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The structure of poly(ethylene oxide)‐salt complexes with 13 c CPMAS NMR and relaxation studies
Author(s) -
Maunu Sirkka L.,
Soljamo Kari,
Laanterä Matti,
Sundholm Franciska
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950229
Subject(s) - ethylene oxide , polymer , magic angle spinning , chemistry , magic angle , oxide , relaxation (psychology) , polymer chemistry , carbon 13 nmr , spin–lattice relaxation , analytical chemistry (journal) , proton , nuclear magnetic resonance spectroscopy , copolymer , stereochemistry , organic chemistry , solid state , psychology , social psychology , physics , quantum mechanics
13 C cross polarization and magic‐angle spinning (CPMAS) NMR studies were made on poly(ethylene oxide) (PEO) complexed wit LiClO 4 , NaClO 4 , BaSCN, Bal 2 and Ba(ClO 4 ) 2 . The proton and carbon spin‐lattice relaxation times in a rotating frame ( T 1ρH , T 1ρC ) as well as the rate of cross polarization were measured at room temperature. For Ba(ClO 4 ) 2 the measurements were made with different polymer molar masses and salt concentrations. The changes in relaxation behaviour indicate changes in polymer chain mobility as well as strong interaction between ions and PEO chains. The T 1ρH and T 1ρC decrease with decreasing salt concentration towards the relaxation times of the pure polymer. Nonexponential relaxation behaviour was found for the samples according to the T 1ρC and T CH measurements.