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Article: Creep behavior of biaxial cold-rolled polypropylene

TitleCreep behavior of biaxial cold-rolled polypropylene
Authors
Issue Date1995
PublisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0021-8995/
Citation
Journal Of Applied Polymer Science, 1995, v. 56 n. 8, p. 881-888 How to Cite?
AbstractPolypropylene was biaxially rolled up to 60% at ambient temperature, and the tensile creep behavior over the temperature range 27 to 60°C was investigated using a dead-load apparatus. The degrees of crystallinity of the as-molded and rolled PP were determined using a differential scanning calorimeter (DSC) and density bottle. The DSC showed a slight change in the crystallinity during the early stage of the rolling process, while the density bottle indicated a continuous drop of the density with increasing rolling reduction. The elongation due to rolling was found almost fully recoverable when the samples were thrown into hot silicon oil at 180°C. The effects of cold rolling on creep strain, secondary creep strain rate, and creep activation energy were investigated. Cold rolling led to an increase in the creep strain and secondary creep strain rate. The creep activation energy was found to increase with increasing rolling reduction. Within the secondary creep stage, the creep process in polypropylene is mainly due to the α-relaxation process and most of the creep strain was recoverable.
Persistent Identifierhttp://hdl.handle.net/10722/156423
ISSN
2015 Impact Factor: 1.866
2015 SCImago Journal Rankings: 0.578

 

DC FieldValueLanguage
dc.contributor.authorLi, JXen_US
dc.contributor.authorCheung, WLen_US
dc.date.accessioned2012-08-08T08:42:22Z-
dc.date.available2012-08-08T08:42:22Z-
dc.date.issued1995en_US
dc.identifier.citationJournal Of Applied Polymer Science, 1995, v. 56 n. 8, p. 881-888en_US
dc.identifier.issn0021-8995en_US
dc.identifier.urihttp://hdl.handle.net/10722/156423-
dc.description.abstractPolypropylene was biaxially rolled up to 60% at ambient temperature, and the tensile creep behavior over the temperature range 27 to 60°C was investigated using a dead-load apparatus. The degrees of crystallinity of the as-molded and rolled PP were determined using a differential scanning calorimeter (DSC) and density bottle. The DSC showed a slight change in the crystallinity during the early stage of the rolling process, while the density bottle indicated a continuous drop of the density with increasing rolling reduction. The elongation due to rolling was found almost fully recoverable when the samples were thrown into hot silicon oil at 180°C. The effects of cold rolling on creep strain, secondary creep strain rate, and creep activation energy were investigated. Cold rolling led to an increase in the creep strain and secondary creep strain rate. The creep activation energy was found to increase with increasing rolling reduction. Within the secondary creep stage, the creep process in polypropylene is mainly due to the α-relaxation process and most of the creep strain was recoverable.en_US
dc.languageengen_US
dc.publisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0021-8995/en_US
dc.relation.ispartofJournal of Applied Polymer Scienceen_US
dc.rightsJournal of Applied Polymer Science. Copyright © John Wiley & Sons, Inc.-
dc.titleCreep behavior of biaxial cold-rolled polypropyleneen_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-s2.0-0029308023en_US
dc.identifier.hkuros2375-
dc.identifier.volume56en_US
dc.identifier.issue8en_US
dc.identifier.spage881en_US
dc.identifier.epage888en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLi, JX=7410061004en_US
dc.identifier.scopusauthoridCheung, WL=7202743084en_US

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