Nanocatalysis in polyamide 6.6 solid-state polymerization

Boussia, AC; Konstantakopoulou, MO; Vouyiouka, SN; Papaspyrides, CD

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	https://dspace.lib.ntua.gr/xmlui/handle/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