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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.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
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