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Injection-moulded alpha- and beta-polypropylenes: II. Tensile properties vs. processing parameters

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dc.title Injection-moulded alpha- and beta-polypropylenes: II. Tensile properties vs. processing parameters en
dc.contributor.author Čermák, Roman
dc.contributor.author Obadal, Martin
dc.contributor.author Ponížil, Petr
dc.contributor.author Polášková, Martina
dc.contributor.author Stoklasa, Karel
dc.contributor.author Hečková, Jitka
dc.relation.ispartof European Polymer Journal
dc.identifier.issn 0014-3057 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2006-09
utb.relation.volume 42
utb.relation.issue 9
dc.citation.spage 2185
dc.citation.epage 2191
dc.type article
dc.language.iso en
dc.publisher Pergamon Elsevier Science Ltd. en
dc.identifier.doi 10.1016/j.eurpolymj.2006.03.014
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0014305706000991
dc.subject polypropylene en
dc.subject tensile behaviour en
dc.subject alpha-form en
dc.subject beta-form en
dc.subject specific nucleation en
dc.subject processing parameters en
dc.description.abstract Resuming our comprehensive study, present Part II directs attention towards the effects of mould temperature and holding pressure on the tensile properties of neat and beta-nucleated isotactic polypropylenes. A commercial-grade of isotactic polypropylene was modified with a beta-specific nucleator. From both the original material (alpha-iPP) and the beta-nucleated material (beta-iPP), tensile test specimens were injection-moulded. Stress-strain measurements performed at room temperature revealed a positive influence of higher mould temperatures but negligible effect of holding pressure on the elastic modulus of injection-moulded specimens. It was suggested that at optimum processing conditions the elastic modulus of both alpha- and beta-iPP may be comparable. The softening effect of beta-form manifested itself in systematically lower yield stress values of beta-iPP as compared to alpha-iPP. The yield strain of both alpha- and beta-iPP decreased with the increase of mould temperature and the decrease of holding pressure. Prolonged solidification times at higher mould temperatures negatively influenced the strain at break of the specimens; the values of beta-iPP exceeded by several folds those of alpha-iPP. The stress at break of beta-iPP decreased correspondingly to strain at break. On the contrary, the increase of strain at break in a-iPP was followed by a decrease of stress at break. (c) 2006 Elsevier Ltd. All rights reserved. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1002085
utb.identifier.obdid 43865421
utb.identifier.scopus 2-s2.0-33746754644
utb.identifier.wok 000241091300028
utb.source j-wok
dc.date.accessioned 2011-08-16T15:06:26Z
dc.date.available 2011-08-16T15:06:26Z
utb.contributor.internalauthor Čermák, Roman
utb.contributor.internalauthor Obadal, Martin
utb.contributor.internalauthor Ponížil, Petr
utb.contributor.internalauthor Polášková, Martina
utb.contributor.internalauthor Stoklasa, Karel
utb.contributor.internalauthor Hečková, Jitka
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