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Rheological behaviour of polypropylene blends utilized in foaming process
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SYSNO ASEP 0361355 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Rheological behaviour of polypropylene blends utilized in foaming process Tvůrce(i) Piyamanocha, P. (CZ)
Sedláček, T. (CZ)
Polášková, M. (CZ)
Filip, Petr (UH-J) ORCID, RID, SAI
Sáha, P. (CZ)Zdroj.dok. Latest Trends on Engineering Mechanics, Structures, Engineering Geology. - Athens : WSEAS, 2010 / Martin O. ; Zheng X. - ISSN 1792-4294 - ISBN 978-960-474-203-5 Rozsah stran s. 275-278 Poč.str. 4 s. Forma vydání CD-ROM - CD-ROM Akce WSEAS International Conference on Engineering Mechanics, Structures, Engineering Geology /3./ (EMESEG '10), International Conference on Geography and Geology 2010 (WORLDGEO '10) Datum konání 22.07.2010-24.07.2010 Místo konání Corfu Země GR - Řecko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GR - Řecko Klíč. slova polypropylene foam ; rheology ; strain hardening ; foam morphology ; pressure dependent viscosity Vědní obor RIV BK - Mechanika tekutin CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000288686900053 Anotace Morphological structure of PP foams represented by the size of the bubbles and bubbles density is affected by rheological properties of the source materials. Various blends of high molecular weight and high melt strength PP were prepared in a twin screw extruder, and foamed. Their shear flow behavior as well as strain hardening during elongation were found to be the factors of a key importance in foaming process optimization. Pressure dependent shear flow behavior of the tested materials was determined using capillary rheometer modified with backpressure chamber, and obtained dependencies of shear viscosity on pressure conditions were analyzed in order to further tailor blend compositions regarding their following use in foaming processes. It has been demonstrated that foam morphology might be controlled not only through degree of bubble coalescence and nucleation rate by the help of optimizing of material components ratio, but also via setting the proper processing conditions. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2012
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