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Ionic conductivity in physical networks of polyethylene-polyether-polyethylene triblock copolymers

Jannasch, Patric LU (2002) In Chemistry of Materials 14(6). p.2718-2724
Abstract
A self-assembling ABA triblock copolymer complexed with lithium bis(trifluorometliylsulfonyl)imide (LiTFSI) salt showed ion conductivities (sigma) approaching 10(-5) S/cm at 20 degreesC. The block copolymer had endblocks of polyethylene (PE) and midblocks of poly(ethylene oxide-co-propylene oxide) (PEOPO) and formed physical networks with PEOPO chains interconnected by crystalline PE domains. Thermal analysis showed a PEOPO glass transition at -68 degreesC and a PE melting point at 100 degreesC. When the melting region of the PE phase was reached, sigma of the electrolytes was found to increase sharply to attain the same level as the corresponding electrolyte based on the neat PEOPO precursor block. Furthermore, the level of sigma of the... (More)
A self-assembling ABA triblock copolymer complexed with lithium bis(trifluorometliylsulfonyl)imide (LiTFSI) salt showed ion conductivities (sigma) approaching 10(-5) S/cm at 20 degreesC. The block copolymer had endblocks of polyethylene (PE) and midblocks of poly(ethylene oxide-co-propylene oxide) (PEOPO) and formed physical networks with PEOPO chains interconnected by crystalline PE domains. Thermal analysis showed a PEOPO glass transition at -68 degreesC and a PE melting point at 100 degreesC. When the melting region of the PE phase was reached, sigma of the electrolytes was found to increase sharply to attain the same level as the corresponding electrolyte based on the neat PEOPO precursor block. Furthermore, the level of sigma of the block copolymer electrolytes was found to be strongly dependent on the thermal history of the samples, and they showed a hysteresis behavior where sigma increased by a factor of approximate to3 after annealing above 110 degreesC. This may be explained by a reduction of the chain constraints of the PEOPO blocks in the physical network after annealing. The electrolytes behaved essentially like thermoplastics and were soft, tacky, self-supporting materials at room temperature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemistry of Materials
volume
14
issue
6
pages
2718 - 2724
publisher
The American Chemical Society
external identifiers
  • wos:000176365000043
  • scopus:0036084937
ISSN
0897-4756
DOI
10.1021/cm021103e
language
English
LU publication?
yes
id
4131cef9-3730-440e-b692-8ae4cb015434 (old id 150820)
date added to LUP
2007-07-13 12:25:27
date last changed
2017-01-01 04:38:57
@article{4131cef9-3730-440e-b692-8ae4cb015434,
  abstract     = {A self-assembling ABA triblock copolymer complexed with lithium bis(trifluorometliylsulfonyl)imide (LiTFSI) salt showed ion conductivities (sigma) approaching 10(-5) S/cm at 20 degreesC. The block copolymer had endblocks of polyethylene (PE) and midblocks of poly(ethylene oxide-co-propylene oxide) (PEOPO) and formed physical networks with PEOPO chains interconnected by crystalline PE domains. Thermal analysis showed a PEOPO glass transition at -68 degreesC and a PE melting point at 100 degreesC. When the melting region of the PE phase was reached, sigma of the electrolytes was found to increase sharply to attain the same level as the corresponding electrolyte based on the neat PEOPO precursor block. Furthermore, the level of sigma of the block copolymer electrolytes was found to be strongly dependent on the thermal history of the samples, and they showed a hysteresis behavior where sigma increased by a factor of approximate to3 after annealing above 110 degreesC. This may be explained by a reduction of the chain constraints of the PEOPO blocks in the physical network after annealing. The electrolytes behaved essentially like thermoplastics and were soft, tacky, self-supporting materials at room temperature.},
  author       = {Jannasch, Patric},
  issn         = {0897-4756},
  language     = {eng},
  number       = {6},
  pages        = {2718--2724},
  publisher    = {The American Chemical Society},
  series       = {Chemistry of Materials},
  title        = {Ionic conductivity in physical networks of polyethylene-polyether-polyethylene triblock copolymers},
  url          = {http://dx.doi.org/10.1021/cm021103e},
  volume       = {14},
  year         = {2002},
}