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dc.creatorStojanović, D.
dc.creatorOrlović, A.
dc.creatorMarković, Smilja
dc.creatorRadmilović, Velimir R.
dc.creatorUskoković, Petar S.
dc.creatorAleksić, Radoslav
dc.date.accessioned2018-07-06T16:40:26Z
dc.date.available2018-07-06T16:40:26Z
dc.date.issued2009
dc.identifier.issn0022-2461
dc.identifier.urihttps://dais.sanu.ac.rs/123456789/3457
dc.description.abstractNanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA composite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.en
dc.publisherSpringer
dc.rightsrestrictedAccess
dc.sourceJournal of Materials Science
dc.subjectnanosilica/poly(methyl methacrylate)
dc.subjectPMMA
dc.subjectcomposite materials
dc.titleNanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixtureen
dc.typearticleen
dc.rights.licenseARR
dcterms.abstractМарковић, Смиља; Стојановић, Д.; Орловић, A.; Радмиловић, Велимир; Ускоковић, Петар С.; Aлексић, Р.;
dc.citation.spage6223
dc.citation.epage6232
dc.citation.volume44
dc.citation.issue23
dc.identifier.wos000270385100002
dc.identifier.doi10.1007/s10853-009-3842-8
dc.identifier.scopus2-s2.0-70349652528
dc.type.versionpublishedVersion
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_dais_3457


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Приказ основних података о документу