Unprecedented Sour Mixed-Gas Permeation Properties of Fluorinated Polyazole-Based Membranes

Abstract

A polyoxadiazole polymer POz-CF 3 was prepared, and complete gas permeation properties were investigated on its corresponding membrane using pure-, and multicomponent mixed-gas feeds. The POz-CF 3 membrane demonstrated attractive pureand sweet mixed-gas permeation properties; however, the performance of its membrane declined dramatically during sour mixed-gas testing. The modification of POz-CF 3 into its corresponding polytriazole polymers led to changes in their membranes' mechanical, thermal, processability, and gas permeation properties. For example, the membrane formation of FPT-Ph(NMe 2 ) polytriazole could not be possible due to the polymer low solubility in most solvents. In contrast, the polytriazole FPT-Ph(OH) afforded membranes with improved mechanical properties and enhanced pure-and mixed-gas permeation properties compared to POz-CF 3 membrane. The sour mixed-gas results, in particular, are very attractive and superior to most of the aromatic polymeric membranes tested with similar conditions of gas feed (20 vol % H 2 S) and operational pressure and temperature.

Gas permeation and microstructure of reduced graphene oxide/polyethyleneimine multilayer films createdviarecast and layer-by-layer deposition processes

“…[71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] Moreover, the size, solubility, and weight of the gas molecules also have a signicant inuence on their permeation. [44][45][46] Thus, gas permeation in polymer is a very complex phenomenon, and there is rarely a simple linear relation between the gas permeability and a given parameter. [44][45][46]90 We found that there is no linear relation between the free volumes and the gas permeability for the PEI/RGO composite lms.…”

“…[44][45][46] Thus, gas permeation in polymer is a very complex phenomenon, and there is rarely a simple linear relation between the gas permeability and a given parameter. [44][45][46]90 We found that there is no linear relation between the free volumes and the gas permeability for the PEI/RGO composite lms. Nevertheless, the PALS results strongly suggest that the decrease in free volume size has made a signicant contribution to the excellent gas barrier property of the PEI/RGO composite lms.…”

“…[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] For a composite polymer lm, the microstructure and interactions among components can be extremely complex, [40][41][42][43] as well as the dynamics of gas permeation within it. [44][45][46] Previous studies have mainly focused on the performance of these lms. [47][48][49][50][51] Further study into the important question of how the performance of barrier lms is inuenced by their microstructure and free volumes is needed.…”

Functional Polymer Materials in Environmental Biosensors in the Context of the Internet of Things

“…Functional polymers are new materials that emerged after polymer materials entered the fields of biology, energy, and electronics. The so-called "functional" means that such polymers have chemical reactivity, electrical conductivity, catalysis, biocompatibility, selective separation, energy conversion and magnetic properties in addition to their mechanical properties [10][11]. Functional polymers are widely used in medicine, environmental protection and other fields due to their advantages of light weight, high strength, corrosion resistance, diverse varieties, abundant raw materials, and simple molecular structure [12][13].…”

“All Polyimide” Mixed Matrix Membranes for High Performance Gas Separation

“…Several classes of polymers have been used for gas separation. Among them, polyimides (PIs) based on 4,4 -(hexafluoroisopropylidene) diphthalic anhydride (6FDA) are emerging for various applications and are the most common used polymeric membranes due to their thermal stability, self-standing, acid resistance, and CO 2 affinity [3][4][5][6]. However, PIs with higher selectivity generally have lower permeability and vice versa [7], which was first proposed by Robeson [8] and named as "trade-off" relationship [9].…”