DC Field | Value | Language |
---|---|---|
dc.contributor.author | Li, Sheng | ko |
dc.contributor.author | Register, Richard A. | ko |
dc.contributor.author | Weinhold, Jeffrey D. | ko |
dc.contributor.author | Landes, Brian G. | ko |
dc.date.accessioned | 2016-05-16T04:33:51Z | - |
dc.date.available | 2016-05-16T04:33:51Z | - |
dc.date.created | 2016-02-03 | - |
dc.date.created | 2016-02-03 | - |
dc.date.created | 2016-02-03 | - |
dc.date.issued | 2012-07 | - |
dc.identifier.citation | MACROMOLECULES, v.45, no.14, pp.5773 - 5781 | - |
dc.identifier.issn | 0024-9297 | - |
dc.identifier.uri | http://hdl.handle.net/10203/207382 | - |
dc.description.abstract | Crystallization 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.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | OLEFIN BLOCK-COPOLYMERS | - |
dc.subject | X-RAY-SCATTERING | - |
dc.subject | SEMICRYSTALLINE DIBLOCK COPOLYMERS | - |
dc.subject | GEL-PERMEATION CHROMATOGRAPHY | - |
dc.subject | ABA TRIBLOCK COPOLYMERS | - |
dc.subject | MOLECULAR-WEIGHT | - |
dc.subject | VISCOELASTIC PROPERTIES | - |
dc.subject | LAMELLAR MICRODOMAINS | - |
dc.subject | MICROPHASE-SEPARATION | - |
dc.subject | MECHANICAL-PROPERTIES | - |
dc.title | Melt and Solid-State Structures of Polydisperse Polyolefin Multiblock Copolymers | - |
dc.type | Article | - |
dc.identifier.wosid | 000306674300017 | - |
dc.identifier.scopusid | 2-s2.0-84864237727 | - |
dc.type.rims | ART | - |
dc.citation.volume | 45 | - |
dc.citation.issue | 14 | - |
dc.citation.beginningpage | 5773 | - |
dc.citation.endingpage | 5781 | - |
dc.citation.publicationname | MACROMOLECULES | - |
dc.identifier.doi | 10.1021/ma300910m | - |
dc.contributor.localauthor | Li, Sheng | - |
dc.contributor.nonIdAuthor | Register, Richard A. | - |
dc.contributor.nonIdAuthor | Weinhold, Jeffrey D. | - |
dc.contributor.nonIdAuthor | Landes, Brian G. | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | OLEFIN BLOCK-COPOLYMERS | - |
dc.subject.keywordPlus | X-RAY-SCATTERING | - |
dc.subject.keywordPlus | SEMICRYSTALLINE DIBLOCK COPOLYMERS | - |
dc.subject.keywordPlus | GEL-PERMEATION CHROMATOGRAPHY | - |
dc.subject.keywordPlus | ABA TRIBLOCK COPOLYMERS | - |
dc.subject.keywordPlus | MOLECULAR-WEIGHT | - |
dc.subject.keywordPlus | VISCOELASTIC PROPERTIES | - |
dc.subject.keywordPlus | LAMELLAR MICRODOMAINS | - |
dc.subject.keywordPlus | MICROPHASE-SEPARATION | - |
dc.subject.keywordPlus | MECHANICAL-PROPERTIES | - |
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