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• W2065654846 startingPage "167" @default.
• W2065654846 abstract "Gas sorption isotherms for N2, Ar, CH4, and CO2 have been measured at various temperatures for poly(ethyl methacrylate) (PEMA) below its Tg. For the three low solubility gases, N2, Ar and CH4, the sorption isotherms are concave as predicted for glassy polymers but the amount of sorption in PEMA is much lower than that in high Tg polymers. For the higher solubility gas CO2, however, the amount of sorption is the same as that in high Tg polymers. The CO2 isotherms changed from concave at low pressures to a straight line at high pressures, which can be extrapolated to the origin of the coordinates, indicating the PEMA is plasticized by CO2 from the glassy to the rubbery state. The sorption parameters for CO2 are derived from a modified dual mode sorption equation which considers the plasticizing effect. New findings about these parameters and the derived enthalpy change on sorption are reported. Gas permeability coefficients for PEMA to He, H2, O2, Ar, N2, and CH4 measured at 35°C are observed to be independent of pressure. On the other hand, the CO2 permeability coefficients increase with pressure. Appropriate models are used to describe this transport behavior. Evidence from gas sorption and DSC thermograms show that PEMA can sub-Tg anneal under CO2 plasticization. However, when the Tg is depressed by plasticization below the observation temperature, the annealing effect is erased. This leads to complex behavior as described." @default.
• W2065654846 created "2016-06-24" @default.
• W2065654846 creator A5005843396 @default.
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• W2065654846 date "1989-07-01" @default.
• W2065654846 modified "2023-10-13" @default.
• W2065654846 title "Gas sorption and permeation in poly(ethyl methacrylate)" @default.
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• W2065654846 doi "https://doi.org/10.1016/s0376-7388(00)80852-2" @default.
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