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

ABSTRACT: Propene polymerization with isotactic (iso)-specific C?-symmetric rac-Me?Si(2-Me-Benz(e)-Ind)?ZrCl? (1) and rac-Me?Si(2-Me-4-Ph-1-Ind)?ZrCl? (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.

SUBMITTER: Nishii K 

PROVIDER: S-EPMC6154675 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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

Nishii Kei K   Murase Miyuki M   Shiono Takeshi T  

Molecules (Basel, Switzerland) 20170502 5

Propene polymerization with isotactic (<i>iso</i>)-specific <i>C</i>₂-symmetric <i>rac</i>-Me₂Si(2-Me-Benz(e)-Ind)₂ZrCl₂ (<b>1</b>) and <i>rac</i>-Me₂Si(2-Me-4-Ph-1-Ind)₂ZrCl₂ (<b>2</b>) were conducted under various conditions for achieving <i>iso</i>-specific living polymerization of propene. When Complex <b>1</b> was activated with trialkylaluminum-free modified methylaluminoxane (dMMAO) at -40 °C, the number-average molecular weight (<i>M</i><sub>n</sub>) linearly increased against the polyme  ...[more]

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