Polytetramethylene glycol-modified polycyanurate matrices reinforced with nanoclays: Synthesis and thermomechanical performance

Anthoulis, GI; Kontou, E; Fainleib, A; Bei, I

dc.contributor.author	Anthoulis, GI	en
dc.contributor.author	Kontou, E	en
dc.contributor.author	Fainleib, A	en
dc.contributor.author	Bei, I	en
dc.date.accessioned	2014-03-01T01:31:41Z
dc.date.available	2014-03-01T01:31:41Z
dc.date.issued	2009	en
dc.identifier.issn	0191-5665	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19879
dc.subject	Organoclay	en
dc.subject	Polycyanurate	en
dc.subject	Thermomechanical properties	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Cyanate esters	en
dc.subject.other	Degree of agglomeration	en
dc.subject.other	Elongation at break	en
dc.subject.other	Filler dispersion	en
dc.subject.other	Glassy state	en
dc.subject.other	Hydroxyl-terminated	en
dc.subject.other	matrix	en
dc.subject.other	Nano clays	en
dc.subject.other	Nanophase morphology	en
dc.subject.other	Polycyanurate	en
dc.subject.other	Polycyanurates	en
dc.subject.other	Polycyclotrimerization	en
dc.subject.other	Polytetramethylene glycols	en
dc.subject.other	SEM	en
dc.subject.other	Stiffening effect	en
dc.subject.other	Storage moduli	en
dc.subject.other	Stress-strain measurement	en
dc.subject.other	Thermo-mechanical performance	en
dc.subject.other	Thermomechanical properties	en
dc.subject.other	Weight ratios	en
dc.subject.other	Young's Modulus	en
dc.subject.other	Agglomeration	en
dc.subject.other	Competition	en
dc.subject.other	Dynamic analysis	en
dc.subject.other	Dynamic mechanical analysis	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Elasticity	en
dc.subject.other	Esterification	en
dc.subject.other	Esters	en
dc.subject.other	Ethylene glycol	en
dc.subject.other	Fracture mechanics	en
dc.subject.other	Glass transition	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Organoclay	en
dc.subject.other	Resins	en
dc.subject.other	Stress-strain curves	en
dc.subject.other	Stresses	en
dc.subject.other	Tensile strength	en
dc.subject.other	Thermomechanical treatment	en
dc.subject.other	Mechanical properties	en
dc.title	Polytetramethylene glycol-modified polycyanurate matrices reinforced with nanoclays: Synthesis and thermomechanical performance	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s11029-009-9073-x	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s11029-009-9073-x	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The outstanding improvement in the physical properties of cyanate esters (CEs) compared with those of competitor resins, such as epoxies, has attracted appreciable attention recently. Cyanate esters undergo thermal polycyclotrimerization to give polycyanurates (PCNs). However, like most thermo setting resins, the main draw back of CEs is brittleness. To over come this disadvan tage, CEs can be toughened by the introduction of polytetramethylene glycol (PTMG), a hydroxyl-terminated polyether. How ever, PTMG has a detrimental impact on Young's modulus. To simultaneously enhance both the ductility and the stiffness of CE, we added PTMG and an organoclay (mont morillonite, MMT) to it. A series of PCN/PTMG/MMT nanocomposites with a constant PTMG weight ratio was pre pared, and the resulting nanophase morphology, i.e., the degree of filler dispersion and distribution in the composite and the thermomechanical properties, in terms of glass-transition behaviour, Young's modulus, tensile strength, and elongation at break, were examined using the scanning elec tron micros copy (SEM), a dynamic mechanical analysis (DMA), and stress-strain measurements, re spectively. It was found that, at a content of MMT below 2 wt.%, MMT nanoparticles were distributed uniformly in the matrix, suggesting a lower degree of agglomeration for these materials. In the glassy state, the significant increase in the storage modulus revealed a great stiffening effect of MMT due to its high Young's modulus. The modification with PTMG led to a 233% greater elongation at break compared with that of neat PCN. The nanocomposites exhibited an invariably higher Young's modulus than PCN/PTMG for all the volume factors of organoclay examined, with the 2 wt.% material displaying the most pronounced in crease in the modulus, in agreement with micros copy results. © 2009 Springer Science+Business Media, Inc.	en
heal.publisher	SPRINGER	en
heal.journalName	Mechanics of Composite Materials	en
dc.identifier.doi	10.1007/s11029-009-9073-x	en
dc.identifier.isi	ISI:000266665000007	en
dc.identifier.volume	45	en
dc.identifier.issue	2	en
dc.identifier.spage	175	en
dc.identifier.epage	182	en