Poly(ethylene oxide)/lithium triflate phase diagram

Citation
Jf. Moulin et al., Poly(ethylene oxide)/lithium triflate phase diagram, POLYMER, 40(21), 1999, pp. 5843-5850
Citations number
11
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
00323861 → ACNP
Volume
40
Issue
21
Year of publication
1999
Pages
5843 - 5850
Database
ISI
SICI code
0032-3861(199910)40:21<5843:POTPD>2.0.ZU;2-W
Abstract
The complete phase diagram of the poly(ethylene oxide)/lithium trifluoromet hane sulfonate polymer electrolyte was determined by combined X-ray diffrac tion and differential scanning calorimetry. The sample preparation has dram atic effects on morphology and consequently on the phase diagram. The exist ence of three different molecular adducts involving the polymer and the sal t was deduced from the phase diagram. These adducts transform into each oth er by peritectic reactions. Moreover, two different forms of pure lithium t rifluoromethane sulfonate were observed. This polymorphism was studied by X -ray diffraction and differential scanning calorimetry. It was demonstrated that this salt undergoes a transition to a phase of higher symmetry at 179 degrees C. An orthorhombic unit cell (a = 1.496 nm, b = 1.475 nm, c = 1.42 5 nm) was proposed for the high temperature form of the salt. (C) 1999 Else vier Science Ltd. All rights reserved.