Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes

Mohit Singh; Omolola Odusanya; Gregg M. Wilmes; Hany B. Eitouni; Enrique D. Gomez; Amish J. Patel; Vincent L. Chen; Moon Jeong Park; Panagiota Fragouli; Hermis Iatrou; Nikos Hadjichristidis; David Cookson; Nitash P. Balsara

doi:10.1021/ma0629541

Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes

Mohit Singh
, Omolola Odusanya
, Gregg M. Wilmes
, Hany B. Eitouni
, Enrique D. Gomez
, Amish J. Patel
, Vincent L. Chen
, Moon Jeong Park
, Panagiota Fragouli
, Hermis Iatrou
, Nikos Hadjichristidis
, David Cookson
, Nitash P. Balsara

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

483 Scopus citations

Abstract

The relationship between ionic conductivity, morphology, and Rheological properties of polystyrene-Wocfc-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO₂CF₃)₂], is elucidated. We focus on lamellar samples with poly(ethylene oxide) (PEO) volume fractions, φ, ranging from 0.38 to 0.55, and PEO block molecular weights, M _PEO, ranging from 16 to 98 kg/mol. The low-frequency storage modulus (G′) at 90 °C increases with increasing M_PEO from about 4 × 10⁵ to 5 × 10⁷ Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 σ, also increases with increasing M_PEO, from 6.2 × 10^-5 to 3.6 × 10^-4 S/cm at 90 °C. We compare σ with the conductivity of pure PEO/salt mixtures, σ_PEO. and find that σ/[(φσ_PEO] of our highest molecular weight sample is close to 0.67, the theoretical upper limit for transport through randomly oriented lamellar grains.

Original language	English (US)
Pages (from-to)	4578-4585
Number of pages	8
Journal	Macromolecules
Volume	40
Issue number	13
DOIs	https://doi.org/10.1021/ma0629541
State	Published - Jun 26 2007

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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@article{7fa17fa244f44e1bbf13f66a255fc8f9,

title = "Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes",

abstract = "The relationship between ionic conductivity, morphology, and Rheological properties of polystyrene-Wocfc-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO2CF3)2], is elucidated. We focus on lamellar samples with poly(ethylene oxide) (PEO) volume fractions, φ, ranging from 0.38 to 0.55, and PEO block molecular weights, M PEO, ranging from 16 to 98 kg/mol. The low-frequency storage modulus (G′) at 90 °C increases with increasing MPEO from about 4 × 105 to 5 × 107 Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 σ, also increases with increasing MPEO, from 6.2 × 10-5 to 3.6 × 10-4 S/cm at 90 °C. We compare σ with the conductivity of pure PEO/salt mixtures, σPEO. and find that σ/[(φσPEO] of our highest molecular weight sample is close to 0.67, the theoretical upper limit for transport through randomly oriented lamellar grains.",

author = "Mohit Singh and Omolola Odusanya and Wilmes, \{Gregg M.\} and Eitouni, \{Hany B.\} and Gomez, \{Enrique D.\} and Patel, \{Amish J.\} and Chen, \{Vincent L.\} and Park, \{Moon Jeong\} and Panagiota Fragouli and Hermis Iatrou and Nikos Hadjichristidis and David Cookson and Balsara, \{Nitash P.\}",

year = "2007",

month = jun,

day = "26",

doi = "10.1021/ma0629541",

language = "English (US)",

volume = "40",

pages = "4578--4585",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes

AU - Singh, Mohit

AU - Odusanya, Omolola

AU - Wilmes, Gregg M.

AU - Eitouni, Hany B.

AU - Gomez, Enrique D.

AU - Patel, Amish J.

AU - Chen, Vincent L.

AU - Park, Moon Jeong

AU - Fragouli, Panagiota

AU - Iatrou, Hermis

AU - Hadjichristidis, Nikos

AU - Cookson, David

AU - Balsara, Nitash P.

PY - 2007/6/26

Y1 - 2007/6/26

N2 - The relationship between ionic conductivity, morphology, and Rheological properties of polystyrene-Wocfc-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO2CF3)2], is elucidated. We focus on lamellar samples with poly(ethylene oxide) (PEO) volume fractions, φ, ranging from 0.38 to 0.55, and PEO block molecular weights, M PEO, ranging from 16 to 98 kg/mol. The low-frequency storage modulus (G′) at 90 °C increases with increasing MPEO from about 4 × 105 to 5 × 107 Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 σ, also increases with increasing MPEO, from 6.2 × 10-5 to 3.6 × 10-4 S/cm at 90 °C. We compare σ with the conductivity of pure PEO/salt mixtures, σPEO. and find that σ/[(φσPEO] of our highest molecular weight sample is close to 0.67, the theoretical upper limit for transport through randomly oriented lamellar grains.

AB - The relationship between ionic conductivity, morphology, and Rheological properties of polystyrene-Wocfc-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO2CF3)2], is elucidated. We focus on lamellar samples with poly(ethylene oxide) (PEO) volume fractions, φ, ranging from 0.38 to 0.55, and PEO block molecular weights, M PEO, ranging from 16 to 98 kg/mol. The low-frequency storage modulus (G′) at 90 °C increases with increasing MPEO from about 4 × 105 to 5 × 107 Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 σ, also increases with increasing MPEO, from 6.2 × 10-5 to 3.6 × 10-4 S/cm at 90 °C. We compare σ with the conductivity of pure PEO/salt mixtures, σPEO. and find that σ/[(φσPEO] of our highest molecular weight sample is close to 0.67, the theoretical upper limit for transport through randomly oriented lamellar grains.

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U2 - 10.1021/ma0629541

DO - 10.1021/ma0629541

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SN - 0024-9297

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EP - 4585

JO - Macromolecules

JF - Macromolecules

IS - 13

ER -

Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes

Abstract

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