α-β splitting region in the dielectric relaxation spectrum of PEA-PEMA sequential IPNs

Kyritsis, A; Gomez Ribelles, JL; Duenas, JMM; Campillo, NS; Ferrer, GG; Pradas, MM

dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Gomez Ribelles, JL	en
dc.contributor.author	Duenas, JMM	en
dc.contributor.author	Campillo, NS	en
dc.contributor.author	Ferrer, GG	en
dc.contributor.author	Pradas, MM	en
dc.date.accessioned	2014-03-01T01:21:42Z
dc.date.available	2014-03-01T01:21:42Z
dc.date.issued	2004	en
dc.identifier.issn	00249297	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16321
dc.subject	Dielectric Relaxation	en
dc.subject	Spectrum	en
dc.subject.other	Composition effects	en
dc.subject.other	Crosslinking	en
dc.subject.other	Density (specific gravity)	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Dynamic mechanical analysis	en
dc.subject.other	Mixing	en
dc.subject.other	Polymethyl methacrylates	en
dc.subject.other	Mechanical spectroscopy	en
dc.subject.other	Polyethyl acrylates	en
dc.subject.other	Interpenetrating polymer networks	en
dc.title	α-β splitting region in the dielectric relaxation spectrum of PEA-PEMA sequential IPNs	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ma034563h	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ma034563h	en
heal.publicationDate	2004	en
heal.abstract	The dielectric relaxation spectra of poly(ethyl acrylate)-i-poly(ethyl methacrylate) sequential interpenetrating polymer networks, IPNs, are presented. In addition, dynamic-mechanical data were used to study the compatibility of the networks as the main relaxation predominates on the secondary relaxation in mechanical spectroscopy. When the IPNs are highly cross-linked, both networks are forced to mix at the molecular level, and as a consequence, a single main dynamic mechanical relaxation appears. By contrast, when the cross-linking density is small, the individual relaxation behavior of the component networks can be observed. The poly(ethyl methacrylate) networks with low cross-linking density show the merging of the secondary β dielectric relaxation and the main α relaxation with the same characteristics as the poly(ethyl methacrylate) chain polymer. This behavior changes, however, in the highly cross-linked network in which the influence of the main relaxation on the overall behavior is smaller, and it was not possible to separate the α and β components in the merging region. The incorporation of the poly(ethyl acrylate) chains to the cooperative motions of the poly(ethyl methacrylate) network shifts the α and β relaxations to a different extent, which induces changes in the shape of the spectrum in the merging zone.	en
heal.journalName	Macromolecules	en
dc.identifier.doi	10.1021/ma034563h	en
dc.identifier.volume	37	en
dc.identifier.issue	2	en
dc.identifier.spage	446	en
dc.identifier.epage	452	en