Highly 1,2 Regio- and Stereoselective Polymerization of 1,3-Butadiene Initiated by Iron Catalysts with Pyridinyl Phosphate

详细信息    查看全文

• 作者：Weijing Pan ; Huafeng Chen ; Rui Sun ; Dirong Gong ; Xiayu Jia ; Yanming Hu ; Xuequan Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：55
• 期：28
• 页码：7580-7586
• 全文大小：385K
• 年卷期：0
• ISSN：1520-5045

文摘

Three pyridinyl based compounds, diphenylpyridin-2-yl phosphate (DPPyP), phenyldipyridin-2-yl phosphate (PDPyP), and tripyridin-2-yl phosphate (TPyP), were designed, synthesized, and applied in an iron catalyst as donors for 1,2-stereopolymerization of 1,3-butadiene in hexane. In combination with AlⁱBu₃, the DPPyP assisted iron catalyst is capable of 1,2-syndiotactic polymerization (1,2-selectivity, syndiotacticity) of 1,3-butadiene with high activity reaching 258 480 kg(polymer)/mol(Fe)·h at a butadiene/Fe feeding ratio of 8000 at 50 °C. The 1,2-regioselectivity, activity, and the morphology of resultant polymers can be controlled by the donor structures. The thermal stability of the catalysts were significant because a remarkably enhanced activity was observed while the high 1,2-stereoselectivity was unaltered in the range 50–80 °C. This work enabled us to have access to a highly active, 1,2-syndiotactic and thermally robust catalyst with ease of catalyst preparation, which could match the availability in industrial application for 1,2-syndiotactic polybutadiene.