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On row-structures in sheared polypropylene and a propylene–ethylene copolymer

2014-04Artigo científico Acesso restrito
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datacite.subject.sdg03:Saúde de Qualidade
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorOlley, Robert H.
dc.contributor.authorMitchell, Geoffrey R.
dc.contributor.authorMoghaddam, Yasmin
dc.date.accessioned2026-06-02T08:40:07Z
dc.date.available2026-06-02T08:40:07Z
dc.date.issued2014-04
dc.description.abstractThe crystallisation of polymers such as polyethylene or polypropylene from the melt is greatly influenced by the flow-thermal history prior to the crystallisation. We explore the influence of the chemical configuration of polypropylene based chains on the formation of row structures on crystallisation. We use a combination of in situ time resolved smallangle X-ray scattering, ex situ wide angle X-ray scattering with optical and scanning electron microscopy to show that row nuclei are formed in random copolymers of propylene with a limited amount of ethylene subjected to modest shear flow fields. We contrast observations performed using two homopolymers of isotactic polypropylene and one random copolymer of propylene and ethylene. We propose that it is not strictly necessary to argue that the row nuclei are already crystalline nor to invoke epitaxial crystallisation as the mechanism for the nucleation of lamellae, as similar structures can be formed on carbon nanotubes and fibrils of dibenzylidene sorbitol. The combination of microscopy and scattering provides a powerful approach to investigating these phenomena, especially as compared to either technique used in isolation.eng
dc.description.sponsorshipThe synchrotron based studies were performed at the STFC Daresbury Synchrotron on beam-line 16.1 and we thank Anthony Gleeson for his help with the beam-line. The polymers were provided by Borealis Ltd. The electron microscopy was performed in the Centre for Advanced Microscopy at the University of Reading.
dc.identifier.citationRobert H. Olley, Geoffrey R. Mitchell, Yasmin Moghaddam, On row-structures in sheared polypropylene and a propylene–ethylene copolymer, European Polymer Journal, Volume 53, 2014, Pages 37-49, ISSN 0014-3057, https://doi.org/10.1016/j.eurpolymj.2014.01.010
dc.identifier.doi10.1016/j.eurpolymj.2014.01.010
dc.identifier.issn0014-3057
dc.identifier.urihttp://hdl.handle.net/10400.8/16371
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier BV
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0014305714000202
dc.relation.ispartofEuropean Polymer Journal
dc.rights.uriN/A
dc.subjectPolypropylene
dc.subjectCopolymer
dc.subjectNucleation
dc.subjectSEM (scanning electron microscopy)
dc.subjectWAXS (wide-angle X-ray scattering)
dc.subjectSAXS (small-angle X-ray scattering)
dc.titleOn row-structures in sheared polypropylene and a propylene–ethylene copolymereng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage49
oaire.citation.startPage37
oaire.citation.titleEuropean Polymer Journal
oaire.citation.volume53
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameMitchell
person.givenNameGeoffrey
person.identifier166356
person.identifier.ciencia-idE41A-ABDD-1FC7
person.identifier.orcid0000-0001-7977-7610
person.identifier.scopus-author-id7403103397
relation.isAuthorOfPublication48c8066b-023e-4405-b462-49d28af000d1
relation.isAuthorOfPublication.latestForDiscovery48c8066b-023e-4405-b462-49d28af000d1

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