Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (4): 653.

• Articles • Previous Articles     Next Articles

Effect of Butylmagnesium on Polymerization of Styrene with Calixarene Neodymium/Butylmagnesium-HMPA Catalyst System

ZHENG Yan-Song1, SHEN Zhi-Quan2   

  1. 1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Institute of Polymer Sciences and Materials, Zhejiang University, Hangzhou 310027, China
  • Received:1999-03-05 Online:2000-04-24 Published:2000-04-24

Abstract: The polymerization of styrene was initiated by calixarene neodymium/di-n-butylmagnesium/hexamethylphosphoramide catalyst system. The average viscosity molecular weight of polystyrene increases as the concentration of di n butylmagnesium or the Mg/Al molar ratio in the di-n-butylmagnesium increases. This result was explained by the state of association of butylmagnesium. As the state of association of di-n-butylmagnesium increases, the average viscosity molecular weight of polystyrene increases.

Key words: Calixarene-neodymium complex, State of association of di-n-butylmagnesium, Styrene, Polymerization

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