使用平行压力反应器的乙烯聚合反应及链转移聚合的动力学分析
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization.
作者信息
Hue Ryan J, Tonks Ian A
机构信息
Department of Chemistry, University of Minnesota - Twin Cities.
Department of Chemistry, University of Minnesota - Twin Cities;
出版信息
J Vis Exp. 2015 Nov 27(105):53212. doi: 10.3791/53212.
We demonstrate a method for high-throughput catalyst screening using a parallel pressure reactor starting from the initial synthesis of a nickel α-diimine ethylene polymerization catalyst. Initial polymerizations with the catalyst lead to optimized reaction conditions, including catalyst concentration, ethylene pressure and reaction time. Using gas-uptake data for these reactions, a procedure to calculate the initial rate of propagation (kp) is presented. Using the optimized conditions, the ability of the nickel α-diimine polymerization catalyst to undergo chain transfer with diethylzinc (ZnEt2) during ethylene polymerization was investigated. A procedure to assess the ability of the catalyst to undergo chain transfer (from molecular weight and C NMR data), calculate the degree of chain transfer, and calculate chain transfer rates (ke) is presented.
我们展示了一种使用平行压力反应器进行高通量催化剂筛选的方法，该方法从镍α-二亚胺乙烯聚合催化剂的初始合成开始。用该催化剂进行的初始聚合反应得出了优化的反应条件，包括催化剂浓度、乙烯压力和反应时间。利用这些反应的气体吸收数据，给出了一种计算初始增长速率（kp）的程序。在优化条件下，研究了镍α-二亚胺聚合催化剂在乙烯聚合过程中与二乙基锌（ZnEt2）发生链转移的能力。给出了一种评估催化剂进行链转移的能力（根据分子量和碳核磁共振数据）、计算链转移度以及计算链转移速率（ke）的程序。
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