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Molecules 2017, 22(5), 725;

Quasi-Living Polymerization of Propene with an Isotactic-Specific Zirconocene Catalyst

Department of Materials Chemistry and Bioengineering, National Institute of Technology, Oyama College, 771 Nakakuki, Oyama, Tochigi 323-0806, Japan
Japan Polypropylene Corporation Polymerization Technical Center 1 Toho-cho, Yokkaichi, Mie 510-0848, Japan
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
Author to whom correspondence should be addressed.
Academic Editor: Kotohiro Nomura
Received: 6 April 2017 / Revised: 24 April 2017 / Accepted: 27 April 2017 / Published: 2 May 2017
(This article belongs to the Special Issue Organometallic Catalysis for Olefin Polymerization/Oligomerization)
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Propene polymerization with isotactic (iso)-specific C2-symmetric rac-Me2Si(2-Me-Benz(e)-Ind)2ZrCl2 (1) and rac-Me2Si(2-Me-4-Ph-1-Ind)2ZrCl2 (2) were conducted under various conditions for achieving iso-specific living polymerization of propene. When Complex 1 was activated with trialkylaluminum-free modified methylaluminoxane (dMMAO) at −40 °C, the number-average molecular weight (Mn) linearly increased against the polymerization time to reach Mn = 704,000 within 15 min of polymerization, although the molecular weight distributions was broad (Mw/Mn < 3). Thus, it was found that quasi-living polymerization of propene proceeded in the 1-dMMAO system. The living nature of iso-polypropene was confirmed by the block copolymerization, where the Mn value increased from 221,000 to 382,000 after the addition of 1-octene to yield the block copolymer with a melting point of 150 °C. View Full-Text
Keywords: isotactic; 1-octene; polymerization; propene; quasi-living; zirconocene isotactic; 1-octene; polymerization; propene; quasi-living; zirconocene

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Nishii, K.; Murase, M.; Shiono, T. Quasi-Living Polymerization of Propene with an Isotactic-Specific Zirconocene Catalyst. Molecules 2017, 22, 725.

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