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Article: Conversion of growth and recrystallisation of β-phase in doped iPP

TitleConversion of growth and recrystallisation of β-phase in doped iPP
Authors
KeywordsΒ-Pp
Growth Conversion
Lower Critical Temperature
Issue Date1999
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polymer
Citation
Polymer, 1999, v. 40 n. 8, p. 2085-2088 How to Cite?
AbstractIsotactic polypropylene (iPP) was doped with pimelic acid/calcium stearate to promote the formation of the hexagonal (β) crystals during melt crystallisation. The conversion of growth pattern from the β- to the α- phase due to lowering of the crystallisation temperature was studied by a two-step crystallisation process in a DSC. The polymer melt was first allowed to crystallise isothermally at 130°C to produce almost pure β-phase and then the crystallising polymer was cooled to different temperatures between 115 and 25°C for a second-step crystallisation. It was found that the amount of α-phase was negligible after the second-step crystallisation process at 85°C or above. When the second-step crystallisation process was below 85°C, however, the amount of α-PP increased abruptly with a corresponding drop in the β-phase. This indicated that a major conversion of the β-growth to α- growth occurred near 85°C. Recrystallisation of the β-phase during heating was dependent upon the heating rate as well as the crystallisation condition of the samples.
Persistent Identifierhttp://hdl.handle.net/10722/156501
ISSN
2015 Impact Factor: 3.586
2015 SCImago Journal Rankings: 1.188
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, JXen_US
dc.contributor.authorCheung, WLen_US
dc.date.accessioned2012-08-08T08:42:42Z-
dc.date.available2012-08-08T08:42:42Z-
dc.date.issued1999en_US
dc.identifier.citationPolymer, 1999, v. 40 n. 8, p. 2085-2088en_US
dc.identifier.issn0032-3861en_US
dc.identifier.urihttp://hdl.handle.net/10722/156501-
dc.description.abstractIsotactic polypropylene (iPP) was doped with pimelic acid/calcium stearate to promote the formation of the hexagonal (β) crystals during melt crystallisation. The conversion of growth pattern from the β- to the α- phase due to lowering of the crystallisation temperature was studied by a two-step crystallisation process in a DSC. The polymer melt was first allowed to crystallise isothermally at 130°C to produce almost pure β-phase and then the crystallising polymer was cooled to different temperatures between 115 and 25°C for a second-step crystallisation. It was found that the amount of α-phase was negligible after the second-step crystallisation process at 85°C or above. When the second-step crystallisation process was below 85°C, however, the amount of α-PP increased abruptly with a corresponding drop in the β-phase. This indicated that a major conversion of the β-growth to α- growth occurred near 85°C. Recrystallisation of the β-phase during heating was dependent upon the heating rate as well as the crystallisation condition of the samples.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.subjectΒ-Ppen_US
dc.subjectGrowth Conversionen_US
dc.subjectLower Critical Temperatureen_US
dc.titleConversion of growth and recrystallisation of β-phase in doped iPPen_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.doi10.1016/S0032-3861(98)00425-Xen_US
dc.identifier.scopuseid_2-s2.0-0032599803en_US
dc.identifier.hkuros41034-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032599803&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue8en_US
dc.identifier.spage2085en_US
dc.identifier.epage2088en_US
dc.identifier.isiWOS:000078143100020-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLi, JX=7410061004en_US
dc.identifier.scopusauthoridCheung, WL=7202743084en_US

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