Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (6): 634-640.DOI: 10.6023/A15010082 Previous Articles     Next Articles

Special Issue: 共价有机多孔聚合物

Article

四苯基乙烯基共轭微孔聚合物的制备及其气体吸附

赵洋, 王笑颜, 张崇, 蒋加兴   

  1. 陕西师范大学材料科学与工程学院 西安 710062
  • 收稿日期:2015-01-30 出版日期:2015-06-14 发布日期:2015-04-06
  • 通讯作者: 蒋加兴 E-mail:jiaxing@snnu.edu.cn
  • 基金资助:

    项目受到国家自然科学(青年)基金(No. 21304055)和中央高校基本科研业务费专项基金(No. GK201501002)的支持.

Conjugated Microporous Polymers Based on Tetraphenylethylene for Gas Adsorption

Zhao Yang, Wang Xiaoyan, Zhang Chong, Jiang Jia-Xing   

  1. School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710062
  • Received:2015-01-30 Online:2015-06-14 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.

Key words: conjugated microporous polymer, tetraphenylethylene, Sonogashira-Hagihara reaction, gas adsorption