Investigation of induced plasticization in novel MCM-41/Polyethersulfone (PES) mixed matrix membranes
Paper ID : 1410-MST2015-FULL
Milad Laghaei *1, Morteza Sadeghi2, Mahdi Shahrooz3
1Isfahan University of Technology, Isfahan
3Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
Mixed matrix membranes (MMMs) composed of polyethersulfone (PES) and spherical MCM-41 mesoporous silica particles were fabricated by the solution-casting method. The prepared membranes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to determine their crystallinity and morphology, respectively. Moreover, performance of the MMMs in the separation of CO2/CH4 was studied using the constant volume-variable pressure method. The results indicated that the permeability of CO2 and CH4 increased from 1.40 and 0.05 Barrer for neat PES membrane to 3.56 and 0.13 Barrer for MMMs containing 20 wt% MCM-41, respectively. This increment was attributed to a simultaneous increase in solubility and diffusion coefficient. While by incorporation of the MCM-41 into the PES matrix a tremendous increase in the gas permeability has been observed, the CO2/CH4 selectivity decreased, especially at higher loadings. It was due to the poor compatibility between the rigid polymer matrix and the MCM-41 fillers. To investigate the possible plasticization phenomenon, which deteriorates the gas separation performance, the effect of feed pressure on gas permeability and selectivity of CO2/CH4 was studied at the constant temperature of 25 °C and 2-8 bar feed pressure range. The results illustrated that the induced plasticization did not occur in neat PES as well as the MMMs. Therefore, adding the unmodified MCM-41 particles into the PES matrix could not induce plasticization.
Polyethersulfone, MCM-41, Mixed matrix membrane, Plasticization
Status : Paper Accepted (Poster Presentation)