确定活性中心最好根据GPC数据来做。特别是生产双峰PP的时候,一定涉及到多活性中心。
有一个软件可以进行GPC数据的解析Deconvolution,自动得到活性中心的数目。如果没有软件的话,你可以参考Canada McMaster University的2篇文件,自己编写,并不是很困难的。几篇文献如下:
Soares, J.B.P. and Hamielec, A.E., "Deconvolution of Chain Length Distributions of Linear Polymers
Made by Multiple-Site-Type Catalysts", Polymer, 36, 2257-2263 (1995).
Soares, J.B.P. and Hamielec, A.E., "Effect of Reactor Residence Time Distribution of Polymer Particles
made with Heterogeneous Ziegler-Natta and Supported Metallocene Catalysts. A Generic Mathematical
Model", Macromol. Theory Simul, 4, 1085-1104 (1995).
Soares, J.B.P. and Hamielec, A.E, "General Dynamic Mathematical Modelling of Heterogeneous and
Homogeneous Ziegler-Natta Copolymerization with Multiple Site Types and Mass and Heat Transfer
Resistances", Polymer Reaction Engineering, 3, 261!324 (1995). |