CO2 adsorption on PIMs studied with 13C NMR spectroscopy
| Autor: | Mark S. Conradi, Sophia E. Hayes, Robert M. Marti, Naiying Du, Michael D. Guiver, Jeremy K. Moore |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Nitrile 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Co2 adsorption 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy 13c nmr spectroscopy chemistry Group (periodic table) Polymer chemistry Tetrazole Physical and Theoretical Chemistry 0210 nano-technology |
| Popis: | Polymers of intrinsic microporosity (PIMs) can be functionalized with nitrogen-bearing groups, such as a nitrile group for PIM-1 and a methylated tetrazole group for MTZ-PIM, to physisorb CO2. Static 13C NMR spectroscopy was used to investigate CO2 dynamics by analysis of onedimensional spectra and T2 relaxation times at temperatures ranging from 6 to 295 K. Each polymer had two different loadings of CO2 to determine the dominating relaxation mechanism at lower temperatures and deduce the identity of the weaker secondary adsorption site on the rigid polymer backbone. Both polymers, with a high loading of CO2, experience a narrowing of the 13C NMR line width as the samples are warmed to 80 K, which is the onset of the weakly adsorbed CO2 hopping on and off the polymer backbone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|