Transport of gases in unmodified and arylbrominated 2,6-dimethyl- 1,4-poly (phenylene oxide) |
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| Institution: | 1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, PR China;2. Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, PR China;3. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, PR China;1. Russian scientific center \"Applied chemistry\", 26A Krylenko ul., St. Petersburg, 193232, Russia;2. A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 26 Leninsky pr., 119991, Moscow, Russia;3. The Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, Moscow Region, 141701, Russia;1. Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan, ROC;2. School of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan, ROC;3. Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan, ROC |
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| Abstract: | Independent solubility and permeability data, measured at 35°C at up to 26 atm, are reported to show the influence of aryl-bromination on the transport of CO2, CH4, and N2 in 2,6-dimethyl-1,4-poly(phenylene oxide) (PPO). The permeability of PPO was found to vary with the extent of bromination, and the magnitude of change depends on the nature of the gas. The apparent solubility coefficients of all three gases at 20 atm in the polymer increased with the extent of bromination, and the percentage of increase was higher for the gas with lower condensability. The concentration-averaged diffusivities of CO2 and CH4 also showed some variation with the extent of bromination. In particular, there was a notable increase in the diffusivity of CO2 but a slight decrease in that of CH4 when the extent of bromination was increased to 91%. The gas-transport data were also analyzed according to the dual-mode model. The dual-mode parameters exhibit similar dependence on the extent of bromination as the apparent solubility coefficient and concentration-averaged diffusivity do. These observations are interpreted in terms of changes in the average packing, torsional mobility of the chain segments, and cohesive energy density of the polymer. |
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