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Rheological characterization and modeling of linear and branched metallocene polypropylenes prepared by reactive processing

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dc.title Rheological characterization and modeling of linear and branched metallocene polypropylenes prepared by reactive processing en
dc.contributor.author Pivokonský, Radek
dc.contributor.author Zatloukal, Martin
dc.contributor.author Filip, Petr
dc.contributor.author Tzoganakis, Costas
dc.relation.ispartof Journal of Non-Newtonian Fluid Mechanics
dc.identifier.issn 0377-0257 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2009
utb.relation.volume 156
utb.relation.issue 1-2
dc.citation.spage 1
dc.citation.epage 6
dc.type article
dc.language.iso en
dc.publisher Elsevier Science B.V. en
dc.identifier.doi 10.1016/j.jnnfm.2008.06.001
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0377025708001134
dc.subject Melt strength en
dc.subject Metallocene polypropylene en
dc.subject Elongational viscosity en
dc.description.abstract V této práci je srovnáno reologické chování tří různých typů metalocenových PP připravených reakčním vytlačováním jejichž molekulární struktura je následně charakterizována pomocí XPP a PTT-XPP modelů. cs
dc.description.abstract The aim of this contribution is to compare rheological behavior of three different samples of metallocene catalyzed polypropylene [virgin (linear) metallocene polypropylene (mPP), and (branched) mPPs prepared through reactive processing with (0.01 wt.%) and without peroxide]. For their theological description in different flow situations (shear and elongational) the extended Pom-Pom (XPP) and PTT-XPP models were used. A rotational rheometer (ARES 2000) with the SER Universal Testing Platform was used for the measurement of dynamic data (storage G' and loss G '' moduli) and uniaxial extensional viscosity. It was shown that both processed (branched) mPPs (with and without peroxide) exhibit distinct behavior in uniaxial extensional viscosity (appearance of strain hardening) in comparison to the virgin (linear) mPP. The XPP and PTT-XPP models proved their usefulness for a branching level quantification based on the measurements of steady shear and elongational viscosities. On the other hand, poorer models' predictions of the transient extensional viscosity indicate absence of an H branching for the processed mPPs. Based on the activation energy data it has been suggested that processed mPPs may have star-branched structure. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1001002
utb.identifier.rivid RIV/70883521:28110/09:63508108!RIV10-MSM-28110___
utb.identifier.obdid 43860829
utb.identifier.scopus 2-s2.0-57449114380
utb.identifier.wok 000263008600001
utb.source j-riv
utb.contributor.internalauthor Pivokonský, Radek
utb.contributor.internalauthor Zatloukal, Martin
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