Molecular probe technique for determining local thermal transitions: The glass transition at Silica/PMMA nanocomposite interfaces

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dc.contributor.author Parker, Katelyn
dc.contributor.author Schneider, Ryan T.
dc.contributor.author Siegel, Richard W.
dc.contributor.author Ozisik, Rahmi
dc.contributor.author Cabanelas Valcárcel, Juan Carlos
dc.contributor.author Serrano Prieto, Berna
dc.contributor.author Antonelli, Claire
dc.contributor.author Baselga Llidó, Juan
dc.date.accessioned 2017-11-22T12:12:00Z
dc.date.available 2017-11-22T12:12:00Z
dc.date.issued 2010-10-01
dc.identifier.bibliographicCitation Parker, K., Schneider, R. T., Siegel, R. W., Ozisik, R., Cabanelas, J. C., Serrano, B., Antonelli, C. & Baselga, J. (2010). Molecular probe technique for determining local thermal transitions: The glass transition at Silica/PMMA nanocomposite interfaces. Polymer, 51 (21), pp. 4891-4898.
dc.identifier.issn 0032-3861
dc.identifier.uri http://hdl.handle.net/10016/25931
dc.description.abstract Local glass transition temperatures (Tg) have been measured in the interfaces of solution blended silica/poly(methyl methacrylate) (PMMA) nanocomposites using florescence spectroscopy and compared with Tg measured by differential scanning calorimetry (DSC). It was found that the two types of measurements yielded significantly different information. Combinations of silanes and poly(propylene glycol)-based molecular spacers bound to fluorophores were covalently linked to the surface of the nanoparticles, allowing for variation of the fluorophore response with respect to the distance from the nanofiller surface. Increases in the bulk Tg from the neat PMMA value were found upon the addition of nanofillers, but were independent of the nanofiller concentration when the filler concentration was above 2% by weight. Furthermore, as the size of the grafted molecular spacer was increased, Tg values were found to decrease and approach Tg of the neat PMMA. Owing to variable conformations of the spacers, an effective distribution of fluorophore-silica distances exists, which influences the fluorophores' response to the transition.
dc.description.sponsorship This research was supported by the National Science Foundation under Grant No. 0500324. Authors from UC3M would like to acknowledge CICYT for financial support (MAT 2007-63722).
dc.format.extent 8
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights © Elsevier, 2010
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Glass transition
dc.subject.other Nanocomposite
dc.subject.other Fluorescence spectroscopy
dc.title Molecular probe technique for determining local thermal transitions: The glass transition at Silica/PMMA nanocomposite interfaces
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1016/j.polymer.2010.08.051
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. MAT2007-63722
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 4891
dc.identifier.publicationissue 21
dc.identifier.publicationlastpage 4898
dc.identifier.publicationtitle Polymer
dc.identifier.publicationvolume 51
dc.identifier.uxxi AR/0000007263
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