Polymer dynamics in polyurethane/clay nanocomposites studied by dielectric and thermal techniques

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dc.contributor.author Kripotou, S en
dc.contributor.author Pissis, P en
dc.contributor.author Savelyev, YV en
dc.contributor.author Robota, LP en
dc.contributor.author Travinskaya, TV en
dc.date.accessioned 2014-03-01T01:34:18Z
dc.date.available 2014-03-01T01:34:18Z
dc.date.issued 2010 en
dc.identifier.issn 0022-2348 en
dc.identifier.uri http://hdl.handle.net/123456789/20687
dc.subject Dielectric relaxation en
dc.subject Glass transition en
dc.subject Immobilized polymer en
dc.subject Polymer dynamics en
dc.subject Polyurethane/clay nanocomposites en
dc.subject.classification Polymer Science en
dc.subject.other Broadband dielectric relaxation spectroscopy en
dc.subject.other Chain extenders en
dc.subject.other Dimethylhydrazine en
dc.subject.other Diphenylmethane diisocyanate en
dc.subject.other Glass transition dynamics en
dc.subject.other Good correlations en
dc.subject.other matrix en
dc.subject.other Microphase-separated structure en
dc.subject.other Morphology and dynamics en
dc.subject.other Organically modified montmorillonite en
dc.subject.other Polymer dynamics en
dc.subject.other Polyurethane/clay nanocomposites en
dc.subject.other Solution casting en
dc.subject.other Thermal techniques en
dc.subject.other Thermally stimulated depolarization currents en
dc.subject.other Weight fractions en
dc.subject.other Wide angle X-ray scattering en
dc.subject.other Clay minerals en
dc.subject.other Dielectric relaxation en
dc.subject.other Differential scanning calorimetry en
dc.subject.other Glass en
dc.subject.other Glycols en
dc.subject.other Mechanical properties en
dc.subject.other Nanocomposites en
dc.subject.other Reconnaissance aircraft en
dc.subject.other Silicate minerals en
dc.subject.other Spectroscopy en
dc.subject.other Vibrations (mechanical) en
dc.subject.other Glass transition en
dc.title Polymer dynamics in polyurethane/clay nanocomposites studied by dielectric and thermal techniques en
heal.type journalArticle en
heal.identifier.primary 10.1080/00222340903344309 en
heal.identifier.secondary http://dx.doi.org/10.1080/00222340903344309 en
heal.language English en
heal.publicationDate 2010 en
heal.abstract Differential scanning calorimetry (DSC), broadband dielectric relaxation spectroscopy (DRS), and thermally stimulated depolarization current (TSDC) techniques were employed to investigate glass transition and polymer dynamics in nanocomposites of polyurethane (PU) and organically modified montmorillonite (MMT) (weight fraction 0%-15%) prepared by solution casting. The PU matrix was obtained from oligo(oxytetramethylene glycol) of molar mass 1000 g/mol, 4,4'-diphenylmethane diisocyanate and 1,1-dimethylhydrazine as chain extender. Wide-angle X-ray scattering confirmed the formation of partly exfoliated structures at low MMT content. DSC, DRS, and TSDC show, in agreement with each other, that a fraction of polymer makes no contribution to the glass transition and to the corresponding relaxation, whereas the rest exhibits similar glass transition dynamics as the pure matrix. This fraction of immobilized polymer reaches a maximum at about 5 wt% MMT. Effects of MMT on the microphase-separated structure of PU are negligible, as indicated by the study of glass transition and interfacial dielectric polarization/relaxation. No effects of MMT on the local, secondary and relaxations were observed. Mechanical properties show a maximum improvement at about 5 wt% MMT, in good correlation with morphology and dynamics. en
heal.publisher TAYLOR & FRANCIS INC en
heal.journalName Journal of Macromolecular Science, Part B: Physics en
dc.identifier.doi 10.1080/00222340903344309 en
dc.identifier.isi ISI:000273632100008 en
dc.identifier.volume 49 en
dc.identifier.issue 1 en
dc.identifier.spage 86 en
dc.identifier.epage 110 en

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