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The stereochemical configuration of the regioirregular unit with racemic placement included in isotactic polypropylene, which was prepared with a rac-ethylene(1-indenyl)zirconium dichloride/methylaluminoxane catalyst system at 30°C, was studied by 13C_ 1H shift correlation two-dimensional nuclear magnetic resonance spectroscopy. The stereostructure was also studied for the regioirregular unit of propylene copolymer with a small amount of ethylene units. It is concluded that the 2,1-insertion, in addition to the ordinary 1,2-insertion, of propylene monomer is also stereospecifically controlled by the catalyst.

Посилання на статтю:

Stereostructure of regioirregular unit of polypropylene obtained with rac-ethylenebis( 1 -indenyl )zirconium dichloride/ methylalurninoxane catalyst system studied by 13C-1H shift correlation two-dimensional nuclear magnetic resonance spectroscopy / Akira Mizuno*, Toshiyuki Tsutsui: and Norio Kashiwa // Polymer. – 1992. – Vol 33. – P. 254-258.

Stereostructure of regioirregular unit of polypropylene obtained with rac-ethylenebis( 1 -indenyl )zirconium dichloride/ methylalurninoxane catalyst system studied by 13C-1H shift correlation two-dimensional nuclear magnetic resonance spectroscopy - Завантажити.