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Influence of intramolecular interactions on carbon dioxide gas adsorption capacity in Mesoporous Imine polymers

preprint
submitted on 26.01.2018 and posted on 26.01.2018 by Jaya Prakash Madda, Pilli Govindaiah, Sushant Kumar Jena, Sabbhavat Krishna, Rupak Kishor

Covalent organic Imine polymers with intrinsic meso-porosity were synthesized by condensation reaction between 4,4-diamino diphenyl methane and (para/meta/ortho)-phthaladehyde. Even though these polymers were synthesized from precursors of bis-bis covalent link mode, the bulk materials were micrometer size particles with intrinsic mesoporous enables nitrogen as well as carbon dioxide adsorption in the void spaces. These polymers were showed stability up to 260o centigrade. Nitrogen gas adsorption capacity up to 250 cc/g in the ambient pressure was observed with type III adsorption characteristic nature. Carbon dioxide adsorption experiments reveal the possible terminal amine functional group to carbamate with CO2 gas molecule to the polymers. One of the imine polymers, COP-3 showed more carbon dioxide sorption capacity and isosteric heat of adsorption (Qst) than COP-1 and COP-2 at 273 K even though COP-3 had lower porosity for nitrogen gas than COP-1 and COP-2. We explained the trends in gas adsorption capacities and Qst values as a consequence of the intra molecular interactions confirmed by Density Functional Theory computational experiments on small molecular fragments.

Funding

ECR/2015/000237

History

Topic

  • Physical and Chemical Properties

Email Address of Submitting Author

maddaj@nitrkl.ac.in

Institution

National Institute of Technology, Rourkela, Odisha.

Country

India

ORCID For Submitting Author

0000-0001-5334-725X

Declaration of Conflict of Interest

No Conflict of Interest.

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