A new method of active center determination for olefin polymerization with supported Ziegler-Natta catalysts
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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 (C p ) 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 °C. 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 C p values of the 1-hexene polymerization systems with the addition of hydrogen were also measured.
KeywordsZiegler-Natta polymerization catalysts active centers measurement method
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