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Solid state NMR study of intercalate complexes of poly(ethylene oxide) and small molecules
Author(s) -
Spěváček Jiří,
Brus Jiří
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200351309
Subject(s) - ethylene oxide , chemistry , hexamethylbenzene , polymer , amorphous solid , oxide , alkoxy group , chemical shift , proton nmr , nmr spectra database , proton , solid state nuclear magnetic resonance , benzene , polymer chemistry , crystallography , spectral line , nuclear magnetic resonance , alkyl , organic chemistry , copolymer , physics , astronomy , quantum mechanics
From solid state NMR spectra, a lower shielding of poly(ethylene oxide) (PEO) protons, in contrast to higher shielding of PEO carbons, has been found for PEO/hydroxybenzene and PEO/LiCF 3 SO 3 complexes in comparison with neat PEO. The same PEO chemical shifts were found both for crystalline and amorphous phase of PEO/LiCF 3 SO 3 polymer electrolyte, confirming the same interaction in both phases. Measurements of 2D 1 H CRAMPS exchange NMR spectra have been used to characterize proton distances in complexes of PEO and benzene derivatives. A close contact (∼ 0.3 nm) between aromatic and PEO protons was detected in some cases. From the measurements of the cross polarization 1 H → 13 C, using Lee‐Goldburg irradiation of 1 H nuclei, the distance between LiCF 3 SO 3 carbon and the nearest PEO protons in the PEO/LiCF 3 SO 3 complex was determined.