Network-structure of plasticized epoxy resins by dynamic measurements

Spathis, G; Kontou, E; Theocaris, PS

dc.contributor.author	Spathis, G	en
dc.contributor.author	Kontou, E	en
dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:06:26Z
dc.date.available	2014-03-01T01:06:26Z
dc.date.issued	1985	en
dc.identifier.issn	0035-4511	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9380
dc.subject	crosslink density	en
dc.subject	free volume	en
dc.subject	Glass transition temperature	en
dc.subject	molecular weight	en
dc.subject.classification	Mechanics	en
dc.title	Network-structure of plasticized epoxy resins by dynamic measurements	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF01329264	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF01329264	en
heal.language	English	en
heal.publicationDate	1985	en
heal.abstract	Viscoelastic parameters are strongly connected with the glass transition temperature and the degree of cross-linking of polymers. In this paper an attempt was undertaken to analyse the storage modulus in the rubbery plateau and the transition region of a series of plasticized epoxy polymers, in terms of their network structure, by means of dynamic measurements. A series of dynamic tests was carried out at frequencies between 0.1 and 100 Hz and temperatures from 50 °C to 140 °C. By applying the time-temperature superposition principle, composite curves for the storage modulus E′ (ω) were derived over a wide frequency range. The crosslink density, or the molecular weight, between crosslinks could be changed by adding different amounts of plasticizer in the epoxy polymer, and it was calculated by applying the theory of rubber elasticity. The glass transition temperature Tg for each substance was found to be influenced by the amount of plasticizer and the molecular weight between crosslinks. This behaviour of the highly crosslinked epoxies was different from that of rubbers or analogous materials. Finally, an estimation of the free volume of the materials tested was attempted by using the WLF-equation. © 1985 Steinkopff.	en
heal.publisher	Steinkopff-Verlag	en
heal.journalName	Rheologica Acta	en
dc.identifier.doi	10.1007/BF01329264	en
dc.identifier.isi	ISI:A1985AFS4800009	en
dc.identifier.volume	24	en
dc.identifier.issue	1	en
dc.identifier.spage	63	en
dc.identifier.epage	68	en