PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM

M A  MEHTA; P  LIGHTFOOT; P G  BRUCE

PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM

M A MEHTA, P LIGHTFOOT, P G BRUCE

Research output: Contribution to journal › Article › peer-review

Abstract

Variable-temperature powder X-ray diffraction (VTXRD) and differential scanning calorimetry (DSC) have been used to determine the poly(ethylene oxide):Ca(CF3SO3)2 phase diagram. A new crystalline complex with a stoichiometry corresponding to 6 ether oxygens/Ca2+ ion has been identified. The data show that this complex exhibits a phase transition at approximately 200-degrees-C between a low temperature, alpha and high temperature, beta, polymorph; at higher temperature the beta polymorph melts incongruently. At lower salt contents, precipitation of Ca(CF3SO3)2 from the amorphous phase upon increasing the temperature is observed, indicating a negative entropy for the dissolution of the salt in the polymer. Finally, temperature dependent conductivities are presented for a range of compositions.

Original language	English
Pages (from-to)	1338-1343
Number of pages	6
Journal	Chemistry of Materials
Volume	5
Issue number	9
Publication status	Published - Sept 1993

Keywords

POLYMER ELECTROLYTES
OXIDE)
COMPLEXES

Handle.net

Persistent link

Cite this

@article{272730de5c3b4d21b69c531ec4e31db4,

title = "PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM",

abstract = "Variable-temperature powder X-ray diffraction (VTXRD) and differential scanning calorimetry (DSC) have been used to determine the poly(ethylene oxide):Ca(CF3SO3)2 phase diagram. A new crystalline complex with a stoichiometry corresponding to 6 ether oxygens/Ca2+ ion has been identified. The data show that this complex exhibits a phase transition at approximately 200-degrees-C between a low temperature, alpha and high temperature, beta, polymorph; at higher temperature the beta polymorph melts incongruently. At lower salt contents, precipitation of Ca(CF3SO3)2 from the amorphous phase upon increasing the temperature is observed, indicating a negative entropy for the dissolution of the salt in the polymer. Finally, temperature dependent conductivities are presented for a range of compositions.",

keywords = "POLYMER ELECTROLYTES, OXIDE), COMPLEXES",

author = "MEHTA, \{M A\} and P LIGHTFOOT and BRUCE, \{P G\}",

year = "1993",

month = sep,

language = "English",

volume = "5",

pages = "1338--1343",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society (ACS)",

number = "9",

}

TY - JOUR

T1 - PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM

AU - MEHTA, M A

AU - LIGHTFOOT, P

AU - BRUCE, P G

PY - 1993/9

Y1 - 1993/9

N2 - Variable-temperature powder X-ray diffraction (VTXRD) and differential scanning calorimetry (DSC) have been used to determine the poly(ethylene oxide):Ca(CF3SO3)2 phase diagram. A new crystalline complex with a stoichiometry corresponding to 6 ether oxygens/Ca2+ ion has been identified. The data show that this complex exhibits a phase transition at approximately 200-degrees-C between a low temperature, alpha and high temperature, beta, polymorph; at higher temperature the beta polymorph melts incongruently. At lower salt contents, precipitation of Ca(CF3SO3)2 from the amorphous phase upon increasing the temperature is observed, indicating a negative entropy for the dissolution of the salt in the polymer. Finally, temperature dependent conductivities are presented for a range of compositions.

AB - Variable-temperature powder X-ray diffraction (VTXRD) and differential scanning calorimetry (DSC) have been used to determine the poly(ethylene oxide):Ca(CF3SO3)2 phase diagram. A new crystalline complex with a stoichiometry corresponding to 6 ether oxygens/Ca2+ ion has been identified. The data show that this complex exhibits a phase transition at approximately 200-degrees-C between a low temperature, alpha and high temperature, beta, polymorph; at higher temperature the beta polymorph melts incongruently. At lower salt contents, precipitation of Ca(CF3SO3)2 from the amorphous phase upon increasing the temperature is observed, indicating a negative entropy for the dissolution of the salt in the polymer. Finally, temperature dependent conductivities are presented for a range of compositions.

KW - POLYMER ELECTROLYTES

KW - OXIDE)

KW - COMPLEXES

UR - https://www.scopus.com/pages/publications/0345961599

M3 - Article

SN - 0897-4756

VL - 5

SP - 1338

EP - 1343

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 9

ER -

PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM

Abstract

Keywords

Handle.net

Other files and links

Fingerprint

Cite this