Polymerization of metallocene-catalyzed long-chain branched and functional polypropylene

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Paavola, Santeri
dc.date.accessioned 2012-02-17T07:22:31Z
dc.date.available 2012-02-17T07:22:31Z
dc.date.issued 2005-12-09
dc.identifier.isbn 951-22-7957-6
dc.identifier.issn 1795-4584
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2635
dc.description.abstract Propylene was polymerized with homogeneous and heterogeneous metallocene catalysts. In addition to homopolymerizations, copolymerizations were conducted with α-olefins, dienes and functional comonomers. Propylene/1,9-decadiene copolymers were polymerized with racemic dimethylsilanylbis(2-methyl-4-phenyl-1-indenyl)zirconium dichloride supported on methylaluminoxane-modified silica. Rheological tests showed long-chain branching in the copolymers, even with comonomer incorporations of less than 1 mol %. Hydroxyl functional propylene/10-undecen-1-ol copolymers were polymerized with homogeneous racemic dimethylsilanylbis(2-methyl-4-phenyl-1-indenyl)zirconium dichloride. Addition of triisobutylaluminum eliminated the drop in molecular weight with increasing comonomer content, and the interactions between the active center and the hydroxyl group at the end of the comonomer chain were more efficiently blocked. Catalyst activity was improved by increase in the proportion of methylaluminoxane in the cocatalyst mixture. Functionality contents up to 2 mol % were obtained by lowering pressure. The functional polypropylene exhibited significantly enhanced peel strength and paintability relative to a reference homopolypropylene. Adhesion properties were improved not only in the copolymer but also in a blend consisting of propylene homopolymer and functional polypropylene, even when functionality content was only 0.17 wt %. The functional polypropylene slightly increased the adhesion between polypropylene and polyamide phase or silica filler, although the effect on impact strength was not as good as desired. In copolymerization with metallocene catalysts, the comonomer distribution is uniform along the polypropylene backbone and the stereospecificity is maintained. The properties of the polypropylene are dramatically affected even with comonomer incorporations less than 1 mol %, regardless of whether the comonomer is a non-conjugated diene to induce long-chain branching or contains a functional group to improve adhesion properties. en
dc.format.extent 61, [70]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries TKK dissertations en
dc.relation.ispartofseries 19 en
dc.relation.haspart Uusitalo, A.-M., Pakkanen, T., Kröger-Laukkanen, M., Niinistö, L., Hakala, K., Paavola, S., and Löfgren, B., Heterogenization of racemic ethylenebis(1-indenyl)zirconium dichloride on trimethylaluminum vapor modified silica surface, Journal of Molecular Catalysis A: Chemical (2000) 160 (2) 343-356. [article1.pdf] © 2000 Elsevier Science. By permission.
dc.relation.haspart Paavola, S., Saarinen, T., Löfgren, B., and Pitkänen, P., Propylene copolymerization with non-conjugated dienes and α-olefins using supported metallocene catalyst, Polymer (2004) 45 (7) 2099-2110. [article2.pdf] © 2004 Elsevier Science. By permission.
dc.relation.haspart Paavola, S., Uotila, R., Löfgren, B., and Seppälä, J. V., Enhanced adhesive properties of polypropylene through copolymerization with 10-undecen-1-ol, Reactive & Functional Polymers (2004) 61 (1) 53-62. [article3.pdf] © 2004 Elsevier Science. By permission.
dc.relation.haspart Paavola, S., Löfgren, B., and Seppälä, J. V, Polymerization of hydroxyl functional polypropylene by metallocene catalysis, European Polymer Journal (2005) 41 (12) 2861-2866. [article4.pdf] © 2005 Elsevier Science. By permission.
dc.relation.haspart Hippi, U., Korhonen, M., Paavola, S., and Seppälä, J., Compatibilization of poly(propylene)/polyamide 6 blends with functionalized poly(propylene)s prepared with metallocene catalyst, Macromolecular Materials and Engineering (2004) 289 (8) 714-721.
dc.relation.haspart Ristolainen, N., Vainio, U., Paavola, S., Torkkeli, M., Serimaa, R., and Seppälä, J., Polypropylene/organoclay nanocomposites compatibilized with hydroxyl-functional polypropylenes, Journal of Polymer Science Part B: Polymer Physics (2005) 43 (14) 1892-1903.
dc.relation.haspart Uotila, R., Hippi, U., Paavola, S., and Seppälä, J., Compatibilization of PP/elastomer/microsilica composites with functionalized polyolefins: effect on microstructure and mechanical properties, Polymer (2005) 46 (19) 7923-7930. [article7.pdf] © 2005 Elsevier Science. By permission.
dc.subject.other Chemistry en
dc.title Polymerization of metallocene-catalyzed long-chain branched and functional polypropylene en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Chemical Technology en
dc.contributor.department Kemian tekniikan osasto fi
dc.subject.keyword propylene en
dc.subject.keyword functional en
dc.subject.keyword long-chain branching en
dc.subject.keyword adhesion en
dc.subject.keyword metallocene en
dc.subject.keyword diene en
dc.subject.keyword alcohol en
dc.identifier.urn urn:nbn:fi:tkk-005954
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Polymer Technology en
dc.contributor.lab Polymeeriteknologian laboratorio fi


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