Diffusion of organic solvents in isobutylene-based polymers |
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| Authors: | Seong-Uk Hong J. Larry Duda David C. Venerus |
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| Affiliation: | (1) Department of Chemical Engineering, The Pennsylvania State University, University Park, 16802, PA, USA;(2) Department of Chemical Engineering, Illinois Institute of Technology, 60616 Chicago, IL, USA;(3) Department of Chemical Engineering, The Johns Hopkins University, 21218-2694 Baltimore, MD, USA |
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| Abstract: | Diffusion behavior of several organic solvents in polyisobutylene (PIB) and in poly(p-methylstyrene-co-iso-butylene) (PMS-BR) with different monomer ratios has been studied. The experiments have been conducted over a temperature range of 50 to 100°C using a conventional gravimetric Sorption technique. The PMS-BR copolymers contained 2, 7, and 15 weight percent p-methylstyrene, respectively. Although employing temperatures were far above the glass transition temperatures of polymers, the diffusion coefficients are correlated well with the Vrentas-Duda free-volume theory. For all the solvents, the PIB shows the highest diffusivity while the copolymer with the 15% p-methylstyrene gives the lowest value. This behavior can be explained by the amount of fractional free-volume present in a system. |
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| Keywords: | Diffusion Polymer Solvent Free-volume Glass Transition |
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