Dielectric studies of phase morphology and molecular mobility in novel nanocomposites based on polyimide

Pissis, P; Kanapitsas, A; Georgoussis, G; Bershtein, VA; Sysel, P

dc.contributor.author	Pissis, P	en
dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Georgoussis, G	en
dc.contributor.author	Bershtein, VA	en
dc.contributor.author	Sysel, P	en
dc.date.accessioned	2014-03-01T01:17:42Z
dc.date.available	2014-03-01T01:17:42Z
dc.date.issued	2002	en
dc.identifier.issn	0963-6935	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14635
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0036367615&partnerID=40&md5=882f8be280656b5950c56618cf6eb255	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.other	polyimide	en
dc.subject.other	resin	en
dc.subject.other	silicon dioxide	en
dc.subject.other	article	en
dc.subject.other	chemical bond	en
dc.subject.other	chemical structure	en
dc.subject.other	covalent bond	en
dc.subject.other	depolarization	en
dc.subject.other	dielectric constant	en
dc.subject.other	differential scanning calorimetry	en
dc.subject.other	hybrid	en
dc.subject.other	molecular dynamics	en
dc.subject.other	morphology	en
dc.subject.other	nanoparticle	en
dc.subject.other	phase transition	en
dc.subject.other	spectroscopy	en
dc.subject.other	temperature dependence	en
dc.subject.other	thermal stimulation	en
dc.title	Dielectric studies of phase morphology and molecular mobility in novel nanocomposites based on polyimide	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Broadband dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarisation currents (TSDC) techniques were employed to investigate and molecular mobility in relation to phase morphology in novel nanocomposites based on polyimide (PI). In addition to dielectric techniques, differential scanning calorimetry (DSC) and creep rate spectroscopy (CRS) provided information on phase transitions and relaxation behaviour of the composites. The systems investigated include nanophase-separated polyimide-silica (PI-SiO2) hybrid materials with covalent bonds between the components and rod-like polyimide (PIR) / flexible chain polyimide (PIF) molecular composites. The combination of several complementary techniques allowed to investigate the dynamic behaviour of PI in these systems in wide ranges of frequency and temperature. All the experiments indicated pronounced deviations from additivity in the dynamics of the composites. The results are discussed in terms of enhancement of small-scale motion due to loosened molecular packing of PI chains confined in nanovolumes and of reduction of large-scale chain mobility due to constraining effects and due to chemical bonds between the components.	en
heal.publisher	ADCOTEC LTD	en
heal.journalName	Advanced Composites Letters	en
dc.identifier.isi	ISI:000177598600001	en
dc.identifier.volume	11	en
dc.identifier.issue	2	en
dc.identifier.spage	49	en
dc.identifier.epage	58	en