Pebax®1657/Graphene oxide composite membranes for improved water vapor separation

Abstract

In this study composite mixed matrix membranes containing hydrophilic microphaseseparated block copolymer (Pebax ® 1657) and graphene oxide nanosheets were prepared using a dip coating method. Water vapor and N 2 gas permeation were measured as a function of different parameters: (i) layer thickness, (ii) content of graphene oxide (GO), and (iii) content of reduced GO. Surprisingly, a concentration of only 2 wt% of GO nanosheets well dispersed in the Pebax layer boosted the selectivity 8 times by decreasing the water vapor permeance by only 12 % whereas N 2 gas permeance decreased by 70 %. Using reduced GO instead, the water vapor permeance declined by up to 16% with no influence on the N 2 gas permeance. We correlated the permeation properties of the mixed matrix membranes with different models and found, that both the modified Nielsen model and the Cussler model give good correlation with experimental findings.

Preparation of antibacterial and antifungal breathable polyether block amide/chloropropane diol membranes via solution casting

“…Even after addition of CPD, morphology of membrane does not change to too much extent (Figure ). CPD is entrapped through hydrogen bonding between OH group in CPD and polar NH, CO groups present in PEBA (as explained in FTIR and DSC) . There is no significant defect or crack in the prepared membranes.…”

Thin supported MOF based mixed matrix membranes of Pebax® 1657 for biogas upgrade

“…Although the Pebax ® 1657 Raman spectrum shows weak signals owing to its fluorescence, three peaks can be distinguished at 1133, 1305 and 1454 cm -1 related to the C-O and C=O vibration modes. 38 Signals in the 1300-1800 cm -1 range can be seen in the P84 ® spectrum. The signals at 1376 and 1435 cm -1 correspond to the C=O in-phase stretching mode.…”

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

“…8 Assuming the perfluorinated polymer layers in the composite membranes have the same CO 2 and CH 4 permeabilities as pure membranes of the polymers (Table 3), then the respective average permeabilities of the 6FDA-TMPDA and PIM-1 layers can be determined through Equation (3), and are provided in Table 6. This assumption is valid because of the poor solvation properties of the Teflon AF1600 polymer, meaning it does not integrate, blend or be modified by the underlying 6FDA-TMPDA or PIM-1 layer structure.…”

“…Previous research has demonstrated that exposure to water vapor can reduce the permselectivity of the polyimide 6FDA-TMPDA by 50% [6] and for high performance PIM-1 membranes by 38% [7]. The majority of the research has focused on water removal from the feed stream, in dehydration applications [8][9][10][11][12][13][14]. In contrast, perfluorinated polymers Teflon AF1600 and Hyflon AD60 membranes demonstrate significant resistance to separation performance loss in the presence of water vapor [15].…”