Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples

Detalhes bibliográficos
Autor(a) principal: Auriemma, Finizia
Data de Publicação: 2021
Outros Autores: Ruiz de Ballesteros, Odda, Giusto, Giovangiuseppe, Di Girolamo, Rocco, Malafronte, Anna, Scoti, Miriam, De Rosa, Claudio, Mitchell, Geoffrey R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.8/8257
Resumo: The melting/crystallization properties of blends obtained by mixing two isotactic polypropylene (iPP) samples synthesized using single-site metallocene catalyst systems and containing a high and low concentration of rr triads as stereo-defects, are studied. The changes occurring at lamellar length scale during a heating/cooling cycle at constant scanning rate are followed in situ by performing time-resolved small angle X-ray scattering (SAXS) measurements. Data analysis demonstrates that the evolution of the SAXS intensity with increase/decrease of the temperature is controlled by the separate melting/crystallization of the two components, the differences in the thermal expansion (contraction) coefficient of the amorphous and crystalline phases and the role of thermal fluctuations in electron density. The two components give rise to different populations of intermixed lamellar stacks in the blends which originate from the good miscibility of the low and high stereoregular samples in the melt.
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spelling Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samplesMelt strengthPhase separationCrystalline polymersTactic polymer blendsThe melting/crystallization properties of blends obtained by mixing two isotactic polypropylene (iPP) samples synthesized using single-site metallocene catalyst systems and containing a high and low concentration of rr triads as stereo-defects, are studied. The changes occurring at lamellar length scale during a heating/cooling cycle at constant scanning rate are followed in situ by performing time-resolved small angle X-ray scattering (SAXS) measurements. Data analysis demonstrates that the evolution of the SAXS intensity with increase/decrease of the temperature is controlled by the separate melting/crystallization of the two components, the differences in the thermal expansion (contraction) coefficient of the amorphous and crystalline phases and the role of thermal fluctuations in electron density. The two components give rise to different populations of intermixed lamellar stacks in the blends which originate from the good miscibility of the low and high stereoregular samples in the melt.ScienceDirectIC-OnlineAuriemma, FiniziaRuiz de Ballesteros, OddaGiusto, GiovangiuseppeDi Girolamo, RoccoMalafronte, AnnaScoti, MiriamDe Rosa, ClaudioMitchell, Geoffrey R.2023-03-20T10:01:11Z2021-01-132021-01-13T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.8/8257engAuriemma, F., de Ballesteros, O.R., Giusto, G., Di Girolamo, R., Malafronte, A., Scoti, M., Rosa, C., Mitchell, G.R. (2021). Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples, Polymer, vol. 215, 123411, Elsevier. https://doi.org/10.1016/j.polymer.2021.1234110032-386110.1016/j.polymer.2021.123411info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-17T15:56:56Zoai:iconline.ipleiria.pt:10400.8/8257Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:51:01.481542Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
title Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
spellingShingle Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
Auriemma, Finizia
Melt strength
Phase separation
Crystalline polymers
Tactic polymer blends
title_short Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
title_full Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
title_fullStr Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
title_full_unstemmed Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
title_sort Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples
author Auriemma, Finizia
author_facet Auriemma, Finizia
Ruiz de Ballesteros, Odda
Giusto, Giovangiuseppe
Di Girolamo, Rocco
Malafronte, Anna
Scoti, Miriam
De Rosa, Claudio
Mitchell, Geoffrey R.
author_role author
author2 Ruiz de Ballesteros, Odda
Giusto, Giovangiuseppe
Di Girolamo, Rocco
Malafronte, Anna
Scoti, Miriam
De Rosa, Claudio
Mitchell, Geoffrey R.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv IC-Online
dc.contributor.author.fl_str_mv Auriemma, Finizia
Ruiz de Ballesteros, Odda
Giusto, Giovangiuseppe
Di Girolamo, Rocco
Malafronte, Anna
Scoti, Miriam
De Rosa, Claudio
Mitchell, Geoffrey R.
dc.subject.por.fl_str_mv Melt strength
Phase separation
Crystalline polymers
Tactic polymer blends
topic Melt strength
Phase separation
Crystalline polymers
Tactic polymer blends
description The melting/crystallization properties of blends obtained by mixing two isotactic polypropylene (iPP) samples synthesized using single-site metallocene catalyst systems and containing a high and low concentration of rr triads as stereo-defects, are studied. The changes occurring at lamellar length scale during a heating/cooling cycle at constant scanning rate are followed in situ by performing time-resolved small angle X-ray scattering (SAXS) measurements. Data analysis demonstrates that the evolution of the SAXS intensity with increase/decrease of the temperature is controlled by the separate melting/crystallization of the two components, the differences in the thermal expansion (contraction) coefficient of the amorphous and crystalline phases and the role of thermal fluctuations in electron density. The two components give rise to different populations of intermixed lamellar stacks in the blends which originate from the good miscibility of the low and high stereoregular samples in the melt.
publishDate 2021
dc.date.none.fl_str_mv 2021-01-13
2021-01-13T00:00:00Z
2023-03-20T10:01:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.8/8257
url http://hdl.handle.net/10400.8/8257
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Auriemma, F., de Ballesteros, O.R., Giusto, G., Di Girolamo, R., Malafronte, A., Scoti, M., Rosa, C., Mitchell, G.R. (2021). Time-resolving small angle X-Ray scattering analysis of melt crystallization of mixtures of regular and irregular isotactic polypropylene samples, Polymer, vol. 215, 123411, Elsevier. https://doi.org/10.1016/j.polymer.2021.123411
0032-3861
10.1016/j.polymer.2021.123411
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ScienceDirect
publisher.none.fl_str_mv ScienceDirect
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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