Melt and Solid-State Structures of Polydisperse Polyolefin Multiblock Copolymers

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dc.contributor.authorLi, Shengko
dc.contributor.authorRegister, Richard A.ko
dc.contributor.authorWeinhold, Jeffrey D.ko
dc.contributor.authorLandes, Brian G.ko
dc.date.accessioned2016-05-16T04:33:51Z-
dc.date.available2016-05-16T04:33:51Z-
dc.date.created2016-02-03-
dc.date.created2016-02-03-
dc.date.created2016-02-03-
dc.date.issued2012-07-
dc.identifier.citationMACROMOLECULES, v.45, no.14, pp.5773 - 5781-
dc.identifier.issn0024-9297-
dc.identifier.urihttp://hdl.handle.net/10203/207382-
dc.description.abstractCrystallization in polydisperse ethylene octene multiblock copolymers, polymerized via chain shuttling chemistry, is examined using two-dimensional synchrotron small- and wide-angle X-ray scattering on flow-aligned specimens. The multiblocks are composed of alternating crystalline (hard) blocks of low 1-octene content and amorphous (soft) blocks of high 1-octene content; the block lengths and the number of blocks per chain are characterized by most-probable distributions. These polymers self-assemble into lamellar domain morphologies in the melt, and the melt morphology is retained in the solid state. Despite extensive mixing between hard and soft blocks, the high crystallinity (>50%) of the hard blocks leads to an alignment of the crystallites within the domain structure, with the orthorhombic polyethylene c-axis generally perpendicular to the lamellar domain normal. The interlamellar domain spacings exhibited by the multiblocks, which exceed 100 nm, are estimated to be 5 times larger than those in near-monodisperse block copolymers having a similar chemical composition and a number-average molecular weight equivalent to the multiblock's "constituent diblock" repeating unit. This swelling factor exceeds the value of 3 previously reported for analogous polydisperse olefin diblock copolymers, due to the lower segregation strength and enhanced phase mixing of the multiblocks studied here.-
dc.languageEnglish-
dc.publisherAMER CHEMICAL SOC-
dc.subjectOLEFIN BLOCK-COPOLYMERS-
dc.subjectX-RAY-SCATTERING-
dc.subjectSEMICRYSTALLINE DIBLOCK COPOLYMERS-
dc.subjectGEL-PERMEATION CHROMATOGRAPHY-
dc.subjectABA TRIBLOCK COPOLYMERS-
dc.subjectMOLECULAR-WEIGHT-
dc.subjectVISCOELASTIC PROPERTIES-
dc.subjectLAMELLAR MICRODOMAINS-
dc.subjectMICROPHASE-SEPARATION-
dc.subjectMECHANICAL-PROPERTIES-
dc.titleMelt and Solid-State Structures of Polydisperse Polyolefin Multiblock Copolymers-
dc.typeArticle-
dc.identifier.wosid000306674300017-
dc.identifier.scopusid2-s2.0-84864237727-
dc.type.rimsART-
dc.citation.volume45-
dc.citation.issue14-
dc.citation.beginningpage5773-
dc.citation.endingpage5781-
dc.citation.publicationnameMACROMOLECULES-
dc.identifier.doi10.1021/ma300910m-
dc.contributor.localauthorLi, Sheng-
dc.contributor.nonIdAuthorRegister, Richard A.-
dc.contributor.nonIdAuthorWeinhold, Jeffrey D.-
dc.contributor.nonIdAuthorLandes, Brian G.-
dc.type.journalArticleArticle-
dc.subject.keywordPlusOLEFIN BLOCK-COPOLYMERS-
dc.subject.keywordPlusX-RAY-SCATTERING-
dc.subject.keywordPlusSEMICRYSTALLINE DIBLOCK COPOLYMERS-
dc.subject.keywordPlusGEL-PERMEATION CHROMATOGRAPHY-
dc.subject.keywordPlusABA TRIBLOCK COPOLYMERS-
dc.subject.keywordPlusMOLECULAR-WEIGHT-
dc.subject.keywordPlusVISCOELASTIC PROPERTIES-
dc.subject.keywordPlusLAMELLAR MICRODOMAINS-
dc.subject.keywordPlusMICROPHASE-SEPARATION-
dc.subject.keywordPlusMECHANICAL-PROPERTIES-
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