Effect of Added Salt on Disordered Poly(ethylene oxide)-Block-Poly(methyl methacrylate) Copolymer Electrolytes
| Autor: | Saheli Chakraborty, Neel Shah, Michael D. Galluzzo, Krzysztof Matyjaszewski, Whitney S. Loo, Sajjad Dadashi-Silab, Nitash P. Balsara |
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| Rok vydání: | 2021 |
| Předmět: |
Molar mass
Polymers and Plastics Ethylene oxide Chemistry Small-angle X-ray scattering Organic Chemistry Analytical chemistry Ionic bonding 02 engineering and technology Flory–Huggins solution theory 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Poly(methyl methacrylate) 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound visual_art Materials Chemistry Copolymer visual_art.visual_art_medium Methyl methacrylate 0210 nano-technology |
| Zdroj: | Macromolecules. 54:1414-1424 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | 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%. |
| Databáze: | OpenAIRE |
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