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Impact of the clay organic modifier on the morphology of polymer-clay nanocomposites prepared by in Situ free-radical polymerization in emulsion

dc.contributor.authorGreesh N.
dc.contributor.authorHartmann P.C.
dc.contributor.authorCloete V.
dc.contributor.authorSanderson R.D.
dc.date.accessioned2011-05-15T16:03:41Z
dc.date.available2011-05-15T16:03:41Z
dc.date.issued2008
dc.identifier.citationJournal of Polymer Science, Part A: Polymer Chemistry
dc.identifier.citation46
dc.identifier.citation11
dc.identifier.issn0887624X
dc.identifier.other10.1002/pola.22701
dc.identifier.urihttp://hdl.handle.net/10019.1/12735
dc.description.abstractPoly(styrene-co-butyl acrylate) copolymers were prepared by free-radical random copolymerization of styrene and butyl acrylate in emulsion in the presence of 10% of surface-modified sodium montmorillonite (Na-MMT). The objective of this work was to evaluate the impact of the clay organic modifier in terms of its chemical structure, its degree of interaction within the clay galleries surface, and its ability to copolymerize with monomers, on the morphology and properties of the final nanocomposite prepared. Na-MMT was modified using different organic modifiers, namely: sodium 1-allyloxy-2- hydroxypropyl (Cops), 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), N-isopropylacrylamide (NIPA), and sodium 11-methacryloyloxy-unde-can-1-yl sulfate (MET), respectively. The morphology and properties of the nanocomposites obtained were found to be dependant on the clay organic modifier. X-ray diffraction (XRD) and transmission electron microscopy indicated that, nanocomposites at 10% clay loading with Cops-, NIPA-, and MET-modified clays, yielded intercalated to partially exfoliated structures, whereas AMPS-modified clay gave a nanocomposite with a fully exfoliated structure. All polymer-clay nanocomposites were found to be more thermally stable than neat poly(S-co-BA) as were determined by TGA. However, nanocomposites with intercalated structures exhibited greater thermal stability relative to fully exfoliated ones. Furthermore, nanocomposites with exfoliated structures exhibited higher storage moduli (GI) than partially exfoliated once, whereas intercalated structure showed the lowest GI values. © 2008 Wiley Periodicals, Inc.
dc.subjectAcrylic monomers
dc.subjectAlkali metals
dc.subjectAmides
dc.subjectBarium
dc.subjectCatalyst activity
dc.subjectChemical properties
dc.subjectChemical reactions
dc.subjectChemicals
dc.subjectCobalt
dc.subjectCobalt alloys
dc.subjectCobalt compounds
dc.subjectCopolymerization
dc.subjectElectron microscopes
dc.subjectElectron microscopy
dc.subjectElectron optics
dc.subjectFree radical polymerization
dc.subjectImaging techniques
dc.subjectKetones
dc.subjectMicrofluidics
dc.subjectMicroscopic examination
dc.subjectMonomers
dc.subjectMorphology
dc.subjectNanocomposites
dc.subjectNanostructured materials
dc.subjectPolymers
dc.subjectSilicate minerals
dc.subjectSodium
dc.subjectSodium sulfate
dc.subjectStyrene
dc.subjectSulfate minerals
dc.subjectSurface properties
dc.subjectSurfaces
dc.subjectThermodynamic stability
dc.subjectTransmission electron microscopy
dc.subjectX ray analysis
dc.subjectX ray diffraction analysis
dc.subject(1 1 0) surface
dc.subject(ethylene vinyl alcohol) copolymers
dc.subject(PL) properties
dc.subjectAllyloxy
dc.subjectButyl acrylate (BuA)
dc.subjectchemical structures
dc.subjectClay loadings
dc.subjectDegree of interaction
dc.subjectExfoliated structures
dc.subjectFree radical polymerization (FRP)
dc.subjectFree-radical
dc.subjectIn-situ
dc.subjectIntercalated structures
dc.subjectModified clays
dc.subjectN-isopropylacrylamide (PNIPAAm)
dc.subjectnano composites
dc.subjectOrganic modifiers
dc.subjectPolymer-clay nanocomposites (PCN)
dc.subjectSodium montmorillonite (NaMMT)
dc.subjectStorage modulus
dc.subjectthermal stability
dc.subjectX ray diffraction (XRD)
dc.subjectClay minerals
dc.titleImpact of the clay organic modifier on the morphology of polymer-clay nanocomposites prepared by in Situ free-radical polymerization in emulsion
dc.typeArticle
dc.description.versionArticle


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