Di-ureasil hybrids doped with LiBF4: Spectroscopic study of the ionic interactions and hydrogen bonding
In the present work Fourier transform infrared and Raman spectroscopy were used to characterize the cation/polymer, cation/cross-link, cation/anion and hydrogen bonding interactions in hybrid electrolytes composed of lithium tetrafluoroborate (LiBF4) and di-urea cross-linked poly(oxyethylene) (POE)/...
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| Veröffentlicht in: | Materials chemistry and physics 2011-09, Vol.129 (1-2), p.385-393 |
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| creator | Fernandes, Mariana Barbosa, Paula C. Manuela Silva, M. Smith, Michael J. de Zea Bermudez, Verónica |
| description | In the present work Fourier transform infrared and Raman spectroscopy were used to characterize the cation/polymer, cation/cross-link, cation/anion and hydrogen bonding interactions in hybrid electrolytes composed of lithium tetrafluoroborate (LiBF4) and di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks (di-ureasils) designated as d-U(2000) and d-U(600) and incorporating polyether chains with ca. 40.5 and 8.5 oxyethylene repeat units, respectively. Samples with a> n greater than or equal to 2.5 (where n, composition, is the molar ratio of CH2CH2O units per Li+ ion) were analyzed. In both di-ureasil systems over the whole range of salt content examined the Li+ ions bond to the ether oxygen atoms of amorphous POE chains and to BF4 - ions forming ion contact pairs. Spectroscopic evidences and SEM images confirm the presence of a crystalline POE/LiBF4 complex of unknown stoichiometry at n |
| doi_str_mv | 10.1016/j.matchemphys.2011.04.030 |
| format | Article |
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Ionic association is particularly important in the case of the d-U(600)-based materials, as a result of the presence of strong hydrogen-bonded aggregates that prevent the establishment of Li+/urea carbonyl oxygen atom interactions.</description><identifier>ISSN: 0254-0584</identifier><identifier>DOI: 10.1016/j.matchemphys.2011.04.030</identifier><language>eng</language><subject>Bonding ; Cationic polymerization ; Crosslinking ; Ethers ; Hydrogen bonding ; Oxygen atoms ; Spectroscopy</subject><ispartof>Materials chemistry and physics, 2011-09, Vol.129 (1-2), p.385-393</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c369t-1d648fca6352e1ae1433fddd3b406ce18c617c9a2246e284d309fc8144241e373</citedby><cites>FETCH-LOGICAL-c369t-1d648fca6352e1ae1433fddd3b406ce18c617c9a2246e284d309fc8144241e373</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Fernandes, Mariana</creatorcontrib><creatorcontrib>Barbosa, Paula C.</creatorcontrib><creatorcontrib>Manuela Silva, M.</creatorcontrib><creatorcontrib>Smith, Michael J.</creatorcontrib><creatorcontrib>de Zea Bermudez, Verónica</creatorcontrib><title>Di-ureasil hybrids doped with LiBF4: Spectroscopic study of the ionic interactions and hydrogen bonding</title><title>Materials chemistry and physics</title><description>In the present work Fourier transform infrared and Raman spectroscopy were used to characterize the cation/polymer, cation/cross-link, cation/anion and hydrogen bonding interactions in hybrid electrolytes composed of lithium tetrafluoroborate (LiBF4) and di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks (di-ureasils) designated as d-U(2000) and d-U(600) and incorporating polyether chains with ca. 40.5 and 8.5 oxyethylene repeat units, respectively. Samples with a> n greater than or equal to 2.5 (where n, composition, is the molar ratio of CH2CH2O units per Li+ ion) were analyzed. In both di-ureasil systems over the whole range of salt content examined the Li+ ions bond to the ether oxygen atoms of amorphous POE chains and to BF4 - ions forming ion contact pairs. Spectroscopic evidences and SEM images confirm the presence of a crystalline POE/LiBF4 complex of unknown stoichiometry at n <20 and 25, respectively. 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| source | Elsevier ScienceDirect Journals |
| subjects | Bonding Cationic polymerization Crosslinking Ethers Hydrogen bonding Oxygen atoms Spectroscopy |
| title | Di-ureasil hybrids doped with LiBF4: Spectroscopic study of the ionic interactions and hydrogen bonding |
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