DIFFUSION OF ORGANIC SOLVENTS IN ISOBUTYLENE-BASED POLYMERS

Hong SU; Duda JL; Venerus DC

Korean Journal of Chemical Engineering, Vol.13, No.3, 255-260, May, 1996

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 tem-perature range of 50 to 100℃ 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 tran-sition 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.

Keywords:Diffusion;Polymer;Solvent;Free-volume;Glass Transition

[References]

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Duda JL, Kimmerly GK, Sigelko WL, Vrentas JS, Ind. Eng. Chem. Fundam., 12, 135 (1973)
Duda JL, Vrentas JS, Ju ST, Liu HT, AIChE J., 28, 279 (1982)
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Hong SU, Ind. Eng. Chem. Res., 34(7), 2536 (1995)
Hong SU, Duda JL, J. Appl. Polym. Sci., 65(1), 51 (1997)
Hong SU, Benesi AJ, Duda JL, Polym. Int., 39, 243 (1996)
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[1] Arnould DD, "Capillary Column Inverse Gas Chromatography (CCIGC) for the Study of Diffusion in Polymer-Solvent Systems," Ph.D. Dissertation, The University of Massachusetts, Amherst, MA (1989)

[2] Bearman RJ, J. Phys. Chem., 65, 1961 (1961)

[3] Duda JL, Kimmerly GK, Sigelko WL, Vrentas JS, Ind. Eng. Chem. Fundam., 12, 135 (1973)

[4] Duda JL, Vrentas JS, Ju ST, Liu HT, AIChE J., 28, 279 (1982)

[5] Exxon Bromo XP-50 Brochure, "New Isobutylene-Based Elastomers for Outstanding Ozone, UV and Heat Resistance," Exxon Chemical (1991)

[6] Ferry JD, "Viscoelastic Properties of Polymer," 3rd ed., Wiley, New York (1980)

[7] Flory PJ, "Principles of Polymer Chemistry," Cornell University Press, Ithaca, NY (1953)

[8] Frensdorff HK, J. Polym. Sci. A: Polym. Chem., 2, 341 (1964)

[9] Haward RN, J. Macromol. Sci.-Rev. Macromol. Chem. Phys., C4, 191 (1970)

[10] Hong SU, "Molecular Diffusion of Organic Solvents in Multicomponent Polymer Materials," Ph.D. Dissertation, The Pennsylvania State University, University Park, PA (1994)

[11] Hong SU, Ind. Eng. Chem. Res., 34(7), 2536 (1995)

[12] Hong SU, Duda JL, J. Appl. Polym. Sci., 65(1), 51 (1997)

[13] Hong SU, Benesi AJ, Duda JL, Polym. Int., 39, 243 (1996)

[14] Ju ST, Liu HT, Duda JL, Vrentas JS, J. Appl. Polym. Sci., 26, 3735 (1981)

[15] Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)

[16] Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 417 (1977)

[17] Vrentas JS, Duda JL, Ling HC, Hou AC, J. Polym. Sci. B: Polym. Phys., 23, 289 (1985)

[18] Vrentas JS, Chu CH, J. Polym. Sci. B: Polym. Phys., 27, 1179 (1989)

[19] Vrentas JS, Vrentas CM, Macromolecules, 26, 6129 (1993)

[20] Williams ML, Landel RF, Ferry JD, J. Am. Chem. Soc., 77, 3701 (1955)

[21] Zielinski JM, "Free-Volume Parameter Estimations for Polymer-Solvent Diffusion Coefficient Predictions," Ph.D. Dissertation, The Pennsylvania State University, University Park, PA (1992)

[22] Zielinski JM, Duda JL, AIChE J., 38, 405 (1992)

[23] Zielinski JM, Benesi AJ, Duda JL, Ind. Eng. Chem. Res., 31, 2146 (1992)