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Solid‐state 13 C, 15 N and 29 Si NMR characterization of block copolymers with CO 2 capture properties
Author(s) -
Shah Faiz Ullah,
Akhtar Farid,
Khan Muhammad Saif Ullah,
Akhter Zareen,
Antzutkin Oleg N.
Publication year - 2016
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4440
Subject(s) - chemistry , copolymer , characterization (materials science) , block (permutation group theory) , nuclear magnetic resonance spectroscopy , solid state , crystallography , stereochemistry , nanotechnology , polymer , organic chemistry , materials science , geometry , mathematics
Natural abundance solid‐state multinuclear ( 13 C, 15 N and 29 Si) cross‐polarization magic‐angle‐spinning NMR was used to study structures of three block copolymers based on polyamide and dimethylsiloxane and two polyamides, one of which including ferrocene in its structure. Assignment of most of the resonance lines in 13 C, 15 N and 29 Si cross‐polarization magic‐angle‐spinning NMR spectra were suggested. A comparative analysis of 13 C isotropic chemical shifts of polyamides with and without ferrocene has revealed a systematic shift towards higher δ ‐values (de‐shielding) explained as the incorporation of paramagnetic ferrocene into the polyamide backbone. In addition, the 13 C NMR resonance lines for ferrocene‐based polyamide were significantly broadened, because of paramagnetic effects from ferrocene incorporated in the structure of this polyamide polymer. Single resonance lines with chemical shifts ranging from 88.1 to 91.5 ppm were observed for 15 N sites in all of studied polyamide samples. 29 Si chemical shifts were found to be around −22.4 ppm in polydimethylsiloxane samples that falls in the range of chemical shifts for alkylsiloxane compounds. The CO 2 capture performance of polyamide‐dimethylsiloxane‐based block copolymers was measured as a function of temperature and pressure. The data revealed that these polymeric materials have potential to uptake CO 2 (up to 9.6 cm 3 g −1 ) at ambient pressures and in the temperature interval 30–40 °C. Copyright © 2016 John Wiley & Sons, Ltd.