Conjugated Microporous Polymers Based on Tetraphenylethylene for Gas Adsorption
Received date: 2015-01-30
Online published: 2015-04-06
Supported by
Project supported by the National Natural Science Foundation of China (No. 21304055) and the Fundamental Research Funds for the Central Universities (No. GK201501002).
Conjugated microporous polymers (CMPs) are attracting increasing attention due to their potential applications in areas such as gas adsorption, separation, heterogeneous catalysis and photoelectron. A series of CMPs based on tetraphenylethylene has been synthesized via Pd-catalyzed Sonogashira-Hagihara coupling reaction. During polymerization, all of the polymer networks precipitated from solution as yellow powders that are totally insoluble in common organic solvents tested because of their highly crosslinked structures. Thermogravimetric analysis indicated that all of the polymer networks are thermally stable up to 400 ℃ in nitrogen atmosphere. The high physicochemical and thermal stability could be attributed to the rigid nature of these aromatic polymers, composed solely of strong carbon-carbon and carbon-hydrogen bonds. The absence of the C≡H stretching peaked at around 3280 cm-1 and the C—Br stretching peaked at around 500 cm-1 in the FT-IR spectra for the polymer networks demonstrated that most of the ethynyl and bromine functional groups in the starting materials have been consumed by coupling reaction. Powder X-ray diffraction measurements revealed that all of the polymer networks are amorphous in nature. It was found that the homo-coupled polymer network of TPE-CMP1 from 1,1,2,2-tetrakis(4-ethynylphenyl)ethene shows the highest Brunauer-Emmet-Teller specific surface area up to 1096 m2·g-1 among the resulting polymer networks. TPE-CMP1 exhibits a CO2 uptake ability of 2.36 mmol·g-1 at 1.13 bar and 273 K with a H2 uptake capacity of 1.35 wt% at 1.13 bar and 77.3 K. All of the polymer networks show high CO2/N2 selectivity around 30:1 and high isosteric heat of adsorption for CO2 up to 27.6 kJ·mol-1. Given the facile preparation strategy, the high physicochemical and thermal stability, the high surface area, and the outstanding CO2 sorption performances, these polymer networks are promising candidates for potential applications in post-combustion CO2 capture and sequestration technology.
Zhao Yang , Wang Xiaoyan , Zhang Chong , Jiang Jia-Xing . Conjugated Microporous Polymers Based on Tetraphenylethylene for Gas Adsorption[J]. Acta Chimica Sinica, 2015 , 73(6) : 634 -640 . DOI: 10.6023/A15010082
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