Macromolecular Research, Vol.18, No.8, 737-741, August, 2010
Synthesis of Stereoblock Polypropylene by Change of Temperature in Living Polymerization
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[t-BuNSiMe2(3,6-t-Bu2Flu)]TiMe2 (1) combined with trialkylaluminum-free modified methylaluminoxane (dMMAO) was used to induce the living polymerization of propylene in toluene at -20, 0, and 25 ℃ with control of the syndiospecificity. After the first polymerization at -20 ℃, the same amounts of propylene were added at 25 ℃ for the second polymerization. The resulting PP was syndiotactic-rich (rr = 0.75), the value of which is the arithmetical average ((0.89 + 0.60)/2 = 0.745) of those produced at -20 and 25 ℃. These results indicate the formation of the
expected syndiotactic-atactic di-stereoblock PP.
Keywords:stereoblock PP;living polymerization
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