Novel polymer electrolytes based on ABA block copolymers

Gray, Fiona M.; MacCallum, J.R.; Vincent, Colin A.; Giles, Jeremy R. M.

doi:10.1021/ma00180a018

Cited by 95 publications

(81 citation statements)

References 9 publications

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“…By choosing a lithium salt-solvating polymer as one block component, continuous ion-conducting pathways can be templated. Poly(ethylene oxide) is a popular choice for the ionically conductive block when combined with a stiff, high-Tg block for dimensional stability [92]. Many alternatives for the PEO block have been suggested and are discussed in a recent review [93].…”

Section: Ordering Of Functional Block Copolymersmentioning

confidence: 99%

Patterning with block copolymer thin films

Segalman

2005

Materials Science and Engineering: R: Reports

933

921

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The nanometer-scale architectures in thin films of self-assembling block copolymers have inspired a variety of new applications. For example, the uniformly sized and shaped nanodomains formed in the films have been used for nanolithography, nanoparticle synthesis, and high-density information storage media. Imperative to all of these applications, however, is a high degree of control over orientation of the nanodomains relative to the surface of the film as well as control over order in the plane of the film. Induced fields including electric, shear, and surface fields have been demonstrated to influence orientation. Both heteroepitaxy and graphoepitaxy can induce positional order on the nanodomains in the plane of the film. This article will briefly review a variety of mechanisms for gaining control over block copolymer order as well as many of the applications of these materials. Particular attention is paid to the potential of perfecting long-range two-dimensional order over a broader range of length scales and the extension of these concepts to functional materials and more complex architectures. #

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Section: Ordering Of Functional Block Copolymersmentioning

confidence: 99%

Patterning with block copolymer thin films

Segalman

2005

Materials Science and Engineering: R: Reports

933

921

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“…Also, self-assembly is used where amorphous ethylene oxide-containing domains are incorporated within block copolymeric structures, leading to synergistic properties [225,[241][242][243]. There were early efforts to combine PEO within block copolymer structures, for example by grafting short PEO grafts to the middle block of polystyrene-bpolybutadiene-b-polystyrene triblock copolymer [244,245]. Upon solvating CF 3 SO 3 Li to the PEO, conductivity in the order of 10 -5 S cm -1 at ambient temperature was obtained and self-assembly and suppressed PEO crystallization were observed.…”

Section: Self-assembled Ionically Conducting Polymersmentioning

confidence: 99%

Transport and Electro‐Optical Properties in Polymeric Self‐Assembled Systems

Ikkala¹,

Brinke²

2007

Macromolecular Engineering

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“…The real and imaginary parts of the complex impedance were plotted, and the ionic conductivity (a) could be obtained from the bulk resistance (Rb) found in complex impedance diagram. 7 …”

Section: Conductivity Measurementmentioning

confidence: 99%

“…The solid state 7 Li NMR experiments were performed on a Bruker-MSL-200 NMR spectrometer with a magnetic field of 4. 7 T corresponding to a 7 Li resonance frequency of 77.…”

Section: Nmrmentioning

confidence: 99%

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Ionic Conductivity and 7Li NMR Study of Solid Polymer Electrolytes Based on Polyetherurethane Copolymer Networks

Kim

Park

Rhee

et al. 1994

Polym J

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ABSTRACT:Crosslinked polyetherurethane (PEU) copolymer networks consisting of the low molecular weight poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) segments with an aliphatic diisocyanate were synthesized and complexed with a LiC1O4 salt to form solid polymer electrolytes. The ionic conductivities of these samples were measured as a function of PEO composition at various temperatures. And a solid 7 Li NMR relaxation technique was used as a means of understanding the local environments and dynamics of the lithium ions in the polymer electrolytes. The difference in spin-spin relaxation times (T2) between two spectral components enabled to their separation, and thus we could monitor the mobile Li+ ion concentration and its motion as a function of PEO composition and temperature.KEY WORDS Copolymer Network / Ionic Conductivity / 7 Li NMR Relaxation / Polyetherurethane / Poly(ethylene oxide) / Polymer Electrolyte/ Poly(propylene oxide)/ Polymer electrolytes have been received a considerable attention as solid electrolyte materials in the advanced applications such as high energy-density batteries, electrochromic devices, chemical sensors and photoelectrochemical cells. 1 • 2 The great deal of studies to date have been carried out on polymer electrolytes based on poly(ethylene oxide) (PEO) containing the lithium salts. However, their high crystallinity decreases the ionic conductivity to a level too low to satisfy the requirement of room temperature applications, since conductivity in semi-crystalline polymer electrolytes is mainly achieved through the amorphous phase in complexes. 3 .4 Various attempts have been made to prepare the solid polymer electrolytes with the improved ionic conductivities and dimensional stability at ambient temperature. 5 -20 Among them, the synthesis of crosslinked polyether-urethane was found to provide a means to inhibit the crystallization and to improve the mechanical strength. The most prominently reported networks were those arising from the reaction of polyfunctional isocyanates with homopolyols poly(ethylene glycol) (PEG) only 12 -15 ,i 9 , 2 o or poly(propylene glycol) (PPG) only 12 , 14 , 16 -1 s_ It is conceivable that the controlled compositional changes in the polyether segments composed of both PEO and poly(propylene oxide) (PPO) affect the carrier generation and migration in polymer electrolytes prepared with them.In this study, we prepared the polyether-1 To whom correspondence should be addressed. 993

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Novel polymer electrolytes based on ABA block copolymers

Cited by 95 publications

References 9 publications

Patterning with block copolymer thin films

Patterning with block copolymer thin films

Transport and Electro‐Optical Properties in Polymeric Self‐Assembled Systems

Ionic Conductivity and 7Li NMR Study of Solid Polymer Electrolytes Based on Polyetherurethane Copolymer Networks

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