@article{2959241,
    title = "Effect of Molecular Weight on the Mechanical and Electrical Properties of Block Copolymer Electrolytes",
    author = "Mohit Singh and Omolola Odusanya and Gregg M. Wilmes and Hany B. Eitouni and Enrique D. Gomez and Amish J. Patel and Vincent L. Chen and Moon Jeong Park and Panagiota Fragouli and Hermis Iatrou and Nikos Hadjichristidis and David Cookson and Nitash P. Balsara",
    journal = "Macromolecules",
    year = "2007",
    volume = "40",
    number = "13",
    pages = "4578--4585",
    publisher = "American Chemical Society (ACS)",
    issn = "0024-9297, 1520-5835",
    doi = "10.1021/ma0629541",
    keywords = "Lamellar grains;  Polystyrene-Wocfc-poly(ethylene oxide) copolymers;  Theological properties, Doping (additives);  Ionic conductivity;  Mechanical properties;  Molecular weight;  Morphology;  Polyethylene oxides, Polyelectrolytes",
    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. © 2007 American Chemical Society."
}