Measurement of sorption in polymer membranes with a quartz crystal microbalance |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China;2. School of Environment, Beijing Normal University, Beijing 100875, China;1. School of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266000, China;3. School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450000, China;4. Marine Science Research Institute of Shandong Province, Qingdao 266104, China;1. College of Agricultural Engineering and Food Science, Shandong University of Technology, No. 266 Xincun Xilu, Zibo, Shandong 255049, China;2. Shandong Provincial Engineering Research Center of Vegetable Safety and Quality Traceability, No. 266 Xincun Xilu, Zibo, Shandong 255049, China;3. Zibo City Key Laboratory of Agricultural Product Safety Traceability, No. 266 Xincun Xilu, Zibo, Shandong 255049, China |
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| Abstract: | An application of the oscillating quartz crystal microbalance (QCM) in the measurements of sorption rates and equilibria in polymer—vapor systems is presented. The sorption isotherms of methanol, ethanol and n-heptane in cellulose acetate and poly(hexamethylene adipamide) were measured with the QCM at 298K. The results agree reasonably with the Flory model except at low absorbate activities where appreciable deviations due to localized absorption were observed, as verified with IR spectroscopy. The diffusion coefficient of methanol in cellulose acetate was also calculated from the sorption rate data measured with the QCM. The values obtained at different methanol concentrations correlate well with the published diffusion coefficients. |
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