Simple Method to Enhance O₂/N₂ Separation on P84 co-polyimide Hollow Fiber Membrane

Abstract

In this study, a simple coating technique to enhance the selectivity performance of P84 co-polyimide hollow fiber polymer membrane was investigated. The hollow fiber membrane was coated with polydimethylsiloxane (PDMS) to prevent gas flow through the defect surface. The prepared membranes were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and pure gas permeation measurement. The pure gas of O2 and N2 were used to determine the permeation properties of the hollow fiber membrane. The single gas measurement showed that the perm-selectivity of O2/N2 of the hollow fiber membrane increased up to 181% after the coating treatment. It is concluded that the simple coating technique has significant effect in enhancing the selectivity performance of the hollow fiber membrane.

P84/ZCC Hollow Fiber Mixed Matrix Membrane with PDMS Coating to Enhance Air Separation Performance

“…The first was the evaporation of excess water at 100 °C causing around 5 wt% mass loss in each membrane, while the second was the starting decomposition of P84 co-polyimide that was different in each sample. The pristine membrane started to decompose at a temperature of 531.33 °C, which is consistent with the previously reported data [ 34 , 35 , 43 ]. This indicated the high thermal stability of P84 co-polyimide.…”

“…More detailed methods on ZCC synthesis were described elsewhere [ 29 ]. The hollow fiber membrane was fabricated via dry/wet spinning method with the parameters inspired from Favvas et al [ 34 , 35 ] and Choi et al [ 34 , 35 ] with some adjustments. The P84 co-polyimide and ZCC were dehydrated at 80 °C for 24 h to remove the moisture in advance of membrane preparation.…”

The utilization of micro-mesoporous carbon-based filler in the P84 hollow fibre membrane for gas separation

“…Then the actual result of the membrane performance was obtained. It is already known that employing low concentration of PDMS could aid the minor defect formation on the membrane surface and result in actual gas separation properties of polymer [5,60]. For CO 2 separation, the neat membrane exhibits CO 2 , N 2 and CH 4 permeability of 4.68, 0.22 and 0.21 barrer, respectively.…”

“…PDMS is a rubbery material with low selectivity and high permeability that is composed of high flexibility of silane group [62]. Our previous result observed that PDMS has very good compatibility with P84 by forming uniform layer on the membrane surface [5].…”

“…The most popular rubbery polymers are ethylene oxide [1,2] and amide copolymer [3]. As well, polyimides [4][5][6], polysulfone [7,8] and polyamide imide [9] are the most referred glassy polymers. Polyimide-based polymers are some of the most used polymers for preparing gas separation membrane.…”