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dc.contributor.authorMaeda, Eduardo A.
dc.contributor.authorSantos, Alessandra F.
dc.contributor.authorSilva, Leonardo G. A.
dc.contributor.authorSchoen, Claudio G.
dc.date.accessioned2024-10-21T18:45:52Z
dc.date.available2024-10-21T18:45:52Z
dc.date.issued2016
dc.identifier.citationMater. Chem. Phys.
dc.identifier.issn1879-3312
dc.identifier.urihttp://dx.doi.org/10.1016/j.matchemphys.2015.11.027
dc.identifier.urihttps://repositorio.maua.br/handle/MAUA/1493
dc.description.abstractIsotactic Polypropylene 3 mm thick tensile samples, prepared by compression molding, were subject to electron beam irradiation with doses 0, 20, 40, 60, 100, 200 and 300 kGy. These samples were characterized by spectroscopic methods (UV spectroscopy), X-ray diffraction and mechanical tests (tensile tests and instrumented indentation), with the aim to investigate the ability of the instrumented indentation test to detect the changes in the macroscopic properties which arise from the changes in the chain structure. The use of larger irradiation doses compared with the commercial levels led to an unexpected behavior. At the smaller doses (up to 60 kGy), as expected, sample crystallinity decreases, characterizing irradiation induced amorphization. For the 100 kGy dose, however, the sample recrystallizes, returning to crystal/amorphous phase ratios similar to the ones observed for the pristine material. These changes correlated with the progressive production of -C=O and -C=C- chromophores in the chain and with a loss in yield strength and Young modulus up to 200 kGy (the sample subjected to 300 kGy is brittle). In spite of this, the indentation test showed limited sensitivity to the changes in the macroscopic tensile properties. (C) 2015 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipBrazilian National Research, Development and Innovation Council (CNPq, Brasilia, Brazil)(Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ))pt_BR
dc.description.sponsorshipCNPq
dc.format.extent7.0
dc.languageInglêspt_BR
dc.publisherELSEVIER SCIENCE SAen
dc.relation.ispartofMATERIALS CHEMISTRY AND PHYSICS
dc.rightsAcesso Restrito
dc.sourceWeb of Scienceen
dc.subjectPolymersen
dc.subjectCompactionen
dc.subjectHardnessen
dc.subjectIrradiation effectsen
dc.subjectVisible and ultraviolet spectrometersen
dc.subjectRecrystallizationen
dc.subjectIONIZING-RADIATIONen
dc.subjectDEFORMATIONen
dc.subjectPOLYAMIDE-6en
dc.subjectMICROen
dc.subjectMaterials Science, Multidisciplinaryen
dc.subject.otherPolymersen
dc.subject.otherCompactionen
dc.subject.otherHardnessen
dc.subject.otherIrradiation effectsen
dc.subject.otherVisible and ultraviolet spectrometersen
dc.subject.otherRecrystallizationen
dc.subject.otherIONIZING-RADIATIONen
dc.subject.otherDEFORMATIONen
dc.subject.otherPOLYAMIDE-6en
dc.subject.otherMICROen
dc.subject.otherMaterials Science, Multidisciplinaryen
dc.titleChemical, physical, and mechanical properties evolution in electron beam irradiated isotactic polypropyleneen
dc.typeArtigo de Periódicopt_BR
dc.identifier.doi10.1016/j.matchemphys.2015.11.027
dc.description.affiliationUniversidade Nove de Julho
dc.description.affiliationInstituto Maua de Tecnologia
dc.description.affiliationComissao Nacional de Energia Nuclear (CNEN)
dc.description.affiliationInstituto de Pesquisas Energeticas e Nucleares (IPEN)
dc.description.affiliationUniversidade de Sao Paulo
dc.identifier.wosWOS:000369679500008
dc.contributor.orcidSchon, Claudio Geraldo/0000-0001-6506-5831
dc.citation.epage61
dc.citation.spage55
dc.citation.volume169


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