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Thermal Rearrangement of Acetate-functionalized Polyimides and Adsorption Properties for CO2 |
Yunhua LU1( ),Guoyong XIAO1,Lin LI2,Yan DONG1,Haijun CHI1,Zhizhi HU1,Tonghua WANG2( ) |
1. School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China 2. State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China |
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Cite this article:
Yunhua LU,Guoyong XIAO,Lin LI,Yan DONG,Haijun CHI,Zhizhi HU,Tonghua WANG. Thermal Rearrangement of Acetate-functionalized Polyimides and Adsorption Properties for CO2. Chinese Journal of Materials Research, 2019, 33(3): 209-217.
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Abstract Two kinds of diamines containing ortho-hydroxyl groups and bulky moiety, 3,3'-diamino-4,4'-dihydroxytetraphenylmethane (DDTPM) and 9,9-bis (3-amino-4-hydroxyphenyl) fluorene (BAHPF) were polymerized respectively with aromatic dianhydride 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) via a low-temperature solution polymerization, and next, two acetate-functionalized polyimides (PI) were prepared via chemical imidization, and thirdly, which were further thermally treated at 425oC in N2 atmosphere to obtain the thermally rearranged polymers. Then, the structure and property of the PIs and TR polymers were characterized by means of Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), X-ray photoelectric spectroscopy (XPS), X-ray diffraction(XRD) and gas adsorption isotherms etc. The results show that the thermal rearrangement (TR) occured partially for both of the PI(DDTPM-6FDA) and PI(BAHPF-6FDA), and the PI containing two phenyl groups show a range of thermal rearrangement temperature broader than the PI containing fluorene moieties. They show high glass transitionn temperatures (Tg) and larger interplanar crystal spacing. After the thermal treatment at 425oC, the specific surface area of TR(DDTPM-6FDA) and TR(BAHPF-6FDA) are 198 and 582 m2/g, and their pore diameters are 0.42 and 0.44 nm, respectively. They are belong to microporous materials, and the adsorption capacity for CO2 of TR(BAHPF-6FDA) is higher than that of TR(DDTPM-6FDA).
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Received: 18 April 2018
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Fund: Supported by National Natural Science Foundation of China(21878033);Supported by National Natural Science Foundation of China(21506020);Supported by National Natural Science Foundation of China(21406102);Supported by National Natural Science Foundation of China(21676044);Natural Science Foundation of Liaoning Province(20180550439);Program for Liaoning Excellent Talents in University(LJQ2015053) |
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