rare-gas impregnant in the recipient liquid, all as influenced by temperature and applied static pressure. Some effects on the dynamic shear spectra that are directly related to evaluated changes in free volume and intermolecular bond density are cited. We find that, except at low pressure, an increase in relative free volume is manifest upon Aroclor infusion with helium or argon gas over our temperature and pressure range. This added free-volume characteristic applies for all pressures at low temperatures where the free volume is small. The effect is found to be larger the higher the pressure (greater infusion) at all temperatures. Additional equilibrium numbers of broken bonds occurring upon infusion are enhanced with increasing temperature and, in general, with decreasing pressure. Viscoelastic relaxation times are decreased in Aroclor upon rare-gas impregnation, the reduction being more pronounced the lower the temperature or the higher the applied pressure. Infusion with the larger argon molecule has over all a more prominent impact on changes in free volume, bond density, and shear-rigidity spectra than has impregnation with helium molecules. However, no appreciable differences are detected between the two gas-infusion cases insofar as their impact on the relaxation time is concerned." @default.
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- W2073646978 date "1968-11-15" @default.
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- W2073646978 title "Liquid Viscoelasticity under Rare-Gas Infusion" @default.
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- W2073646978 doi "https://doi.org/10.1063/1.1669907" @default.
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