Study of triisobutylaluminum as cocatalyst and processing parameters on ethylene polymerization performance of α-diimine nickel(II) complex by response surface method

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• 作者：H. Arabi ; M. S. Beheshti ; M. Yousefi ; N. Ghasemi Hamedani…
• 关键词：α ; Diimine ligands ; Ni(II) complex ; Response surface method (RSM) ; Ethylene polymerization ; Chlorine ; free alkyl aluminum
• 刊名：Polymer Bulletin
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：70
• 期：10
• 页码：2765-2781
• 全文大小：713KB
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• 作者单位：H. Arabi (1)
  M. S. Beheshti (1) (2)
  M. Yousefi (2)
  N. Ghasemi Hamedani (1) (3)
  M. Ghafelebashi (3)
  
  1. Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
  2. Department of Basic Sciences, Chemistry Group, Shahre Rey Branch, Islamic Azad University, P.O. Box 18155-144, Tehran, Iran
  3. National Petrochemical Company (NPC), Research and Technology Company, Tehran, Iran
  
• ISSN：1436-2449

文摘

In this research work, 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine-diboromonickel(II) (1) complex was synthesized and its ethylene polymerization in the presence of triisobutylaluminum (TIBA) as activator was studied. The effects of three critical factors [polymerization temperature (T), cocatalyst to catalyst ratio (CC) and pressure (P)] on the average molecular weight and crystallinity of the final polymers and also reaction yields as the response variables were evaluated with the help of empirical statistical models and visualized with the response surface method. The results show that activity of 1 as well as M w and crystallinity of the resulting polymers are influenced strongly by the polymerization factors. The activity of TIBA-activated catalyst 1 reaches a maximum at 10?°C after raising pressure and CC to 7?bar and 3,000, respectively. This activity is much higher than previously reported activity for this catalyst. Furthermore, a polymerization condition for reaching desirable responses is predicted and experimentally verified.