Polar Isotactic and Syndiotactic Polypropylenes by Organozirconium-Catalyzed Masking-Reagent-Free Propylene and Amino–Olefin Copolymerization期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Polar Isotactic and Syndiotactic Polypropylenes by Organozirconium-Catalyzed Masking-Reagent-Free Propylene and Amino–Olefin Copolymerization

Authors:	Dr Minglu Huang Dr Jiazhen Chen Dr Binghao Wang Dr Wei Huang Dr Haibo Chen Dr Yanshan Gao Prof Tobin J Marks

Institution:	1. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA Wanhua Chemical Group Co., Ltd., Yantai, Shandong Province, 264002 P. R. China;2. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA;3. Wanhua Chemical Group Co., Ltd., Yantai, Shandong Province, 264002 P. R. China

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.

Keywords:	copolymerization monomers polymers synthetic methods zirconium