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Investigation of structures of PEO-MgCl2 based solid polymer electrolytes.

Investigation of structures of PEO-MgCl2 based solid polymer electrolytes.

Authors :
Yang, Yujun
Huo, Hong
Source :
Journal of Polymer Science Part B: Polymer Physics. Aug2013, Vol. 51 Issue 15, p1162-1174. 14p.
Publication Year :
2013

Abstract

ABSTRACT The crystallinity of polyelectrolytes has long been known to affect their ionic conductivity, but the effects of water of hydration on polyelectrolyte structure are not commonly studied. Here, polymer complexes consisting of poly(ethylene oxide) (PEO) with magnesium chloride (anhydrous MgCl2, MgCl2·4H2O, and MgCl2·6H2O, respectively) have been prepared by a mixed-solvent method. Fourier transform-infrared measurements indicate each magnesium chloride salt can coordinate with PEO to form a complex. The structures of (PEO)xMgCl2·4H2O and (PEO)xMgCl2·6H2O complexes are similar, whilst the structure of (PEO)xMgCl2 complex is different to both. Wide angle X-ray diffraction studies indicate in each polymer complex system the crystallization of PEO is depressed by the interaction of magnesium cation with the ether oxygen of PEO. PEO in (PEO)xMgCl2 and (PEO)xMgCl2·4H2O are shown to be amorphous, but in (PEO)xMgCl2·6H2O it is crystalline. Polar optical microscopy images indicate in each PEO/magnesium chloride system the crystalline morphology clearly changes with the increase of magnesium salt content. The reason for the formation of the spherulites with special morphology are the strong interaction between magnesium cation and ether oxygen of PEO, and the different evaporation rates of ethanol and chloroform in mixed solvent. A better understanding of the effects of hydration on polyelectrolyte crystallinity can help in improving their use in a variety of applications. © 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym. Phys. 2013, 51, 1162-1174 [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08876266
Volume :
51
Issue :
15
Database :
Academic Search Index
Journal :
Journal of Polymer Science Part B: Polymer Physics
Publication Type :
Academic Journal
Accession number :
88263386
Full Text :
https://doi.org/10.1002/polb.23315