Characterization of crosslinked hollow fiber membranes

Crosslinked polybenzimidazole membranes for organic solvent nanofiltration (OSN): Analysis of crosslinking reaction mechanism and effects of reaction parameters

“…A positive effect of temperature (factor A) on both responses is expected as increasing the temperature generally leads to higher crosslinking degrees [40,41].…”

Plasticization and Swelling in Polymeric Membranes in CO2 Removal from Natural Gas

“…It enhances the separation properties of the membrane for natural gas separation [111,112] and increases the pressure at which plasticization occurs. It makes membranes more stable at the higher partial pressure of CO 2 .…”

Thin-skinned intrinsically defect-free asymmetric mono-esterified hollow fiber precursors for crosslinkable polyimide gas separation membranes

“…This suggests that th skin layer and most productive hollow fibers. Therefore, reformulated so that the defect-free skin layer thickness can be reduced to the desired consistent with the correct binodal shown in Fig. By setting the dope composition closer to the and rapid phase separation is possible viscosity closer to thick honey when heated up to the spinning temperature nature of polymer solutions and multiple requirements that must be met require considerable trial and error in dope development to described in detail in following sections 14 Ternary phase diagram depicting the binodal (blue line) of PDMC polymer/solvent/non solvent system and dope composition in Section 4.1 (point a) and reformulated dope composition previous section, spinning condition optimizations enabled creation of defect free hollow fibers. However, the hollow fibers showed some evidence for substructure resistance thin skin layer (~0.1 µm) using the same dope composition in suggests that the dope composition may be not optimal to make the thinnest skin layer and most productive hollow fibers.…”

“…Reducing the skin layer thickness to improve permeance is challenging, due to greater tendency for skin defects with low selectivity, for such membranes with thin selective layers. Although post-treatment with silicon rubber can cure small skin defects for less aggressive feeds, it tends to cause instability under aggressive feeds at high pressures and with high concentrations of CO 2 [14]. This fact motivates the development of thin-skinned intrinsically defect-free hollow fiber membranes for challenging gas separations.…”