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Polymer Bulletin

, Volume 39, Issue 3, pp 325–331 | Cite as

In situ activation of rac-(SBI)Zr(NMe2)2 for the polymerization of propylene

  • Il Kim
  • Richard F. Jordan
Article

Summary

Sequential NMR-scale reactions have been carried out in order to generate cationic methylzirconium complexes by the reaction of rac-(SBI)Zr(NMe2)2 (1, SBI = Me2Si(indenyl)2) with methylaluminoxane (MAO) or various noncoordinating anions such as [HNMePh2] [B(C6F5)4], [HNEt2Ph][B(C6F5)4], and [Ph3C][B(C6F5)4]. Reaction of 40 equiv. of MAO with 1 at room temperature was leaded to the formation of stable cationic methylzirconium complexes which polymerize propylene to isotactic polypropylene (iPP). For the activation of 1 with noncoordinating anions 1 was firstly methylated with 4 equiv. of AlMe3 to give rac-(SBI)ZrMe2 (2), and then 1 equiv. of noncoordinating anions was added to the resulting solution mixture containing 2 and various aluminum complexes dissolved in CD2Cl2 solvent. Complex 2 was immediately converted to cationic methylzirconium complex [rac-(SBI)Zr(μ-Me)2AlMe2]+(3), the adduct of the base-free rac-[(SBI)ZrMe]+ cation and AlMe3. Addition of small amount of liquid propylene to the NMR tube containing 3 and other byproducts was leaded to the formation of iPP showing meso pentad value of over 85 %.

Keywords

Cationic Species Isotactic Polypropylene AlMe3 Zirconocene Aluminum Complex 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  1. 1.Department of Chemical EngineeringUniversity of UlsanUlsanKorea
  2. 2.Department of ChemistryUniversity of IowaIowa CityUSA

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