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Rheological characterization and modeling of linear and branched metallocene polypropylenes prepared by reactive processing
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SYSNO ASEP 0319623 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Rheological characterization and modeling of linear and branched metallocene polypropylenes prepared by reactive processing Title Reologická charakterizace a modelování lineárních a rozvětvených metalocénových propylenů připravených pomocí reaktivního vytlačování Author(s) Pivokonský, Radek (UH-J) SAI, ORCID, RID
Zatloukal, M. (CZ)
Filip, Petr (UH-J) ORCID, RID, SAI
Tzoganakis, C. (CA)Source Title Journal of Non-Newtonian Fluid Mechanics. - : Elsevier - ISSN 0377-0257
Roč. 156, 1-2 (2009), s. 1-6Number of pages 7 s. Publication form on-line - on-line Language eng - English Country NL - Netherlands Keywords Melt strength ; Metallocene polypropylene ; Elongational viscosity Subject RIV BK - Fluid Dynamics R&D Projects IAA200600703 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000263008600001 DOI 10.1016/j.jnnfm.2008.06.001 Annotation There is compared 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 rheological description in different flow situations the eXtended Pom-Pom (XPP) and PTT-XPP models were used. A rotational rheometer (ARES 2000) with the SER Universal Testing Platform were used for the measurement of dynamic data and uniaxial extensional viscosity. It was shown that both processed mPPs (with and without peroxide) exhibit distinct behavior in uniaxial extensional viscosity 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. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2009
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