Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and borate
A study of 1-hexene polymerization with ethylene- bis(9-fluorenyl) hafnium dichloride has been carried out using two different cocatalyst systems, methyl-aluminoxane/trimethylaluminum (MAO/TMA) and tris-isobutyl-aluminum/ N, N-dimethylanilinium tetrakis(pentafluorophenyl) borate (TIBA/borate). When...
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| Veröffentlicht in: | European polymer journal 2009-03, Vol.45 (3), p.863-869 |
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| container_title | European polymer journal |
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| creator | Santamäki, Sanna Aitola, Erkki Kokko, Esa Repo, Timo Leskelä, Markku Seppälä, Jukka |
| description | A study of 1-hexene polymerization with ethylene-
bis(9-fluorenyl) hafnium dichloride has been carried out using two different cocatalyst systems, methyl-aluminoxane/trimethylaluminum (MAO/TMA) and
tris-isobutyl-aluminum/
N,
N-dimethylanilinium tetrakis(pentafluorophenyl) borate (TIBA/borate). When MAO/TMA was used, 1-hexene polymerized into a low molar mass poly(1-hexene) with low catalytic activity. Activation with TIBA/borate increased polymerization activity drastically as well as the molar mass of the polymers. In order to analyze differences in the activity profiles, UV–Vis spectroscopy was employed to investigate
ligand to metal charge transitions (LMCT) of the hafnocene dichloride during the activation process. The low catalytic activity and the fast chain transfer to the cocatalyst with MAO/TMA may originate from strong bonding between the metallocene cation and the MAO/TMA species thus obstructing monomer coordination and insertion. |
| doi_str_mv | 10.1016/j.eurpolymj.2008.11.027 |
| format | Article |
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bis(9-fluorenyl) hafnium dichloride has been carried out using two different cocatalyst systems, methyl-aluminoxane/trimethylaluminum (MAO/TMA) and
tris-isobutyl-aluminum/
N,
N-dimethylanilinium tetrakis(pentafluorophenyl) borate (TIBA/borate). When MAO/TMA was used, 1-hexene polymerized into a low molar mass poly(1-hexene) with low catalytic activity. Activation with TIBA/borate increased polymerization activity drastically as well as the molar mass of the polymers. In order to analyze differences in the activity profiles, UV–Vis spectroscopy was employed to investigate
ligand to metal charge transitions (LMCT) of the hafnocene dichloride during the activation process. The low catalytic activity and the fast chain transfer to the cocatalyst with MAO/TMA may originate from strong bonding between the metallocene cation and the MAO/TMA species thus obstructing monomer coordination and insertion.</description><identifier>ISSN: 0014-3057</identifier><identifier>EISSN: 1873-1945</identifier><identifier>DOI: 10.1016/j.eurpolymj.2008.11.027</identifier><identifier>CODEN: EUPJAG</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>1-Hexene ; Applied sciences ; Borate ; Exact sciences and technology ; Hafnocene ; MAO (Methyl aluminum oxane) ; Organic polymers ; Physicochemistry of polymers ; Polymerization ; Preparation, kinetics, thermodynamics, mechanism and catalysts ; UV–Vis</subject><ispartof>European polymer journal, 2009-03, Vol.45 (3), p.863-869</ispartof><rights>2008 Elsevier Ltd</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c376t-31831296fb4ba1a67655893b182f4155af7ba40c5f87dd5b438983055caeb323</citedby><cites>FETCH-LOGICAL-c376t-31831296fb4ba1a67655893b182f4155af7ba40c5f87dd5b438983055caeb323</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0014305708006654$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21285567$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Santamäki, Sanna</creatorcontrib><creatorcontrib>Aitola, Erkki</creatorcontrib><creatorcontrib>Kokko, Esa</creatorcontrib><creatorcontrib>Repo, Timo</creatorcontrib><creatorcontrib>Leskelä, Markku</creatorcontrib><creatorcontrib>Seppälä, Jukka</creatorcontrib><title>Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and borate</title><title>European polymer journal</title><description>A study of 1-hexene polymerization with ethylene-
bis(9-fluorenyl) hafnium dichloride has been carried out using two different cocatalyst systems, methyl-aluminoxane/trimethylaluminum (MAO/TMA) and
tris-isobutyl-aluminum/
N,
N-dimethylanilinium tetrakis(pentafluorophenyl) borate (TIBA/borate). When MAO/TMA was used, 1-hexene polymerized into a low molar mass poly(1-hexene) with low catalytic activity. Activation with TIBA/borate increased polymerization activity drastically as well as the molar mass of the polymers. In order to analyze differences in the activity profiles, UV–Vis spectroscopy was employed to investigate
