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• W3109416095 endingPage "123271" @default.
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• W3109416095 abstract "Polymer of intrinsic microporosity (PIM-1) was prepared according to a new procedure – precipitation polycondensation in DMSO solution. The permeability coefficients were determined in the “as cast” and ethanol treated samples of this material. It was shown that permeability of the novel polymer is higher than that of PIM-1 samples prepared according to the traditional methods, while selectivity was lower. Free volume in the novel PIM-1 was studied using the PALS technique. Positron life time parameters and the radii of free volume elements were virtually the same as in PIM-1 samples investigated earlier. The samples of novel PIM-1 were subjected to treatment by supercritical CO 2 and annealing of free films and films in strained state. The treatment with scCO 2 leads qualitatively to the same results as insertion of the films into EtOH (increase in gas permeability) although the observed P i values are somewhat lower. Annealing of the films in strained and free state causes significant decrease in gas permeability with respect to all the gases but increase in selectivity. This effect is rather strong, so some the data points are even located above the Upper Bound 2008 in Robeson diagrams. Aging of PIM-1 samples for 30–60 days was also studied, and its mechanism is considered. • Polymer of intrinsic microporosity (PIM-1) was investigated in various states. • The films tested were as cast, ethanol treated, aged, supercritical CO 2 treated and annealed in free and in strained state. • Gas permeability and positron life time parameters were used for characterization of these states of the films. • It was shown how different treatments can be used to control the location of data points above the Upper Bound 2008." @default.
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• W3109416095 date "2021-01-01" @default.
• W3109416095 modified "2023-09-24" @default.
• W3109416095 title "Effects of different treatments of films of PIM-1 on its gas permeation parameters and free volume" @default.
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• W3109416095 doi "https://doi.org/10.1016/j.polymer.2020.123271" @default.
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