Citation: YAO Chan, LI Guo-Yan, XU Yan-Hong. Carboxyl-Enriched Conjugated Microporous Polymers: Impact of Building Blocks on Porosity and Gas Adsorption[J]. Acta Physico-Chimica Sinica, ;2017, 33(9): 1898-1904. doi: 10.3866/PKU.WHXB201705112 shu

Carboxyl-Enriched Conjugated Microporous Polymers: Impact of Building Blocks on Porosity and Gas Adsorption

YAO Chan ^1, ,
LI Guo-Yan ¹ ,
XU Yan-Hong ^1,2

1.
Key Laboratory of Preparation and Applications of Environmental Friendly Materials of Ministry of Education, Jilin Normal University, Changchun 130103, P. R. China;
2.
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin Province, P. R. China

Received Date: 6 April 2017
Revised Date: 3 May 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21501065), Science and Technology Program of Jilin Province, China (20160101319JC), Science and Technology Research Program of the Education Department of Jilin Province (No. 2015229), and Science and Technology Program of Siping City (No. 2015057).

Polar groups in the skeletons of conjugated microporous polymers (CMPs) play an important role in determining their porosity and gas sorption performance. Understanding the effect of the polar group on the properties of CMPs is essential for further advances in this field. To address this fundamental issue, we used benzene, the simplest aromatic system, as a monomer for the construction of two novel CMPs with multi-carboxylic acid groups in their skeletons (CMP-COOH@1 and CMP-COOH@2). We then explored the profound effect the amount of free carboxylic acid in each polymer had on their porosity, isosteric heat, gas adsorption, and gas selectivity. CMP-COOH@1 and CMP-COOH@2 showed Brunauer-Emmett-Teller (BET) surface areas of 835 and 765 m²·g^-¹, respectively, displaying high potential for carbon dioxide storage applications. CMP-COOH@1 and CMP-COOH@2 exhibited CO₂ capture capabilities of 2.17 and 2.63 mmol·g^-¹ (at 273 K and 1.05 × 10⁵ Pa), respectively, which were higher than those of their counterpart polymers, CMP-1 and CMP-2, which showed CO₂ capture capabilities of 1.66 and 2.28 mmol·g^-¹, respectively. Our results revealed that increasing the number of carboxylic acid groups in polymers could improve their adsorption capacity and selectivity.
- Conjugated Microporous Polymers,
- Carboxylic Acid,
- Pore,
- Gas Adsorption,
- Selectivity
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