A facile synthesis of contorted spirobisindane-diamine and its microporous polyimides for gas separation

Abstract

Contorted diamine monomers are the attractive precursors for the synthesis of novel microporous polyimides with high gas separation performance.

Pentiptycene-Based Polyurethane with Enhanced Mechanical Properties and CO2-Plasticization Resistance for Thin Film Gas Separation Membranes

“…The creation of free volume is generally obtained by the disruption of chain packing in the polymer structure. Molecular modeling analysis and experimental studies suggest that adding bulky side groups or highly contorted structures effectively disrupt the chain packing and result in higher gas permeability. , Recently, new microporous polyimides with iptycene units have been designed to achieve fast and selective gas transport. , The polyimides with paddlelike triptycene moiety exhibit improved gas permeability compared to the traditional polyimides (e.g., Matrimid) . The enhancement is greater for pentiptycene-based polyimides with nearly 50% higher CO 2 permeability than that of the triptycene-based polyimide membrane .…”

“…Molecular modeling analysis and experimental studies suggest that adding bulky side groups or highly contorted structures effectively disrupt the chain packing and result in higher gas permeability. 5,6 Recently, new microporous polyimides with iptycene units have been designed to achieve fast and selective gas transport. 7,8 The polyimides with paddlelike triptycene moiety exhibit improved gas permeability compared to the traditional polyimides (e.g., Matrimid).…”

A Bird’s-Eye View on Polymer-Based Hydrogen Carriers for Mobile Applications

“…As membranes, PIMs are built of highly inflexible and twisted molecular frameworks which contain an abundant number of interconnected micropores (pore size < 2 nm) and ultra-micropores (pore size < 0.7 nm) [ 69 ]. A number of well-known classes of amorphous polymers provide intrinsic microporosity, as demonstrated by gas permeability (e.g., polyacetylenes [ 71 ], fluorinated polymers [ 72 ], polynorbornene [ 73 ], and polyimides [ 74 ]). These properties are being exploited in the field of polymer membranes, where they are described as "ultra-permeable" polymers [ 69 ].…”

Phthalide-containing poly(ether-imide)s based thermal rearrangement membranes for gas separation application

“…As a result, the gas separation properties of PI membrane materials have been dramatically improved by these efforts. [21][22][23][24][25][26][27][28] In recent years, thermal rearrangement (TR) polymers have been developed and investigated by researchers in the eld of membrane separation. [29][30][31][32][33][34] Due to the transition from imide ring to benzoxazole structure, hydroxyl-containing polyimide (HPI) is transformed into polybenzoxazole (PBO), and a large amount of small molecule gas CO 2 is released.…”