Thermomechanical behavior of metallocene ethylene-α-olefin copolymers

Kontou, E; Niaounakis, M; Spathis, G

dc.contributor.author	Kontou, E	en
dc.contributor.author	Niaounakis, M	en
dc.contributor.author	Spathis, G	en
dc.date.accessioned	2014-03-01T01:18:26Z
dc.date.available	2014-03-01T01:18:26Z
dc.date.issued	2002	en
dc.identifier.issn	0014-3057	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15010
dc.subject	β- and γ-transitions	en
dc.subject	DSC	en
dc.subject	Dynamic mechanical behavior	en
dc.subject	Ethylene-octene copolymers	en
dc.subject	SEM	en
dc.subject	Ziegler-Natta and metallocene catalysis	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Catalysts	en
dc.subject.other	Deformation	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Ethylene	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Strain	en
dc.subject.other	Strain hardening	en
dc.subject.other	Stresses	en
dc.subject.other	Thermomechanical properties	en
dc.subject.other	Copolymers	en
dc.title	Thermomechanical behavior of metallocene ethylene-α-olefin copolymers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0014-3057(02)00148-9	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0014-3057(02)00148-9	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The thermal, dynamic mechanical and stress-strain properties of a set of commercial LLDPEs prepared by metallocene catalysts were studied and compared with two LLDPEs obtained with traditional Ziegler-Natta catalysts. The type and amount of comonomer strongly affects the degree of crystallinity and branching, resulting in different material morphology and macroscopic thermomechanical behavior. Within each set of ethylene-alpha-olefin copolymers a gradual decrease in the percentage crystallinity and position and intensity of beta- and gamma-transition is observed, with respect to the comonomer content. In addition, the studied materials are characterized by the absence of an alpha-transition. This behavior is attributed to the high comonomer content (5-24)%. Tensile behavior changes from the typical necking, cold drawing and strain hardening to the uniform elastomeric deformation, as the comonomer content increases. The experimental methods used, in combination with scanning electron microscopy, lead to converged results, while tensile testing proved to be sensitive to the crystallite size and distribution. (C) 2002 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	European Polymer Journal	en
dc.identifier.doi	10.1016/S0014-3057(02)00148-9	en
dc.identifier.isi	ISI:000179277400018	en
dc.identifier.volume	38	en
dc.identifier.issue	12	en
dc.identifier.spage	2477	en
dc.identifier.epage	2487	en