ligand to metal charge transitions (LMCT) of the hafnocene dichloride during the activation process. The low catalytic activity and the fast chain transfer to the cocatalyst with MAO/TMA may originate from strong bonding between the metallocene cation and the MAO/TMA species thus obstructing monomer coordination and insertion.</description><subject>1-Hexene</subject><subject>Applied sciences</subject><subject>Borate</subject><subject>Exact sciences and technology</subject><subject>Hafnocene</subject><subject>MAO (Methyl aluminum oxane)</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Polymerization</subject><subject>Preparation, kinetics, thermodynamics, mechanism and catalysts</subject><subject>UV–Vis</subject><issn>0014-3057</issn><issn>1873-1945</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqFkM1O6zAQRi0EEuXnGcgGdgmeOI6dZYW49yKBYMHemjhj1VUaFzuFW56elKJuWc3mzPfNHMaugBfAob5dFrSJ69BvV8ui5FwXAAUv1RGbgVYih6aSx2zGOVS54FKdsrOUlpxzJWoxYy9zO_p3HH0YsuCyBbohWBooszhiv_2kLvvOpug_DxTkC_q_gz78uMie5s8ZDl3WhogjXbATh32iy595zl7_3L_e_csfn_8-3M0fcytUPeYCtICyqV1btQhYq1pK3YgWdOkqkBKdarHiVjqtuk62ldCNnu6XFqkVpThnN_vYdQxvG0qjWflkqe9xoLBJRgioODRiAtUetDGkFMmZdfQrjFsD3OwEmqU5CDQ7gQbATAKnzeufCkwWexdxsD4d1ksotZT1jpvvOZreffcUTbKeBkudj2RH0wX_a9cXYjqK2Q</recordid><startdate>20090301</startdate><enddate>20090301</enddate><creator>Santamäki, Sanna</creator><creator>Aitola, Erkki</creator><creator>Kokko, Esa</creator><creator>Repo, Timo</creator><creator>Leskelä, Markku</creator><creator>Seppälä, Jukka</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20090301</creationdate><title>Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and borate</title><author>Santamäki, Sanna ; Aitola, Erkki ; Kokko, Esa ; Repo, Timo ; Leskelä, Markku ; Seppälä, Jukka</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c376t-31831296fb4ba1a67655893b182f4155af7ba40c5f87dd5b438983055caeb323</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>1-Hexene</topic><topic>Applied sciences</topic><topic>Borate</topic><topic>Exact sciences and technology</topic><topic>Hafnocene</topic><topic>MAO (Methyl aluminum oxane)</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Polymerization</topic><topic>Preparation, kinetics, thermodynamics, mechanism and catalysts</topic><topic>UV–Vis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Santamäki, Sanna</creatorcontrib><creatorcontrib>Aitola, Erkki</creatorcontrib><creatorcontrib>Kokko, Esa</creatorcontrib><creatorcontrib>Repo, Timo</creatorcontrib><creatorcontrib>Leskelä, Markku</creatorcontrib><creatorcontrib>Seppälä, Jukka</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>European polymer journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Santamäki, Sanna</au><au>Aitola, Erkki</au><au>Kokko, Esa</au><au>Repo, Timo</au><au>Leskelä, Markku</au><au>Seppälä, Jukka</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and borate</atitle><jtitle>European polymer journal</jtitle><date>2009-03-01</date><risdate>2009</risdate><volume>45</volume><issue>3</issue><spage>863</spage><epage>869</epage><pages>863-869</pages><issn>0014-3057</issn><eissn>1873-1945</eissn><coden>EUPJAG</coden><abstract>A study of 1-hexene polymerization with ethylene-
bis(9-fluorenyl) hafnium dichloride has been carried out using two different cocatalyst systems, methyl-aluminoxane/trimethylaluminum (MAO/TMA) and
tris-isobutyl-aluminum/
N,
N-dimethylanilinium tetrakis(pentafluorophenyl) borate (TIBA/borate). When MAO/TMA was used, 1-hexene polymerized into a low molar mass poly(1-hexene) with low catalytic activity. Activation with TIBA/borate increased polymerization activity drastically as well as the molar mass of the polymers. In order to analyze differences in the activity profiles, UV–Vis spectroscopy was employed to investigate
ligand to metal charge transitions (LMCT) of the hafnocene dichloride during the activation process. The low catalytic activity and the fast chain transfer to the cocatalyst with MAO/TMA may originate from strong bonding between the metallocene cation and the MAO/TMA species thus obstructing monomer coordination and insertion.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.eurpolymj.2008.11.027</doi><tpages>7</tpages></addata></record> |
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| subjects | 1-Hexene Applied sciences Borate Exact sciences and technology Hafnocene MAO (Methyl aluminum oxane) Organic polymers Physicochemistry of polymers Polymerization Preparation, kinetics, thermodynamics, mechanism and catalysts UV–Vis |
| title | Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and borate |
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