화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.18, No.7, 695-700, July, 2010
DOI10.1007/s13233-010-0709-4  Export Citation
A New Method of Active Center Determination for Olefin Polymerization with Supported Ziegler-Natta Catalysts
Letian Zhang1, Zhisheng Fu1, and Zhiqiang Fan1, 2, †
  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China
  • 2The State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou, 310027, China
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A novel method based on a reaction between the growing polymer chain and cinnamoyl chloride (CC) was developed to determine the number of active centers (Cp) in olefin polymerization with supported Ziegler-Natta catalysts. The reaction of titanium-polymeryl bonds in the active centers of MgCl2/ID/TiCl4-AlR3 type catalysts with CC was very fast at 20~80 ℃. Cinnamoyl labeled polymer chains were formed, which were stable in the reaction system for at least 10 min when the CC/Al molar ratio was > 1. The number of active centers was determined by measuring the number of carbonyl groups in the polymer with the UV-vis method. The Cp values of the 1-hexene polymerization systems with the addition of hydrogen were also measured.
Keywords:Ziegler-Natta polymerization;catalysts;active centers;measurement method
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