Stabilization of gas transport properties of PTMSP with porous aromatic framework: Effect of annealing

• DOI: 10.1016/j.memsci.2016.06.033
• Publication Date: 2016-06-25T15:18:53Z
• Authors: A.V. Volkov; D.S. Bakhtin; L.A. Kulikov; M.V. Terenina; G.S. Golubev; G.N. Bondarenko; S.A. Legkov; G.A. Shandryuk; V.V. Volkov; V.S. Khotimskiy; A.A. Belogorlov; A.L. Maksimov; E.A. Karakhanov
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract This work was focused on the study of physical aging of PTSMP and preventing this effect via incorporation of porous aromatic frameworks (PAF-11). The dense PTMSP membranes with PAF-11 content of 0, 1, 5 and 10 wt% were stepwise annealed in air at 100 °C for up to 510 h with constant monitoring of O 2 , N 2 and CO 2 permeability (measured at 30 °C). As-cast and aged PTMSP samples were characterized by means of helium pycnometry, dynamic mechanical analysis and IR spectroscopy. Gas transport characteristics of the PTMSP sample containing 10 wt% of PAF-11 became stable upon annealing at 100°С within the short time interval (100–200 h). However, for all other samples containing 5 wt% of PAF-11 or less, gas permeability gradually decreased with time. According to the IR analysis, upon high-temperature treatment, PAF-11 nanoparticles tended to migrate from the sub-layer region into the membrane matrix bulk. According to the helium pycnometry, the introduction of PAF-11 to the PTMSP matrix provided a loosened packaging of polymer chains, and the structure became more stabilized since the porous filler served as a “physical” cross-linker.