Conformational, thermal, and ionic conductivity behavior of PEO in PEO/PMMA miscible blend: Investigating the effect of lithium salt

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Mahdi Ghelichi - , University of Tehran (Autor:in)
  • Nader Taheri Qazvini - , University of Tehran (Autor:in)
  • Seyed Hassan Jafari - , University of Tehran (Autor:in)
  • Hossein Ali Khonakdar - , Iran Polymer and Petrochemical Institute (Autor:in)
  • Yaser Farajollahi - , University of Tehran (Autor:in)
  • Christina Scheffler - , Leibniz-Institut für Polymerforschung Dresden (Autor:in)

Abstract

In this research, influence of incorporating LiClO4 salt on the crystallization, conformation, and ionic conductivity of poly(ethylene oxide) (PEO) in its miscible blend with poly(methyl methacrylate) (PMMA) is studied. Differential scanning calorimetry showed that the incorporation of salt ions into the blend suppresses the crystallinity of PEO. The X-ray diffraction revealed that the unit-cell parameters of the crystals are independent of the LiClO4 concentration despite of the existence of ionic interactions between PEO and Li cations. In addition, the complexation of the Li+ ions by oxygen atoms of PEO is investigated via Fourier transform infrared spectroscopy. The conformational changes of PEO segments in the presence of salt ions are studied via Raman spectroscopy. It is found that PEO chains in the blend possess a crown-ether like conformation because of their particular complexation with the Li+ ions. This coordination of PEO with lithium cations amorphize the PEO and is accounted for suppressed crystallinity of PEO in the presence of salt ions. Finally, electrochemical impedance spectroscopy is used to characterize the ionic conductivity of PEO in the PEO/PMMA/LiClO 4 ternary mixture at various temperatures.

Details

OriginalspracheEnglisch
Seiten (von - bis)1868-1874
Seitenumfang7
FachzeitschriftJournal of applied polymer science
Jahrgang129
Ausgabenummer4
PublikationsstatusVeröffentlicht - 15 Aug. 2013
Peer-Review-StatusJa
Extern publiziertJa

Schlagworte

Schlagwörter

  • batteries and fuel cells, blends, structure-property relations