Evolution of ultra-thin dense-selective layer from single-layer to dual-layer hollow fibers using novel Extem® polyetherimide for gas separation

Peng, Na; Chung, Tai‐Shung; Chng, Mei Lin; Aw, Weiqiang

doi:10.1016/j.memsci.2010.04.046

Cited by 72 publications

(32 citation statements)

References 34 publications

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“…Two main types of polyimides for matrices are considered which are synthesized and actively explored in the Institute of Macromolecular Compounds of the Russian Academy of Sciences: 11,13,[15][16][17][18][19]58,59 crystallisable R-BAPB based on 1,3-bis-(3',4-dicarboxyphenoxy)-benzene (dianhydride R) and 4,4' bis-(4''-aminophenoxy)-diphenyl (diamine BAPB) and amorphous R-BAPS based on dianhidride R and 4,4'-bis-(4''-aminophenoxy)-diphenylsulfone (diamine BAPS), whose chemical structures are given in Fig. [66][67][68][69][70] Similar to the case of R-BAPB and R-BAPS polyimides, the major difference in their chemical structure (shown in Fig. These polyimides have identical dianhydride fragments in repeating units and differ in the diamine fragment composition.…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

Influence of the carbon nanotube surface modification on the microstructure of thermoplastic binders

et al. 2015

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The structural properties of polymer nanocomposites based on thermoplastic polyimides filled with the surface-modified carbon nanotubes (CNT) have been studied by means of the fully-atomistic molecular-dynamics simulations. The influence of a distibution of functional carboxyl groups over the CNT surface on the polymer-matrix density distribution, and the orientational ordering of polymer chains have been investigated. It was shown that the polymer shifts far away from the nanoparticle surface with increase of the CNT modification degree. The orientational ordering of PI chains was not observed in the case of nanocomposites filled with modified CNTs where carboxyl groups are distributed uniformly on the surface. However, in case of the edge-modified CNTs the polymer can interact with CNT surface; such edge-modified nanoparticle induces orientational ordering of crystallisable polyimide chains that can be considered as an initial stage of the polymer-matrix crystallization.

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Section: Model and Simulation Methodsmentioning

confidence: 99%

Influence of the carbon nanotube surface modification on the microstructure of thermoplastic binders

et al. 2015

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“…Eight to ten fibers with an average length of 16 cm were potted into one flat metallic hollow holder and glued by a regular epoxy resin with their ends open. The other end of the fibers was sealed by a using quick curing epoxy as shown in Figure c . The pressure‐normalized fluxes of the modules were tested in the order of N 2 , O 2 , CH 4 , and CO 2 at ambient temperature with a transmembrane pressure of 300 kPa (3 bar).…”

Section: Methodsmentioning

confidence: 99%

Formation of defect‐free polyetherimide/PIM‐1 hollow fiber membranes for gas separation

2014

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Dual‐layer hollow fiber membranes were produced from blends of Ultem and polymer of intrinsic microporosity (PIM‐1) with enhanced gas permeance. The effects of spinning parameters (take‐up speed and air gap distance) on gas separation performance were investigated based on the pristine Ultem. Selected spinning conditions were further adopted for the blend system, achieving defect‐free and almost defect‐free hollow fibers. Adding PIM results in a higher fractional free volume, 50% increments in gas permeance were observed for Ultem/PIM‐1 (95/5) and more than 100% increments for Ultem/PIM‐1 (85/15). Both O2/N2 and CO2/CH4 selectivities remained the same for Ultem/PIM‐1 (95/5) and above 80% of their respective intrinsic values for Ultem/PIM‐1 (85/15). The selective layer thickness ranges from 70 to 120 nm, indicating the successful formation of ultrathin dense layers. Moreover, minimum amounts of the expensive material were consumed, that is, 0.88, 1.7, and 2.3 wt % PIM‐1 for Ultem/PIM‐1 (95/5), (90/10), and (85/15), respectively. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3848–3858, 2014

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“…(13) was obtained that shows the effect of temperature on the PEI solution viscosity. ln m T 0:5 ¼ pðXÞ þ 1000 qðXÞ T (13) In which p(X) and q(X) are functions of the polymer mass fraction.…”

Section: The Influence Of Temperature On the Solutions Viscositymentioning

confidence: 99%

Role of critical concentration of PEI in NMP solutions on gas permeation characteristics of PEI gas separation membranes

Shamsabadi

Kargari

Bahrami

et al. 2013

Journal of Industrial and Engineering Chemistry

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Evolution of ultra-thin dense-selective layer from single-layer to dual-layer hollow fibers using novel Extem® polyetherimide for gas separation

Cited by 72 publications

References 34 publications

Influence of the carbon nanotube surface modification on the microstructure of thermoplastic binders

Influence of the carbon nanotube surface modification on the microstructure of thermoplastic binders

Formation of defect‐free polyetherimide/PIM‐1 hollow fiber membranes for gas separation

Role of critical concentration of PEI in NMP solutions on gas permeation characteristics of PEI gas separation membranes

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