Polycyanurate-organically modified montmorillonite nanocomposites: Structure-dynamics-properties relationships

Bershtein, VA; Fainleib, AM; Pissis, P; Bei, IM; Dalmas, F; https://dspace.lib.ntua.gr/xmlui/bitstream/123456789/45467/1/%ce%93%ce%91%ce%9b%ce%95%ce%9d%ce%9f%ce%a3%20-%20%ce%9a%ce%95%ce%9a%ce%95%ce%a1%ce%97%ce%a3.pdfEgorova, LM; Gomza, YP; Kripotou, S; Maroulos, P; Yakushev, PN

dc.contributor.author	Bershtein, VA	en
dc.contributor.author	Fainleib, AM	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Bei, IM	en
dc.contributor.author	Dalmas, F	en
dc.contributor.author	Egorova, LM	en
dc.contributor.author	Gomza, YP	en
dc.contributor.author	Kripotou, S	en
dc.contributor.author	Maroulos, P	en
dc.contributor.author	Yakushev, PN	en
dc.date.accessioned	2014-03-01T01:29:01Z
dc.date.available	2014-03-01T01:29:01Z
dc.date.issued	2008	en
dc.identifier.issn	0022-2348	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19084
dc.subject	Dynamic heterogeneity	en
dc.subject	Dynamics	en
dc.subject	Polycyanurate-montmorrilonite nanocomposites	en
dc.subject	Properties	en
dc.subject	Structure	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Esters	en
dc.subject.other	Glass transition	en
dc.subject.other	Infrared spectroscopy	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Polymerization	en
dc.subject.other	Transmission electron microscopy	en
dc.subject.other	Dynamic heterogeneity	en
dc.subject.other	Laser-interferometric creep rate spectroscopy	en
dc.subject.other	Polycyanurate-montmorrilonite nanocomposites	en
dc.subject.other	Clay minerals	en
dc.title	Polycyanurate-organically modified montmorillonite nanocomposites: Structure-dynamics-properties relationships	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/00222340801955545	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00222340801955545	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Polycyanurate-modified montmorrilonite (PCN-MMT) nanocomposites were synthesized by polymerization of dicyanate ester of bisphenol A in the presence of MMT dispersed by ultrasound. Techniques of IR spectroscopy, WAXD, and TEM were applied to study polymerization kinetics and structure of the nanocomposites prepared, whereas their dynamics and thermal/mechanical properties over the -30 to 420 degrees C range were studied by using DSC, laser-interferometric creep rate spectroscopy (CRS), and dielectric relaxation spectroscopy (DRS) techniques. It was shown that a small amount of MMT additive acts as a catalyst of polymerization and results in the formation of complicated intercalated/exfoliated structures, as well as strongly modifies the dynamics in the PCN network. Pronounced dynamic heterogeneity was observed for PCN/MMT nanocomposites. Along with the main PCN glass transition, two new glass transitions, at much higher and much lower temperatures, were revealed as a consequence of constrained dynamics in matrix interfacial nanolayers and due to incomplete local cross-linking in the PCN matrix, respectively. In addition, increased sub-T-g mobility was observed in these nanocomposites. A two-fold rise of modulus of elasticity as well as increasing thermal stability and arising microplasticity at low temperatures, promoting, obviously, improved crack resistance in a brittle PCN network, were found for the PCN-MMT nanocomposites.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Journal of Macromolecular Science, Part B: Physics	en
dc.identifier.doi	10.1080/00222340801955545	en
dc.identifier.isi	ISI:000254631800013	en
dc.identifier.volume	47	en
dc.identifier.issue	3	en
dc.identifier.spage	555	en
dc.identifier.epage	575	en