Precise control of microstructure of functionalized polypropylene synthesized by the ansa-zirconocene/ MAO catalysts

We inclusively investigated polymerization behavior and structure of copolymer in the copolymerization of propylene and alkylaluminum-protected polar allyl monomers. The control of the arrangement of polar group in the copolymer was discussed. It was proved that the location of polar group could be...

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Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2008-03, Vol.46 (5), p.1738-1748
Main Authors: Hagihara, Hideaki, Ishihara, Takeshi, The Ban, Hoang, Shiono, Takeshi
Format: Article
Language:English
Subjects:
Applied sciences
Copolymerization
Exact sciences and technology
functionalization of polymers
isotactic
metallocene catalysts
Organic polymers
Physicochemistry of polymers
poly(propylene)
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:We inclusively investigated polymerization behavior and structure of copolymer in the copolymerization of propylene and alkylaluminum-protected polar allyl monomers. The control of the arrangement of polar group in the copolymer was discussed. It was proved that the location of polar group could be controlled by zirconocene catalyst and a kind of polar monomer. The indenyl or the 2-methylindenyl ligands of zirconocene were favored to produce end-functionalized polymers. It was also found that the trimethylaluminum-protected allylamine and triisobutylaluminum-protected allylmercaptan had superior ability in the synthesis of end-functionalized polypropylene. On the other hand, the 2-methyl-4-phenylindenyl ligand produced the copolymers containing both the end-polar unit and inner-polar unit at the polymer chains. Terpolymerization of propylene, polar allyl monomer, and 5-hexen-1-ol was also conducted. The NMR study of the terpolymer revealed that both the 5-hexen-1-ol and the polar allyl monomer were incorporated into the polymer chain. It has also become apparent that the polar allyl monomer units predominantly occupied the chain end, while the 5-hexen-1-ol units were located at the inner of main chain. Consequently, we have achieved the synthesis of functionalized polypropylene in which the arrangement of polar group was precisely controlled. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1738-1748, 2008
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.22516