Effect of long branches on the rheology of polypropylene

Gotsis, AD; Zeevenhoven, BLF; Tsenoglou, C

dc.contributor.author	Gotsis, AD	en
dc.contributor.author	Zeevenhoven, BLF	en
dc.contributor.author	Tsenoglou, C	en
dc.date.accessioned	2014-03-01T01:20:17Z
dc.date.available	2014-03-01T01:20:17Z
dc.date.issued	2004	en
dc.identifier.issn	0148-6055	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15882
dc.subject.classification	Mechanics	en
dc.subject.other	Catalysts	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Elasticity	en
dc.subject.other	Molecular weight	en
dc.subject.other	Rheology	en
dc.subject.other	Sampling	en
dc.subject.other	Strain hardening	en
dc.subject.other	Long chain branching	en
dc.subject.other	Melt strength	en
dc.subject.other	Melting points	en
dc.subject.other	Relaxation spectrum	en
dc.subject.other	Polypropylenes	en
dc.title	Effect of long branches on the rheology of polypropylene	en
heal.type	journalArticle	en
heal.identifier.primary	10.1122/1.1764823	en
heal.identifier.secondary	http://dx.doi.org/10.1122/1.1764823	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	In order to study the rheology of long chain branched polymers, branches have been added on linear polypropylene precursors in varying amounts using reactive modification with peroxydicarbonates. The branched polypropylene samples show distinct strain hardening, something absent from the linear melt; this considerably improves the melt strength of the modified polymer. The zero shear viscosity and the elasticity measured by the relaxation spectrum also increase with the number of branches per molecule. Two models are applied to describe strain hardening of the viscosity during the course of elongation. The model parameters were found to vary systematically with the degree of branching and, therefore, their values can be used as a measure of this. Consequently, fluidity, elasticity, strain hardening, and melt strength are all related to the degree of long chain branching. (C) 2004 The Society of Rheology.	en
heal.publisher	JOURNAL OF RHEOLOGY AMER INST PHYSICS	en
heal.journalName	Journal of Rheology	en
dc.identifier.doi	10.1122/1.1764823	en
dc.identifier.isi	ISI:000222452900011	en
dc.identifier.volume	48	en
dc.identifier.issue	4	en
dc.identifier.spage	895	en
dc.identifier.epage	914	en