DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chu, Kyung-Jun | ko |
dc.contributor.author | Soares, Joao B. P. | ko |
dc.contributor.author | Penlidis, Alexander | ko |
dc.contributor.author | Ihm, Son Ki | ko |
dc.date.accessioned | 2008-03-28T09:39:03Z | - |
dc.date.available | 2008-03-28T09:39:03Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1999-06 | - |
dc.identifier.citation | MACROMOLECULAR CHEMISTRY AND PHYSICS, v.200, no.6, pp.1298 - 1305 | - |
dc.identifier.issn | 1022-1352 | - |
dc.identifier.uri | http://hdl.handle.net/10203/3543 | - |
dc.description.abstract | Copolymerization of ethylene and 1-hexene was carried out with catalysts having isolated Ti3+ and multinuclear Ti3+ species. Carbon-13 nuclear magnetic resonance spectroscopy (C-13 NMR), crystallization analysis fractionation (CRYSTAF), and gel permeation chromatography (GPC) studies showed that the microstructure of ethylene and 1-hexene copolymers strongly depends upon the structure of the Ti3+ species. Isolated Ti3+ species increase the relative reactivity of ethylene in copolymerizations and produce copolymers with high molecular weight and broad short chain branching distribution (SCBD), with a large ethylene-rich fraction. Multinuclear Ti3+ species increase the relative reactivity of 1-hexene and produce copolymers with low molecular weight and broad SCBD, with a large rubbery ethylene/1-hexene fraction. Comparative studies of the copolymer microstructure from isolated Ti3+ and multinuclear Ti3+ in combination with different cocatalysts, Al(CH3)(3), Al(C2H5)(3), and methylaluminoxane (MAO) were also carried out. isolated Ti3+ species in combination with MAO cause remarkable changes in the 1-hexene incorporation rate and SCBD in comparison with Al(CH3)(3) and Al(C2H5)(3), while multinuclear Ti3+ species in combination with MAO do not affect as much the 1-hexene incorporation rate. This difference may be related to the mechanism of active site formation between the different Ti3+ structures and MAO. | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | Wiley-Blackwell | - |
dc.subject | ZIEGLER-NATTA CATALYSTS | - |
dc.subject | CRYSTALLIZATION ANALYSIS FRACTIONATION | - |
dc.subject | OLEFIN COPOLYMERIZATION | - |
dc.subject | POLYMERIZATION | - |
dc.subject | POLYOLEFINS | - |
dc.title | The influence of the Ti3+ species on the microstructure of ethylene/1-hexene copolymers | - |
dc.type | Article | - |
dc.identifier.wosid | 000080688600007 | - |
dc.identifier.scopusid | 2-s2.0-18944401225 | - |
dc.type.rims | ART | - |
dc.citation.volume | 200 | - |
dc.citation.issue | 6 | - |
dc.citation.beginningpage | 1298 | - |
dc.citation.endingpage | 1305 | - |
dc.citation.publicationname | MACROMOLECULAR CHEMISTRY AND PHYSICS | - |
dc.identifier.doi | 10.1002/(SICI)1521-3935(19990601)200:6<1298::AID-MACP1298>3.3.CO;2-8 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Ihm, Son Ki | - |
dc.contributor.nonIdAuthor | Chu, Kyung-Jun | - |
dc.contributor.nonIdAuthor | Soares, Joao B. P. | - |
dc.contributor.nonIdAuthor | Penlidis, Alexander | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | ZIEGLER-NATTA CATALYSTS | - |
dc.subject.keywordPlus | CRYSTALLIZATION ANALYSIS FRACTIONATION | - |
dc.subject.keywordPlus | OLEFIN COPOLYMERIZATION | - |
dc.subject.keywordPlus | POLYMERIZATION | - |
dc.subject.keywordPlus | POLYOLEFINS | - |
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