Dielectric studies of segmental dynamics in epoxy nanocomposites

Pissis, P; Fragiadakis, D

dc.contributor.author	Pissis, P	en
dc.contributor.author	Fragiadakis, D	en
dc.date.accessioned	2014-03-01T01:26:08Z
dc.date.available	2014-03-01T01:26:08Z
dc.date.issued	2007	en
dc.identifier.issn	0022-2348	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17937
dc.subject	Dielectric spectroscopy	en
dc.subject	Epoxy networks	en
dc.subject	Glass transition	en
dc.subject	Relaxation strength	en
dc.subject	Relaxation time	en
dc.subject	Segmental dynamics	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Clay	en
dc.subject.other	Diamonds	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Epoxy resins	en
dc.subject.other	Ethers	en
dc.subject.other	Glass transition	en
dc.subject.other	Phenols	en
dc.subject.other	Relaxation time	en
dc.subject.other	Diglycidyl ethers	en
dc.subject.other	Epoxy networks	en
dc.subject.other	Relaxation strength	en
dc.subject.other	Segmental dynamics	en
dc.subject.other	Nanocomposites	en
dc.title	Dielectric studies of segmental dynamics in epoxy nanocomposites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/00222340601044284	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00222340601044284	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Dielectric techniques were employed, along with differential scanning calorimetry (DSC), to investigate segmental dynamics associated with the glass transition in epoxy nanocomposites. Two epoxy network matrices were used, the first based on diglycidyl ether of Bisphenol A (DGEBA) and diethylenetriamine, and the second on DGEBA and poly(oxypropylene)diamine (Jeffamine D2000). In the first matrix, the inclusions were organically modified clays, diamond particles with a diameter of about 6 nm, and conductive carbon nanoparticles with a diameter of about 10 nm, whereas in the second, polyhedral oligomeric silsesquioxanes (POSS) were covalently attached to the chains as dangling blocks. In the nanocomposites of the first matrix, glassy at room temperature, segmental dynamics becomes slower and the glass transition temperature increases on addition of the filler. In the epoxy/POSS nanocomposites, rubbery at room temperature, dynamics is described by a two-phase (layer) model: a fraction of the polymer is immobilized, obviously at interfaces with POSS, whereas the rest is slightly plasticized, compared to the pure matrix.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Journal of Macromolecular Science, Part B: Physics	en
dc.identifier.doi	10.1080/00222340601044284	en
dc.identifier.isi	ISI:000243498000011	en
dc.identifier.volume	46 B	en
dc.identifier.issue	1	en
dc.identifier.spage	119	en
dc.identifier.epage	136	en