Influence of plasticizer on Poisson's ratio of epoxy polymers

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:05:46Z
dc.date.available	2014-03-01T01:05:46Z
dc.date.issued	1979	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/8973
dc.subject	poisson's ratio	en
dc.subject.classification	Polymer Science	en
dc.subject.other	MATERIALS TESTING - Tensile Tests	en
dc.subject.other	MATHEMATICAL TECHNIQUES	en
dc.subject.other	PLASTICIZERS	en
dc.subject.other	PLASTICS - Creep	en
dc.subject.other	THERMODYNAMICS	en
dc.subject.other	EPOXY RESINS	en
dc.title	Influence of plasticizer on Poisson's ratio of epoxy polymers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0032-3861(79)90308-2	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0032-3861(79)90308-2	en
heal.language	English	en
heal.publicationDate	1979	en
heal.abstract	A series of simultaneous isothermal tensile creep measurements of the longitudinal extension and the lateral contraction in standard thin tension specimens yielded individual curves for the variation of the lateral contraction ratio (Poisson's ratio) at different loading and temperature steps throughout the viscoelastic spectrum for a series of pure and plasticized cold-setting epoxy polymers. By applying the principle of reduced variables and shifting the isothermal creep curves along the log(time) scale, composite curves were obtained for Poisson's ratio which have the shape of sigmoid curves, thus proving the dependence of this viscoelastic function on time and temperature. It was shown that the corresponding transition regions were shifted towards the origin (t = 0) as the amount of plasticizer was increased, while the shape of the corresponding composite curves did not change and the variation of the logarithmic time factor remained essentially the same but with steeper gradients for increasing amounts of plasticizer. Comparison of the viscoelastic spectra for this function with the corresponding spectra for creep extension, shear and bulk compliances found previously indicated that the spectrum of this function is broader than the others and while it starts to appear earlier than the shear compliance spectrum it disappears after the corresponding bulk compliance spectrum. Finally, glass transition temperatures for the various mixtures were found to be lower by 5° to 10°C than those obtained from measurements using a thermal analyser. © 1979.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/0032-3861(79)90308-2	en
dc.identifier.isi	ISI:A1979HL84600023	en
dc.identifier.volume	20	en
dc.identifier.issue	9	en
dc.identifier.spage	1149	en
dc.identifier.epage	1154	en