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Article: On the deformation mechanisms of β-polypropylene: 1. Effect of necking on β-phase PP crystals

TitleOn the deformation mechanisms of β-polypropylene: 1. Effect of necking on β-phase PP crystals
Authors
KeywordsDeformation Mechanism
Hexagonal Polypropylene
Phase Transformation
Issue Date1998
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polymer
Citation
Polymer, 1998, v. 39 n. 26, p. 6935-6940 How to Cite?
AbstractPP samples containing β-phase crystals were prepared by doping with a β-nucleating agent. The β-PP specimens were tensile stretched at room temperature under various crosshead rates and the yielding behaviour was analyzed on the basis of Eyring's theory. After tensile testing, the β-phase was examined with WAXS and D.S.C. over the necking region and the deformation mechanisms were discussed. The β-phase was found to be mechanically stable at room temperature up to yielding point. However, once the samples were stretched to necking, the β-phase began to transform to the α-phase; this phase transformation continued over the necking region. The phase transformation implied that local melting and crystallization occurred during cold drawing and gave powerful support to Flory's model of the deformation mechanism of crystalline plastics.
Persistent Identifierhttp://hdl.handle.net/10722/156494
ISSN
2015 Impact Factor: 3.586
2015 SCImago Journal Rankings: 1.188
References

 

DC FieldValueLanguage
dc.contributor.authorLi, JXen_US
dc.contributor.authorCheung, WLen_US
dc.date.accessioned2012-08-08T08:42:40Z-
dc.date.available2012-08-08T08:42:40Z-
dc.date.issued1998en_US
dc.identifier.citationPolymer, 1998, v. 39 n. 26, p. 6935-6940en_US
dc.identifier.issn0032-3861en_US
dc.identifier.urihttp://hdl.handle.net/10722/156494-
dc.description.abstractPP samples containing β-phase crystals were prepared by doping with a β-nucleating agent. The β-PP specimens were tensile stretched at room temperature under various crosshead rates and the yielding behaviour was analyzed on the basis of Eyring's theory. After tensile testing, the β-phase was examined with WAXS and D.S.C. over the necking region and the deformation mechanisms were discussed. The β-phase was found to be mechanically stable at room temperature up to yielding point. However, once the samples were stretched to necking, the β-phase began to transform to the α-phase; this phase transformation continued over the necking region. The phase transformation implied that local melting and crystallization occurred during cold drawing and gave powerful support to Flory's model of the deformation mechanism of crystalline plastics.en_US
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polymeren_US
dc.relation.ispartofPolymeren_US
dc.rightsPolymer. Copyright © Elsevier Ltd.-
dc.subjectDeformation Mechanismen_US
dc.subjectHexagonal Polypropyleneen_US
dc.subjectPhase Transformationen_US
dc.titleOn the deformation mechanisms of β-polypropylene: 1. Effect of necking on β-phase PP crystalsen_US
dc.typeArticleen_US
dc.identifier.emailCheung, WL:wlcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, WL=rp00103en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0032428117en_US
dc.identifier.hkuros41030-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032428117&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume39en_US
dc.identifier.issue26en_US
dc.identifier.spage6935en_US
dc.identifier.epage6940en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLi, JX=7410061004en_US
dc.identifier.scopusauthoridCheung, WL=7202743084en_US

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