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DOI: 10.1055/s-2008-1072633
Preparation of Polyethylenes End-Tethered with POSS
Contributor(s):Yasuhiro Uozumi, Yoichi M. A. Yamada, Toshihiro WatanabeLaurentian University, Canada
Homogeneous Polyhedral Oligomeric Silsesquioxane (POSS)-Supported Pd-Diimine Complex and Synthesis of Polyethylenes End-Tethered with a POSS Nanoparticle via Ethylene ”Living" Polymerization
Chem. Commun. 2008, 1178-1180
Publication History
Publication Date:
21 May 2008 (online)
Key words
polyhedral oligomeric silsesquioxane (POSS) - Pd-diimine complexes - polymerization
Significance
Preparation of a homogeneous polyhedral silsesquioxane (POSS)-supported Pd-diimine complex 3 and telechelic polyethylenes end-tethered with POSS nanoparticles 5 was reported. Thus, complex 3 was prepared by the reaction of a Pd-diimine catalyst 1 with acryloisobutyl-POSS 2 at room temperature for 48 h (40% yield). Ethylene polymerization was carried out with 3 at 5 °C under 27.5 bar in chlorobenzene followed by quenching 4 with triethylsilane to afford compound 5.
Comment
Monitoring results of 5 led to the following conclusions: The number average moleculer weight (Mn) was increased in proportion to time (1 h; 15.2 kg/mol vs 6 h; 56.4 kg/mol). The polydispersity index (PDI) value was within 1.11-1.19. 1H NMR measurements exhibited that these polymers were branched with ca. 88 branches per 1000 carbons.