Cooperative segmental motions in ethyl acrylate/triethylene glycol dimethacrylate copolymer networks studied by dielectric techniques

Stathopoulos, AT; Kyritsis, A; Ferrer, GG; Gomez Ribelles, JL; Christodoulides, C; Pissis, P

dc.contributor.author	Stathopoulos, AT	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Ferrer, GG	en
dc.contributor.author	Gomez Ribelles, JL	en
dc.contributor.author	Christodoulides, C	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:35:28Z
dc.date.available	2014-03-01T01:35:28Z
dc.date.issued	2011	en
dc.identifier.issn	0024-9297	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21062
dc.subject.classification	Polymer Science	en
dc.subject.other	Composition ranges	en
dc.subject.other	Cooperative motion	en
dc.subject.other	Cooperative relaxation	en
dc.subject.other	Copolymer networks	en
dc.subject.other	Crosslinker	en
dc.subject.other	Dielectric behavior	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Dielectric techniques	en
dc.subject.other	Dimethacrylates	en
dc.subject.other	Dynamic heterogeneity	en
dc.subject.other	Ethyl acrylates	en
dc.subject.other	Higher temperatures	en
dc.subject.other	Molecular relaxation	en
dc.subject.other	Poly(n-alkyl methacrylates)	en
dc.subject.other	Segmental motion	en
dc.subject.other	Spatial heterogeneity	en
dc.subject.other	Temperature dependence	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	Copolymerization	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Glass transition	en
dc.subject.other	Glycols	en
dc.subject.other	Merging	en
dc.subject.other	Molecular dynamics	en
dc.subject.other	Plastic products	en
dc.subject.other	Relaxation processes	en
dc.subject.other	Spectroscopy	en
dc.subject.other	Copolymers	en
dc.title	Cooperative segmental motions in ethyl acrylate/triethylene glycol dimethacrylate copolymer networks studied by dielectric techniques	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ma201755y	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ma201755y	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The molecular dynamics of ethyl acrylate/triethylene glycol dimethacrylate (EA/TrEGDMA) copolymer networks on the overall composition range were investigated thoroughly by employing dielectric techniques: thermally stimulated depolarization currents (TSDC) and dielectric relaxation spectroscopy (DRS). Furthermore, differential scanning calorimetry (DSC) was performed in order to investigate the thermal glass transition of these copolymers. The results show that, for low content of the TrEGDMA component, the overall dielectric behavior of the copolymers is dictated by the dynamics of PEA component, exhibiting the alpha(cop) relaxation process which is strongly affected by the TrEGDMA moieties becoming broader and shifting to higher temperatures with increasing cross-linker (TrEGDMA) content. For the copolymer networks rich in TrEGDMA (w(TE) >= 40 wt %), the overall dielectric behavior indicates that the dynamics of the dimethacrylate component dominates, resembling that of poly(n-alkyl methacrylates) in the sense that the temperature dependence of molecular relaxation processes presents a merging region where the local relaxation process of TrEGDMA, beta(PTE), merges with the more cooperative alpha(cop) process of the copolymers into an alpha beta(cop) locally cooperative relaxation process. By increasing the EA content, the strength of alpha(cop) relaxation process enhances and simultaneously the merging region shifts to lower temperatures. The cooperative motions are significantly suppressed in the copolymers with TrEGDMA contents higher that 80 wt %. The copolymers present enhanced spatial heterogeneity the more TrEGDMA content, whereas no dynamic heterogeneity was detected.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Macromolecules	en
dc.identifier.doi	10.1021/ma201755y	en
dc.identifier.isi	ISI:000295907200042	en
dc.identifier.volume	44	en
dc.identifier.issue	20	en
dc.identifier.spage	8233	en
dc.identifier.epage	8244	en