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ANSTO Publications Online >
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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/1085
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| Title: | Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes. |
| Authors: | Singh, M Odusanya, O Wilmes, GM Eitouni, HB Gomez, ED Patel, AJ Chen, VL Park, MJ Fragouli, P Latrou, H Hadjichristidis, N Cookson, DJ Balsara, NP |
| Keywords: | Lithium Grain Boundaries Electrolytes Copolymers Self-Diffusion Ionic Conductivity Solid State Physics |
| Issue Date: | 26-Jun-2007 |
| Publisher: | American Chemical Society |
| Citation: | Singh, M., Odusanya, O., Wilmes, G. M., Eitouni, H. B., Gomez, E. D., Patel, A. J., et al. (2007). Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes. Macromolecules, 40(13), 4578-4585. |
| Abstract: | The relationship between ionic conductivity, morphology, and rheological properties of polystyrene-block-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, phi, 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 degrees C increases with increasing M-PEO from about 4 x 10(5) to 5 x 10(7) Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 sigma, also increases with increasing M-PEO, from 6.2 x 10(-5) to 3.6 x 10(-4) S/cm at 90 degrees C. We compare sigma with the conductivity of pure PEO/salt mixtures, sigma(PEO), and find that sigma/[phi sigma(PEO)] 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 |
| URI: | http://dx.doi.org/10.1021/ma0629541 http://apo.ansto.gov.au/dspace/handle/10238/1085 |
| ISSN: | 0024-9297 |
| Appears in Collections: | Journal Articles |
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