Evaluation of thermally induced degradation of branched polypropylene by using rheology and different constitutive equations

Drábek, Jiří; Zatloukal, Martin

dc.title	Evaluation of thermally induced degradation of branched polypropylene by using rheology and different constitutive equations	en
dc.contributor.author	Drábek, Jiří
dc.contributor.author	Zatloukal, Martin
dc.relation.ispartof	Polymers
dc.identifier.issn	2073-4360 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued	2016
utb.relation.volume	8
utb.relation.issue	9
dc.type	article
dc.language.iso	en
dc.publisher	MDPI AG
dc.identifier.doi	10.3390/polym8090317
dc.relation.uri	http://www.mdpi.com/2073-4360/8/9/317
dc.subject	Branched polypropylene	en
dc.subject	Constitutive equations	en
dc.subject	Polymer melts	en
dc.subject	Thermal degradation	en
dc.subject	Uniaxial extensional viscosity	en
dc.description.abstract	In this work, virgin as well as thermally degraded branched polypropylenes were investigated by using rotational and Sentmanat extensional rheometers, gel permeation chromatography and different constitutive equations. Based on the obtained experimental data and theoretical analysis, it has been found that even if both chain scission and branching takes place during thermal degradation of the tested polypropylene, the melt strength (quantified via the level of extensional strain hardening) can increase at short degradation times. It was found that constitutive equations such as Generalized Newtonian law, modified White-Metzner model, Yao and Extended Yao models have the capability to describe and interpret the measured steady-state rheological data of the virgin as well as thermally degraded branched polypropylenes. Specific attention has been paid to understanding molecular changes during thermal degradation of branched polypropylene by using physical parameters of utilized constitutive equations. © 2016 by the authors; licensee MDPI, Basel, Switzerland.	en
utb.faculty	Faculty of Technology
dc.identifier.uri	http://hdl.handle.net/10563/1006746
utb.identifier.obdid	43875261
utb.identifier.scopus	2-s2.0-84990051436
utb.identifier.wok	000385533500007
utb.source	j-scopus
dc.date.accessioned	2016-12-22T16:19:04Z
dc.date.available	2016-12-22T16:19:04Z
dc.description.sponsorship	Grant Agency of the Czech Republic [16-05886S]; TBU - resources of specific university research [Zlin IGA/FT/2016/007]
dc.rights	Attribution 4.0 International
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/
dc.rights.access	openAccess
utb.contributor.internalauthor	Drábek, Jiří
utb.contributor.internalauthor	Zatloukal, Martin
utb.fulltext.affiliation	Jiri Drabek and Martin Zatloukal * Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic; drabek@ft.utb.cz * Correspondence: mzatloukal@ft.utb.cz; Tel.: +420-57-603-1320
utb.fulltext.dates	Received: 27 June 2016; Accepted: 15 August 2016; Published: 24 August 2016
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utb.fulltext.sponsorship	The authors wish to acknowledge Grant Agency of the Czech Republic (Grant registration No. 16-05886S) for the financial support. This study was also supported by the internal grant of TBU in Zlín IGA/FT/2016/007 funded from the resources of specific university research. The author also wishes to acknowledge Joachim Fiebig (Borealis Polyolefine) for donation of the PP Daploy WB180HMS polymer sample and help with the GPC measurements and analysis, as well as Donggang Yao (Georgia Institute of Technology) for providing a detailed explanation of his model.
utb.fulltext.projects	16-05886S
utb.fulltext.projects	IGA/FT/2016/007