Capture and release of CO2 by polyamidine. Issue 16 (16th May 2013)

• Record Type: Journal Article
• Authors: Furusho, Yoshio; Endo, Takeshi
• Is Part Of: Journal of polymer science. Volume 51:Issue 16(2013:Aug.)
• Page Start: 3404
• Page End: 3411
• Publication Date: 2013-05-16
• Subjects: 547
• DOI: 10.1002/pola.26737
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>By CO₂ bubbling into an aqueous dimethyl sulfoxide solution, the polyamidine (<bold>Poly‐Amd</bold>) prepared from hexamethylenediamine and triethyl orthoacetate was converted to the bicarbonate salt, <bold>Poly‐Amd</bold>H·HCO₃, which formed aggregates. Conversely, the aggregates disappeared upon Ar bubbling to release the captured CO₂, reverting to <bold>Poly‐Amd</bold> completely. Polyethyleneimine (<bold>PEI</bold>) also reversibly captured and released CO₂ molecules in solution by bubbling CO₂ and Ar, respectively, in an alternate manner. No appreciable difference was observed between <bold>Poly‐Amd</bold> and <bold>PEI</bold> in CO₂ capture in solution. The binary system consisting of <bold>Poly‐Amd</bold> and polyethylene glycol (<bold>PEG</bold>) captured CO₂ efficiently at ordinary pressure and reached a stationary state within 200 h, at which 66% of the amidine groups bound CO₂ molecules, which was released upon exposure to a N₂ flow. In contrast to the binary system with <bold>Poly‐Amd, </bold> the binary system of <bold>PEI</bold> with <bold>PEG</bold> did not capture CO₂ efficiently, and only 5.7% of the amino groups bound CO₂ molecules after 600 h. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <bold>2013</bold>, <italic>51</italic>, 3404–3411</p> </abstract>