Gas separation performance and mechanical properties of thermally-rearranged polybenzoxazoles derived from an intrinsically microporous dihydroxyl-functionalized triptycene diamine-based polyimide

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

“…In comparison, the fabrication of nonwoven membrane supports from bamboo fiber reinforced poly(lactic acid) composites resulted in increased mechanical stability from 32.7 to 73.3 MPa while the elongation at break remained virtually the same [24]. In the meantime, TRIP-TR-460-30 PBO membrane recently fabricated displayed good mechanical properties with tensile strength, and elongation at break of 58 MPa and 4.3%, respectively [25]. Similarly, three PI-TBs membranes fabricated for gas separation application Membranes 2020, 10, 32 8 of 18 had tensile strengths in the range of 52.9-114.2 MPa, and elongation at break of 8.9%-10.8% [26].…”

Recent progress in microporous polymers from thermally rearranged polymers and polymers of intrinsic microporosity for membrane gas separation: Pushing performance limits and revisiting trade‐off lines

“…For instance, shapepersistent and inherently microporous iptycene units have been employed to effectively disrupt chain packing during TR conversion. [82][83][84][85][86] In TR chemistry, triptycene units are mainly explored to tailor microporosity as well as gas transport properties. Studies on triptycene-derived F I G U R E 2 Molecular simulation of dihedral angle distributions for bridged-bicyclic and spiro-based sites of contortion.…”

“…For instance, shape‐persistent and inherently microporous iptycene units have been employed to effectively disrupt chain packing during TR conversion. [ 82–86 ] In TR chemistry, triptycene units are mainly explored to tailor microporosity as well as gas transport properties. Studies on triptycene‐derived TR polymers have been investigated precursors as of both HPIs [ 13 ] and PHAs, [ 60 ] and all these showed dramatic enhancement in gas transport characteristics.…”

Hydrocarbon separations by glassy polymer membranes

“…Thermally rearranged (TR) polybenzoxazoles (PBOs) are synthesized by high-temperature (e.g., 350-450 C) solidstate decarboxylation reaction of poly(hydroxyimide) precursors containing ortho-positioned hydroxyl groups ( Figure 11). [36,[114][115][116][117][118][119][120] Thermal rearrangement evolves polymer chain conformation and topology giving wellconnected FVEs with narrow size distribution attractive for molecular separations. [115] Poly(hydroxyimide) precursors are solution processable, thus insoluble TR PBOs can be derived into thin films and hollow fibers.…”

“…[152] Ideal C 3 H 6 /C 3 H 8 selectivity $30 was seen in selected glassy polymers under mild feed conditions (ambient temperature and <2 bar feed pressure). [118,153,154] However, very few have reported C 3 H 6 /C 3 H 8 mixture permeation data under or close to the aforementioned realistic feed condition. [98] Burns and Koros gave a comprehensive review of C 3 H 6 /C 3 H 8 separation in aromatic polyimides.…”