Abstract
Polar functionalized isotactic and syndiotactic polypropylenes (PPs) are synthesized by direct, masking-reagent-free propylene and amino–olefin (AO, CH2=CH(CH2)xNnPr2, x=2, 3, 6) copolymerizations using the activated precatalysts rac-[Me2Si(indenyl)2]ZrMe2 and [Me2C(Cp)(fluorenyl)]ZrMe2, respectively. Polymerization activities at 25 °C are as high as 4208 and 535 kg/(mol h atm) with AO incorporation up to 4.0 mol % and 1.6 mol %, respectively. Remarkably, introducing the amino-olefin comonomers significantly enhances stereoselection for both isotactic (mmmm: 59.5 %→91.0 %) and syndiotactic (rrrr: 66.3 %→81.3 %) products.
Original language | English |
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Pages (from-to) | 20522-20528 |
Number of pages | 7 |
Journal | Angewandte Chemie - International Edition |
Volume | 59 |
Issue number | 46 |
DOIs | |
Publication status | Published - Nov 9 2020 |
Keywords
- copolymerization
- monomers
- polymers
- synthetic methods
- zirconium
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)