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Influence of Poly(ethylene glycol) Segment Length on CO2 Permeation and Stability of PolyActive Membranes and Their Nanocomposites with PEG POSS

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Helmholtz-Zentrum Geesthacht, Institute of Polymer Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
Cite this: ACS Appl. Mater. Interfaces 2015, 7, 23, 12289–12298
Publication Date (Web):September 30, 2014
Copyright © 2014 American Chemical Society

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    Three grades of PolyActive block copolymers are investigated for CO2 separation from light gases. The polymers are composed of 23 wt % poly(butylene terephthalate) (PBT) and 77 wt % poly(ethylene glycol terephthalate) (PEGT) having the poly(ethylene glycol) segments of 1500, 3000, and 4000 g/mol, respectively. A commercial PEG POSS (poly(ethylene glycol) functionalized polyoctahedral oligomeric silsesquioxanes) is used as a nanofiller for these polymers to prepare nanocomposites via a solvent casting method. Single gas permeabilities of N2, H2, CH4, and CO2 are measured via the time-lag method in the temperature range from 30 to 70 °C. The thermal transitions of the prepared membranes are studied by differential scanning calorimetry (DSC). It is found that the length of PEG segment has a pronounced influence on the thermal transition of the polymers that regulates the gas separation performance of the membranes. The stability of the nanocomposites is also correlated with the thermal transition of the polyether blocks of the polymer matrices.

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    DSC curves of the three grades of PolyActive and their nanocomposites with PEG POSS (Figure S1); permeability of N2, CH4, and H2 (Table S1); CO2/N2 selectivity (Figure S2); CO2/CH4 selectivity (Figure S3); CO2/H2 selectivity (Figure S4); comparison of CO2 permeability of the presented membranes with previously published PEBAX MH 1657 membranes (Table S2); Robeson Plot 2008 for CO2/N2 gas pair (Figure S5); Robeson Plot 2008 for CO2/CH4 gas pair (Figure S6). This material is available free of charge via the Internet at

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