부산대학교 도서관

[Cellulose acetate (CA)-blend-multi walled carbon nano tubes (MWCNTs)] mixed matrix membranes(MMMs), [CA/polyethylene glycol (PEG)/MWCNTs] and [CA/styrene butadiene rubber (SBR)/MWCNTs]blend MMMs were prepared by solution casting method for gas separation applications usingTetrahydrofuran (THF) as solvent. Both raw-MWCNTs (R-MWCNTs) and functionalized carboxylic-MWCNTs (C-MWCNTs) were used in membrane preparation. The MWCNTs loading ratio and pressureeffects on the gas separation performance of prepared membranes were investigated for pure He, N2, CH4and CO2 gases. Results indicated that utilizing C-MWCNT instead of R-MWCNTs in membrane fabricationhas better performance and (CO2/CH4) and (CO2/N2) selectivity reached to 21.81 and 13.74 from 13.41and 9.33 at 0.65 wt% of MWCNTs loading respectively. The effects of PEG and SBR on the gas transportperformance and mechanical properties were also investigated. The highest CO2/CH4 selectivity at 2 barpressure was reached to 53.98 for [CA/PEG/C-MWCNT] and 43.91 for [CA/SBR/C-MWCNT] blend MMMsat 0.5 wt% and 2 wt% MWCNTs loading ratio respectively. Moreover, increase of feed pressure led tomembrane gas permeability and gas pair selectivity improvement for almost all prepared membranes. The mechanical properties analysis exhibited tensile modules improvement with increasing MWCNTsloading ratio and utilizing polymer blending.