Nanocatalysis in polyamide 6.6 solid-state polymerization

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dc.contributor.author Boussia, AC en
dc.contributor.author Konstantakopoulou, MO en
dc.contributor.author Vouyiouka, SN en
dc.contributor.author Papaspyrides, CD en
dc.date.accessioned 2014-03-01T01:36:22Z
dc.date.available 2014-03-01T01:36:22Z
dc.date.issued 2011 en
dc.identifier.issn 1438-7492 en
dc.identifier.uri http://hdl.handle.net/123456789/21293
dc.subject catalysis en
dc.subject kinetics (polym.) en
dc.subject nanocomposites en
dc.subject polyamides en
dc.subject solid-state polymerization en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.classification Polymer Science en
dc.subject.other Amorphous regions en
dc.subject.other Chain extenders en
dc.subject.other Chain extension en
dc.subject.other Clay nanocomposites en
dc.subject.other End groups en
dc.subject.other Fixed-bed reactors en
dc.subject.other kinetics (polym.) en
dc.subject.other Nanocatalysis en
dc.subject.other Nucleated crystals en
dc.subject.other PA matrix en
dc.subject.other Polyamide 6.6 en
dc.subject.other Polyamide matrix en
dc.subject.other Positive effects en
dc.subject.other Rate acceleration en
dc.subject.other Reaction time en
dc.subject.other solid-state polymerization en
dc.subject.other Synergistic effect en
dc.subject.other Thermal protection en
dc.subject.other Thermal stabilizers en
dc.subject.other Amides en
dc.subject.other Catalysis en
dc.subject.other Chemical reactors en
dc.subject.other Morphology en
dc.subject.other Nanocomposites en
dc.subject.other Polyamides en
dc.subject.other Polymers en
dc.subject.other Rate constants en
dc.subject.other Polymerization en
dc.title Nanocatalysis in polyamide 6.6 solid-state polymerization en
heal.type journalArticle en
heal.identifier.primary 10.1002/mame.201000325 en
heal.identifier.secondary http://dx.doi.org/10.1002/mame.201000325 en
heal.language English en
heal.publicationDate 2011 en
heal.abstract Solid-state polymerization (SSP) of a poly(hexamethyleneadipamide) (PA 6.6)/clay nanocomposite system was studied. SSP runs were performed in a fixed-bed reactor, at temperatures 160-200°C and reaction times up to 8h. The influence of clay presence on the PA 6.6 SSP rate constant was herewith quantified for the first time to prove significant acceleration of the SSP process. A catalysis mechanism was suggested, according to which the positive effect of clay is of a synergistic origin attributed to nucleated crystal morphology, that increased the concentration of reactive end groups in the amorphous regions, to chain extension performed by clay SiOH groups, and to thermal protection of the polyamide matrix due to the presence of the nanoparticles. Nanocatalysis is for the first time introduced in solid-state polymerization (SSP) processes, by studying the effects of clay on PA 6.6 SSP. A rate acceleration of 53% is found, which is attributed to a synergistic effect of nanocomposite crystals morphology that increases the end groups concentration in the amorphous regions ""forcing"" them to react, of clay action as chain extender, as well as thermal stabilizer to the PA matrix. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. en
heal.publisher WILEY-V C H VERLAG GMBH en
heal.journalName Macromolecular Materials and Engineering en
dc.identifier.doi 10.1002/mame.201000325 en
dc.identifier.isi ISI:000287163600008 en
dc.identifier.volume 296 en
dc.identifier.issue 2 en
dc.identifier.spage 168 en
dc.identifier.epage 177 en

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