Journal
MACROMOLECULES
Volume 42, Issue 15, Pages 5642-5651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma900401a
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Funding
- U.S. Department of Energy FreedomCAR
- Vehicle Technologies Program
- National Science Foundation Graduate Research Fellowship
- Director, Office of Science
- Office of Basic Energy Sciences
- U.S. Department of Energy [DE-AC0205CHI 1231]
- National Science Foundation/Department of Energy [CHE-0535644]
- Officc of Basic Energy Sciences [DEAC02-06CH 11357]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0822838] Funding Source: National Science Foundation
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Order-order and order-disorder phase transitions in Mixtures of poly(styrene-block-ethylene oxide) (SEO) copolymers and lithium bis(trifluoromethysulfonimide) (LiTFSI), a common lithium Salt. used in polymer electrolytes, were studied using a combination of small-angle X-ray scattering (SAXS), birefringence, and ac impedance spectroscopy. The SEO/LiTFSI mixtures exhibit lamellar, hexagonally packed cylinders, and gyroid microphases. The molecular weight of the blocks and the salt concentration was adjusted to obtain order-order and order-disorder transition temperatures within the available experimental window. The ionic conductivities of the mixtures. normalized by the ionic conductivity of a 20 kg/mol homopolymer PEO sample at the salt concentration and temperature of interest, were independent of temperature, in spite of the presence of the above-mentioned phase transitions,
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