Pyrolysis of polyimide membranes from the same dianhydride monomer and different diamines to form carbon membranes

LI Lin; QI Wen-bo; WANG Hong; ZHANG Ping-ping; SUN Mei-yue; WANG Tong-hua; LI Jian-xin; CAO Yi-ming

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Article Navigation > New Carbon Mater. > 2015 > 30(5): 459-465

LI Lin, QI Wen-bo, WANG Hong, ZHANG Ping-ping, SUN Mei-yue, WANG Tong-hua, LI Jian-xin, CAO Yi-ming. Pyrolysis of polyimide membranes from the same dianhydride monomer and different diamines to form carbon membranes. New Carbon Mater., 2015, 30(5): 459-465.

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Pyrolysis of polyimide membranes from the same dianhydride monomer and different diamines to form carbon membranes

1.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China;
2.
Hollow Fiber Membrane Materials and Membrane Process Laboratory as the State Key Lab Incubation Base in China, Tianjin Polytechnic University, Tianjin 300023, China;
3.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116001, China

Funds: National Natural Science Foundation of China(20976021,21176036);National High Technology Research and Development(Z2012AA03A611);China Postdoctora/Science Foundation(2014M561232);Fundamental Re-search Funds for the Central Universities(DUT14RC(3)119).

Received Date: 2015-06-20
Accepted Date: 2015-11-10
Rev Recd Date: 2015-10-09
Publish Date: 2015-10-28

Abstract

Abstract

Polyimide membranes were synthesized by the polymerization of five diamines, p-phenylenediamine (PPD), 2,3,5,6-tetramethyl-1,4-phenylenediamine (TMPPD), 4,4'-oxydianiline (ODA), 4,4'-(4,4'-isopropylidenediphenyl-1,1'-diyldioxy)dianiline (BAPP) and 4,4'-(hexafluoroisopropylidene)bis(p-phenyleneoxy) dianiline (BDAF), and the same dianhydride monomer, 1,2,4,5-benzenetetracarboxylic anhydride (PMDA). The chemical structures of the membranes pyrolyzed at different temperatures were investigated by TGA, TG-MS, FT-IR and XPS. Results indicate that there are five stages during pyrolysis: (a) the removal of the solvents, adsorbed oxygen and water, (b) imidization, (c) cross-linking and carbonization, which are accompanied by main chain breaking, (d) deoxygenation and dehydrogenation, (e) aromatization and turbostratic carbon formation. The chemical structure of the precursor is the main factor that causes the great differences in chemical structures during pyrolysis. Imidization in the pyrolysis of the PPD-PMDA and TMPPD-PMDA occurs at higher temperatures than those for ODA-PMDA, BDAF-PMDA and BAPP-PMDA. The order of temperatures for the release of CH₄, CO₂ and C₆H₆ during the pyrolysis is ODA-PMDA >BDAF-PMDA >BAPP-PMDA. Elemental F in the BDAF-PMDA disappears after pyrolysis at 700℃. The chemical structures of the polyimides have a great influence on the microstructures of the carbon membranes obtained.
- Polyimide,
- Carbon membrane,
- Chemical structure,
- Pyrolysis mechanism

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References(17)

References

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