Rheological properties of RAFT-mediated poly(styrene-co-butyl acrylate)-clay nanocomposites [P(S-co-BA)-PCNs]: Emphasis on the effect of structural parameters on thermo-mechanical and melt flow behaviors

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dc.contributor.authorSamakande A.
dc.contributor.authorSanderson R.D.
dc.contributor.authorHartmann P.C.
dc.date.accessioned2011-05-15T16:02:16Z
dc.date.available2011-05-15T16:02:16Z
dc.date.issued2009
dc.description.abstractRAFT-mediated random poly(styrene-co-butyl acrylate)-[N-(4-((((dodecylthio)-carbonothioyl)thio)methyl)benzyl)-N,N-dimethylethanammonium]-clay nanocomposites (P(S-co-BA)-DCTBAB-PCNs) and poly(styrene-co-butyl acrylate)-[N,N-dimethyl-N-(4-(((phenylcarbonothioyl)thio)-methyl)benzyl)ethanammonium]-clay nanocomposites (P(S-co-BA)-PCDBAB-PCNs) were prepared by miniemulsion free-radical polymerization. The RAFT agents (i.e. DCTBAB and PCDBAB) were anchored onto the clay layers prior to polymerization, and were able to control the polymerization process, as evident from the decreasing molar mass and polydispersity index (PDI) values as the concentration of the RAFT agent in the system increased. The efficiency of the anchored RAFT agents increased as the RAFT agent concentration in the system increased, i.e. as the clay loading increased. The nanocomposites that were prepared were found to have a partially exfoliated morphology at low clay loadings, as determined by SAXS and TEM, whereas, at high clay loadings the morphology changed to become predominantly intercalated. The thermo-mechanical properties of the nanocomposites were found to be a function of the molar mass, PDI, PCN morphology, and clay loading. In the glassy state, the storage modulus was seen to effectively decrease as clay loading increased, whereas the opposite was true for the loss modulus and tan delta. At low clay loadings the melt rheological properties were dominated by the matrix effects, whereas at high clay loadings the effect of the clay filler dominated, resulting in pseudo solid-liquid-like behavior. © 2008 Elsevier Ltd. All rights reserved.
dc.description.versionArticle
dc.identifier.citationPolymer
dc.identifier.citation50
dc.identifier.citation1
dc.identifier.issn323861
dc.identifier.other10.1016/j.polymer.2008.10.050
dc.identifier.urihttp://hdl.handle.net/10019.1/12394
dc.subjectAgents
dc.subjectChemical reactions
dc.subjectFree radical polymerization
dc.subjectLoading
dc.subjectMechanical properties
dc.subjectMonomers
dc.subjectNanocomposites
dc.subjectPolydispersity
dc.subjectPolymer matrix composites
dc.subjectPolymer melts
dc.subjectPolymeric glass
dc.subjectPolymerization
dc.subjectPolymers
dc.subjectPolystyrenes
dc.subjectRheology
dc.subjectStyrene
dc.subjectThermomechanical treatment
dc.subjectButyl acrylates
dc.subjectClay fillers
dc.subjectClay layers
dc.subjectClay loadings
dc.subjectDodecylthio
dc.subjectGlassy states
dc.subjectLoss modulus
dc.subjectMatrix effects
dc.subjectMelt flows
dc.subjectMiniemulsion
dc.subjectPolydispersity indices
dc.subjectPolymerization processes
dc.subjectRadical polymerizations
dc.subjectRaft agents
dc.subjectReversible addition-fragmentation chain transfer
dc.subjectRheological properties
dc.subjectStorage modulus
dc.subjectStructural parameters
dc.subjectThermo mechanicals
dc.subjectThermo-mechanical properties
dc.subjectClay minerals
dc.subjectconcentration
dc.subjectemulsion
dc.subjectloading (testing)
dc.subjectmorphology
dc.subjectnanocomposite
dc.subjectpolymerization
dc.subjectrheology
dc.subjectthermodynamics
dc.titleRheological properties of RAFT-mediated poly(styrene-co-butyl acrylate)-clay nanocomposites [P(S-co-BA)-PCNs]: Emphasis on the effect of structural parameters on thermo-mechanical and melt flow behaviors
dc.typeArticle
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