Polycyanurate networks modified by polyoxytetramethylene glycol

Kripotou, S; Pissis, P; Kontou, E; Fainleib, AM; Grigoryeva, O; Bey, I

dc.contributor.author	Kripotou, S	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Kontou, E	en
dc.contributor.author	Fainleib, AM	en
dc.contributor.author	Grigoryeva, O	en
dc.contributor.author	Bey, I	en
dc.date.accessioned	2014-03-01T02:44:55Z
dc.date.available	2014-03-01T02:44:55Z
dc.date.issued	2007	en
dc.identifier.issn	0170-0839	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32016
dc.subject	Glass Transition	en
dc.subject	Mechanical Property	en
dc.subject	Strain Measurement	en
dc.subject	Structural Properties	en
dc.subject	Time Scale	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Dielectric properties	en
dc.subject.other	Gels	en
dc.subject.other	Glass transition	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Relaxation processes	en
dc.subject.other	Synthesis (chemical)	en
dc.subject.other	Thermal effects	en
dc.subject.other	Fragility	en
dc.subject.other	Heterogeneities	en
dc.subject.other	Relaxation strength	en
dc.subject.other	Polyethylene glycols	en
dc.title	Polycyanurate networks modified by polyoxytetramethylene glycol	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1007/s00289-006-0616-1	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s00289-006-0616-1	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	We report results obtained within a collaborative project dealing with the preparation of hybrid polycyanurate/polyoxytetramethylene glycol (PCN/PTMG) networks and the investigation of their structure-property relationships by a variety of experimental techniques. The hybrids were prepared from PCN and PTMG (molar mass 1.000 g/mol) with 10, 20, 30 and 40 wt% PTMG. The degree of incorporation of PTMG into the PCN network was determined by gel fraction measurements. WAXS and SAXS studies had indicated that the materials under investigation are amorphous and exhibit nanostructural heterogeneity, which increases with increasing amount of PTMG. Stress-strain measurements show improvement of the mechanical properties for PTMG contents of 30 and 40%. The focus in this paper is on the detailed investigation of the α relaxation associated with the glass transition in wide ranges of frequency and temperature by dielectric techniques. A single α relaxation was observed in all the compositions shifting systematically to lower temperatures/higher frequencies with increasing PTMG content. The results were systematically analyzed in terms of time scale and relaxation strength of the response and are discussed in terms of plasticization, presence of nanostructural heterogeneities and hybridization. Co-operativity of the α relaxation, quantified in terms of fragility, was found to decrease with increasing amount of PTMG, in correlation with increasing level of nanoheterogenity. © Springer-Verlag 2007.	en
heal.publisher	SPRINGER	en
heal.journalName	Polymer Bulletin	en
dc.identifier.doi	10.1007/s00289-006-0616-1	en
dc.identifier.isi	ISI:000243051200010	en
dc.identifier.volume	58	en
dc.identifier.issue	1	en
dc.identifier.spage	93	en
dc.identifier.epage	104	en