Effects of processing conditions on rheological, thermal, and electrical properties of multiwall carbon nanotube/epoxy resin composites

Ivanov, E; Kotsilkova, R; Krusteva, E; Logakis, E; Kyritsis, A; Pissis, P; Silvestre, C; Duraccio, D; Pezzuto, M

dc.contributor.author	Ivanov, E	en
dc.contributor.author	Kotsilkova, R	en
dc.contributor.author	Krusteva, E	en
dc.contributor.author	Logakis, E	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Silvestre, C	en
dc.contributor.author	Duraccio, D	en
dc.contributor.author	Pezzuto, M	en
dc.date.accessioned	2014-03-01T01:35:37Z
dc.date.available	2014-03-01T01:35:37Z
dc.date.issued	2011	en
dc.identifier.issn	0887-6266	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21121
dc.subject	conductive	en
dc.subject	epoxy resin	en
dc.subject	multiwalled carbon nanotubes	en
dc.subject	nanocomposites	en
dc.subject	network	en
dc.subject	processing	en
dc.subject	rheology	en
dc.subject	structure-property relations	en
dc.subject	thermal properties	en
dc.subject.classification	Polymer Science	en
dc.subject.other	conductive	en
dc.subject.other	Multi-walled	en
dc.subject.other	network	en
dc.subject.other	structure-property relations	en
dc.subject.other	thermal properties	en
dc.subject.other	Curing	en
dc.subject.other	Degradation	en
dc.subject.other	Dispersions	en
dc.subject.other	Elasticity	en
dc.subject.other	Electric properties	en
dc.subject.other	Epoxy resins	en
dc.subject.other	Functional polymers	en
dc.subject.other	Magnetic fields	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Optical microscopy	en
dc.subject.other	Organic compounds	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Rheology	en
dc.subject.other	Solvents	en
dc.subject.other	Synthetic resins	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Viscosity	en
dc.subject.other	Visualization	en
dc.subject.other	Multiwalled carbon nanotubes (MWCN)	en
dc.title	Effects of processing conditions on rheological, thermal, and electrical properties of multiwall carbon nanotube/epoxy resin composites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/polb.22199	en
heal.identifier.secondary	http://dx.doi.org/10.1002/polb.22199	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	We report on the effect of processing conditions on rheology, thermal and electrical properties of nanocomposites containing 0.02-0.3 wt % multiwall carbon nanotubes in an epoxy resin. The influence of the sonication, the surface functionalization during mixing, as well as the application of external magnetic field (EMF) throughout the curing process was examined. Rheological tests combined with optical microscopy visualization are proved as a very useful methodology to determine the optimal processing conditions for the preparation of the nanocomposites. The Raman spectra provide evidence for more pronounced effect on the functionalized with hardener compositions, particularly by curing upon application of EMF. Different chain morphology of CNTs is created depending of the preparation conditions, which induced different effects on the thermal and electrical properties of the nanocomposites. The thermal degradation peak is significantly shifted towards higher temperatures by increasing the nanotube content, this confirming that even the small amount of carbon nanotubes produces a strong barrier effect for the volatile products during the degradation. The ac conductivity measurements revealed lower values of the percolation threshold (pc) in the range of 0.03-0.05 wt %. CNTs for the nanocomposites produced by preliminary dispersing of nanotubes in the epoxy resin, compared to those prepared by preliminary functionalization of the nanotubes in the amine hardener. This is attributed to the higher viscosity and stronger interfacial interactions of the amine hardener/CNT dispersion which restricts the reorganization of the nanotubes. The application of the EMF does not influence the pc value but the dc conductivity values (rdc) of the nanocomposites increased at about one order of magnitude due to the development of the aforementioned chain structure. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 431-442, 2011	en
heal.publisher	WILEY-BLACKWELL	en
heal.journalName	Journal of Polymer Science, Part B: Polymer Physics	en
dc.identifier.doi	10.1002/polb.22199	en
dc.identifier.isi	ISI:000288037700006	en
dc.identifier.volume	49	en
dc.identifier.issue	6	en
dc.identifier.spage	431	en
dc.identifier.epage	442	en