Effect of Added Salt on Disordered Poly(ethylene oxide)-Block-Poly(methyl methacrylate) Copolymer Electrolytes
In: Macromolecules, Jg. 54 (2021-02-09), Heft 3
Online
academicJournal
- 1414 - 1424
We studied the effect of salt addition on a diblock copolymer system with a negative Flory-Huggins interaction parameter, χ, indicative of attractive interactions between the two blocks. The system studied is poly(ethylene oxide)-block-poly(methyl methacrylate) (PEO-PMMA) with added lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. We studied two asymmetric block copolymers, PEO-PMMA(10-33) and PEO-PMMA(10-64), where the numbers refer to the molar masses of the blocks in kg mol-1. The small-angle X-ray scattering (SAXS) profiles for PEO-PMMA(10-33) were featureless at all salt concentrations. In contrast, PEO-PMMA(10-64) exhibited SAXS peaks when the salt concentration was between 0.22 ≤ m (mol Li/kg polymer) ≤ 0.44. The appearance of SAXS peaks only in PEO-PMMA(10-64) is consistent with the predictions of ionic self-consistent field theory developed by de la Cruz and co-workers, which predicts that in systems with negative χ, ordered phases are only found when the volume fraction of the ionic block is about 10%.
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Effect of Added Salt on Disordered Poly(ethylene oxide)-Block-Poly(methyl methacrylate) Copolymer Electrolytes
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Autor/in / Beteiligte Person: | Shah, Neel J ; Dadashi-Silab, Sajjad ; Galluzzo, Michael D ; Chakraborty, Saheli ; Loo, Whitney S ; Matyjaszewski, Krzysztof ; Balsara, Nitash P |
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Zeitschrift: | Macromolecules, Jg. 54 (2021-02-09), Heft 3 |
Veröffentlichung: | eScholarship, University of California, 2021 |
Medientyp: | academicJournal |
Umfang: | 1414 - 1424 |
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