Porous silica nanosheets in PIM-1 membranes for CO2 separation

High Gas Permeability in Aged Superglassy Membranes with Nanosized UiO‐66−NH2/cPIM‐1 Network Fillers

“…[6] Regarding the second strategy, fillers that have high sieving effects and/or CO 2 philicity can improve the selectivity of PIM membranes as well. Yet, it is worth noting that common porous fillers, such as hypercrosslinked polystyrene (HCP) [7] and silica nanosheets (SN) [8] do not show good interaction with the polymer, and thus are not very effective in impeding aging. In addition, the inclusion of fillers that have low compatibility with the polymer is prone to introducing interfacial defects, which decrease the selectivity of membranes, especially for thin membranes.…”

“…In addition, the inclusion of fillers that have low compatibility with the polymer is prone to introducing interfacial defects, which decrease the selectivity of membranes, especially for thin membranes. It has been reported that functionalized fillers, such as sulfonated (S−)SN, [8] carbonized (C−)HCP, [7] functionalized metal–organic frameworks (MOFs, such as UiO‐66−NH 2 ), [9] and porous aromatic framework (PAF), [10] can interact with the PIM‐1 chains to reduce chain relaxation, and thus aging [7–8] . In particular, PAF allows partial intrusion of polymer segments into its pores and effectively inhibits the aging in thick film PIM‐1 membranes (thickness >100 μm), [10] but poorly performed in TFCs for preventing the aging [11] .…”

Thin film nanocomposite membranes of superglassy PIM-1 and amine-functionalised 2D fillers for gas separation

“…However, most studies focus on freestanding thick MMMs, and only a few report the preparation of TFNs. In a recent publication by our research group, 43 thin lm nanocomposites (TFNs) membranes were prepared by incorporating porous silica nanosheets (SN) functionalized by a sulfonic acid (S-SN) in the PIM-1 polymer matrix. The incorporation of 0.05 wt% of S-SN led to 35% higher initial CO 2 permeance (3771 AE 5 GPU) than the TFC PIM-1 (2778 AE 1010 GPU), and enhanced physical aging was obtained.…”

Outstanding performance of PIM-1 membranes towards the separation of fluorinated refrigerant gases

“…On the other hand, glassy polymers with high free volume such as the polymers of intrinsic microporosity (PIMs) have gained importance over the last two decades as membrane materials for gas separation applications [14][15][16]. Budd et al [17] reported on the structure of PIM-1 polymer, which they subsequently used as membrane matrices for pervaporation [18] and gas separation [19].…”