DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ko, YS | ko |
dc.contributor.author | Han, TK | ko |
dc.contributor.author | Sadatoshi, H | ko |
dc.contributor.author | Woo, Seong-Ihl | ko |
dc.date.accessioned | 2019-03-06T17:30:45Z | - |
dc.date.available | 2019-03-06T17:30:45Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1998-01 | - |
dc.identifier.citation | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.36, no.2, pp.291 - 300 | - |
dc.identifier.issn | 0887-624X | - |
dc.identifier.uri | http://hdl.handle.net/10203/250702 | - |
dc.description.abstract | Thermally pretreated catalysts were prepared by heating MgCl2/THF/ TiCl4 (TT-0) at 80 degrees C for 5 min (TT-1) and 60 min (TT-2), and at 108 degrees C for 5 min (TT-3) and 60 min (TT-4). Ethylene-l-hexene copolymers were prepared with these catalysts. The TT-1 catalyst produced more blocky and higher l-hexene content polymer than TT-0, 2, 3, and 4. Temperature rising elution fractionation (TREF) analysis was used to investigate the chemical composition distribution of the ethylene-l-hexene copolymer, exhibiting. bimodal distribution for TT-0 and trimodal for TT-1, 2, 3, and 4. A portion of higher hexene content of the copolymer markedly increased when the copolymerization was performed with TT-1, indicating that copolymerization active sites were newly generated. Portion of homopolyethylene increased drastically when the copolymerization was performed with TT-4, indicating that ethylene homopolymerization active sites were increased. Gel permeation chromatography (GPC) also revealed that three kinds of active sites existed on the catalyst. C-13-NMR spectrum of each fraction after TREF analysis suggested that the isospecific active site could polymerize I-hexene well, resulting in random and alternating copolymers. A scheme for generation of the active site and change of its nature during thermal treatment of bimetallic complex catalyst is proposed. (C) 1998 John Wiley & Sons, Inc. | - |
dc.language | English | - |
dc.publisher | JOHN WILEY SONS INC | - |
dc.subject | LOW-DENSITY POLYETHYLENES | - |
dc.subject | ETHYLENE | - |
dc.subject | POLYMERIZATION | - |
dc.subject | DSC | - |
dc.title | Analysis of microstructure of ethylene-1-hexene copolymer prepared over thermally pretreated MgCl2/THF/TiCl4 bimetallic catalyst | - |
dc.type | Article | - |
dc.identifier.wosid | 000071323500012 | - |
dc.identifier.scopusid | 2-s2.0-0031648064 | - |
dc.type.rims | ART | - |
dc.citation.volume | 36 | - |
dc.citation.issue | 2 | - |
dc.citation.beginningpage | 291 | - |
dc.citation.endingpage | 300 | - |
dc.citation.publicationname | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | - |
dc.contributor.localauthor | Woo, Seong-Ihl | - |
dc.contributor.nonIdAuthor | Ko, YS | - |
dc.contributor.nonIdAuthor | Han, TK | - |
dc.contributor.nonIdAuthor | Sadatoshi, H | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | olefin polymerization | - |
dc.subject.keywordAuthor | temperature rising elution fractionation | - |
dc.subject.keywordAuthor | ethylene-1-hexene copolymer | - |
dc.subject.keywordPlus | LOW-DENSITY POLYETHYLENES | - |
dc.subject.keywordPlus | ETHYLENE | - |
dc.subject.keywordPlus | POLYMERIZATION | - |
dc.subject.keywordPlus | DSC | - |
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