Synthesis and gas transport properties of novel poly(ether ether ketone)s containing fluorene group

Two novel gas separation membranes (Phenyl(Ph)-poly(ether ether ketone)s (PEEKs) and PEEKs) based on PEEKs with a high fractional free volume were designed and synthesized. The structure and thermodynamic stability of the membranes were investigated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The two membranes, which were determined to be high-molecular weight polymers by gel permeation chromatography, showed good solubility in a weakly polar solvent. The gas transport properties of the Ph-PEEK membranes were investigated for different gases (CO2, O2, CH4, and N2) at 25°C and 1 atm. The Ph-PEEK-3 membrane with the largest free volume had the largest gas permeability coefficient and maintained good selectivity. The effect of operating temperature on the gas permeation of the Ph-PEEK-3 membrane was also investigated, and the maximum permeability of the four single gases was reached at 55°C and 1 atm.

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Pure and mixed gas transport properties of novel asymmetric poly(ether ether ketone) membranes with different morphologies

Desalination ◽

10.1016/j.desal.2006.03.105 ◽

2006 ◽

Vol 199 (1-3) ◽

pp. 461-463 ◽

Cited By ~ 3

Author(s):

Johannes C. Jansen ◽

Marialuigia Macchione ◽

Roy Raharjo ◽

Benny D. Freeman ◽

Enrico Drioli

Keyword(s):

Transport Properties ◽

Gas Transport ◽

Mixed Gas ◽

Gas Transport Properties ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Ether Ketone

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Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

Polymer Composites ◽

10.1002/pc.24455 ◽

2017 ◽

Vol 39 (S3) ◽

pp. E1544-E1553 ◽

Cited By ~ 2

Author(s):

Corneliu Hamciuc ◽

Elena Hamciuc ◽

Daniela Rusu ◽

Mihai Asandulesa ◽

Aleksandra Wolinska-Grabczyk

Keyword(s):

Transport Properties ◽

Gas Transport ◽

Hybrid Films ◽

Gas Transport Properties ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Ether Ketone ◽

Silica Hybrid

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Aromatic polyamides and copolyamides containing fluorene group

High Performance Polymers ◽

10.1177/0954008317732121 ◽

2017 ◽

Vol 30 (7) ◽

pp. 821-832 ◽

Cited By ~ 14

Author(s):

Tengyang Zhu ◽

Xing Yang ◽

Xiaoqi He ◽

Yayun Zheng ◽

Jujie Luo

Keyword(s):

Transport Properties ◽

Chemical Structure ◽

Gas Transport ◽

Gas Permeability ◽

Operating Temperature ◽

Gas Permeation ◽

Proton Nuclear Magnetic Resonance ◽

Fractional Free Volume ◽

Aromatic Polyamides ◽

Gas Transport Properties

A series of new aromatic polyamides (PAs) and copolyamides (CPAs) containing fluorene group have been synthesized through polycondensation reaction. The chemical structure was confirmed by Fourier transform infrared and proton nuclear magnetic resonance (1H NMR). PAs and CPAs exhibited the higher thermal stability ( Td15 > 378°C in nitrogen), the higher glass transition temperature ( Tg > 345°C), and excellent solubility in polar solvent. Gas transport properties of the PA and CPA membranes were investigated using different single gases (hydrogen (H2), carbon dioxide (CO2), oxygen (O2), methane (CH4), and nitrogen (N2)). We discussed the effect of chemical structure and operating temperature on gas transport properties. The results show that PA-1 containing a hexafluoroisopropylidene moiety exhibited the highest gas permeability ( PH2 = 12.71 Barrer, PCO2 = 12.26 Barrer, and PO2 = 2.62 Barrer) and reasonably good selectivity ( α(H2/N2) = 27.63, α(CO2/N2) = 26.65, and α(O2/N2) = 5.70) at 25°C and 1 atm. For all the membranes, gas permeability gradually increased with the increase in operating temperature, while the selectivity gradually decreased. These gas permeation results were well correlated with fractional free volume, interchain d-spacing ( dsp), and intermolecular interaction.

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