Polar Isotactic and Syndiotactic Polypropylenes by Organozirconium‐Catalyzed Masking‐Reagent‐Free Propylene and Amino–Olefin Copolymerization
Ming‐Lu Huang, Jiazhen Chen, Binghao Wang, Wei Huang, Haibo Chen, Yanshan Gao, Tobin J. Marks
Abstract
Abstract Polar functionalized isotactic and syndiotactic polypropylenes (PPs) are synthesized by direct, masking‐reagent‐free propylene and amino–olefin (AO, CH 2 =CH(CH 2 ) x N n Pr 2 , x= 2, 3, 6) copolymerizations using the activated precatalysts rac ‐[Me 2 Si(indenyl) 2 ]ZrMe 2 and [Me 2 C(Cp)(fluorenyl)]ZrMe 2 , 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.