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Long-chain branched polypropylene: crystallization under high pressure and polymorphic composition

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dc.title Long-chain branched polypropylene: crystallization under high pressure and polymorphic composition en
dc.contributor.author Navrátilová, Jana
dc.contributor.author Gajzlerová, Lenka
dc.contributor.author Kovář, Lukáš
dc.contributor.author Čermák, Roman
dc.relation.ispartof Journal of Thermal Analysis and Calorimetry
dc.identifier.issn 1388-6150 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2021
utb.relation.volume 143
dc.citation.spage 3377
dc.citation.epage 3383
dc.type article
dc.language.iso en
dc.publisher Springer Netherlands
dc.identifier.doi 10.1007/s10973-020-09931-1
dc.relation.uri https://link.springer.com/article/10.1007/s10973-020-09931-1
dc.subject Crystallization under high pressure en
dc.subject Long-chain branched polypropylene en
dc.subject Polymorphism en
dc.subject Thermal properties en
dc.description.abstract High-pressure crystallization and resulting polymorphic composition of long-chain branched polypropylene (LCB-PP) were studied and compared with common linear isotactic polypropylene (PP). Commercially available LCB-PP and PP with similar melt flow indexes were crystallized under several high pressures (20, 40, 80, 120 and 160 MPa) at constant cooling rate 5 °C min−1. Structure of crystallized samples was evaluated via wide-angle X-ray scattering, differential scanning calorimetry and scanning electron microscopy. It was shown that under low pressure LCB-PP crystallizes at higher crystallization temperature than PP due to its higher nucleating density. The opposite situation is observed at high pressures (120 and 160 MPa): crystallization temperature of PP exceeds that of LCB-PP as a negative effect of branching is pronounced. Polymorphic analysis proved that LCB-PP tends to crystallize into orthorhombic γ-form. This crystalline form becomes to be dominant at 40 MPa, and LCB-PP samples crystallized at 120 and 160 MPa contain solely γ-form. On the other hand, no pure γ-form sample was prepared from PP in this study, although positive effect of pressure on its formation is observed. Thermodynamic stability of LCB-PP crystalline structure is systematically lower compared to PP. With pronounced crystallization pressure, the melting peak broadens and finally splits, indicating the presence of dominant amount of γ-form in LCB-PP. In comparison with PP, crystallites in LCB-PP structure are considerably smaller due to lower crystal growth rate and higher nucleating density. © 2020, Akadémiai Kiadó, Budapest, Hungary. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1009780
utb.identifier.obdid 43881614
utb.identifier.scopus 2-s2.0-85086643216
utb.identifier.wok 000552776500006
utb.identifier.coden JTACF
utb.source j-scopus
dc.date.accessioned 2020-07-10T13:51:21Z
dc.date.available 2020-07-10T13:51:21Z
utb.contributor.internalauthor Navrátilová, Jana
utb.contributor.internalauthor Gajzlerová, Lenka
utb.contributor.internalauthor Kovář, Lukáš
utb.contributor.internalauthor Čermák, Roman
utb.fulltext.affiliation Jana Navratilova 1, Lenka Gajzlerova 1, Lukas Kovar 1, Roman Cermak 1 1 Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic
utb.fulltext.dates Received: 20 December 2018 Accepted: 10 June 2020
utb.wos.affiliation [Navratilova, Jana; Gajzlerova, Lenka; Kovar, Lukas; Cermak, Roman] Tomas Bata Univ Zlin, Fac Technol, Vavreckova 275, Zlin 76001, Czech Republic
utb.scopus.affiliation Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, Zlin, 760 01, Czech Republic
utb.fulltext.faculty Faculty of Technology
utb.fulltext.faculty Faculty of Technology
utb.fulltext.faculty Faculty of Technology
utb.fulltext.faculty Faculty of Technology
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