Free volume analysis of organic vapor diffusion in polyurethane membranes
作者： Ravi Ponangi , PN Pintauro , D De Kee
DOI: 10.1016/S0376-7388(00)00490-7
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摘要: Mutual diffusion coefficients of penetrant–polymer systems comprising two organic compounds (benzene and tetrachloroethylene) four polyurethane membranes (spandex from E.I. du Pont de Nemours & Company, Inc., three Estane® polymers B.F. Goodrich Speciality Chemicals) were measured as a function temperature (30–60°C) vapor activity by performing transient desorption experiments with McBain quartz-spring microbalance apparatus. Diffusion increased decreased polymer hard segment content. Fujita’s free volume theory, corrected for the presence domains in polyurethanes, described well dependence penetrant on concentration temperature. Equations correlating parameters to morphology, quantified hydrogen bonding index (HBI), generated. These equations, combination Flory–Rhener equation benzene tetrachloroethylene sorption morphology correlations parameters, able predict within 12% mutual concentration, temperature,
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