Sorption and transport of linear and branched ketones in biaxially oriented polyethylene terephthalate |
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| Authors: | Sushil N. Dhoot Mark E. Stewart |
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| Affiliation: | a Department of Chemical Engineering, Center for Energy and Environmental Resources, The University of Texas at Austin, 10100 Burnet Road, Building 133, Austin, TX 78758, USA
b Voridian Company, Division of Eastman Chemical Company, P.O. Box 2002, Kingsport, TN 37662, USA |
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| Abstract: | Equilibrium sorption and kinetics of acetone, methyl ethyl ketone (MEK), methyl n-propyl ketone (MnPK), and methyl i-propyl ketone (MiPK) uptake in uniform, biaxially oriented, semicrystalline polyethylene terephthalate films were determined at 35 °C and low penetrant activity. Sorption isotherms for all penetrants were well described by the dual-mode sorption model. Sorption and desorption kinetics were described either by Fickian diffusion or a two-stage model incorporating Fickian diffusion at short times and protracted polymer structural relaxation at long times. Diffusion coefficients and equilibrium solubility at fixed relative pressure decreased in the following order: acetone>MEK>MnPK>MiPK. Diffusion coefficients for each penetrant increased with increasing penetrant concentration. |
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| Keywords: | Gravimetric sorption Ketones Polyethylene terephthalate |
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