Tri(4-methoxybenzyloxyl)(pentamethylcyclopentadienyl) titanium/Modified MAO Catalyzed Polymerization of 1-Butene

Tri(4-methoxy-1-benzyloxyl)(pentamethylcyclopentadienyl)titanium (Cp * Ti(OBzOCH3)3) in conjunction with modified methylalumoxane (mMAO) was an efficient catalyst for the living polymerization of butene-1. The steric and highly electron-releasing nature of the catalyst was probably responsible for the resulting polymers with high molecular weight and narrow molecular weight distribution (Mw/Mn=1.25 to 1.36). The effects of polymerization conditions on the catalytic activity, molecular weight and stereo-regularity of the products were investigated in detail. Especially, the content of TMA in MAO used in polymerization of butene-1 had a profound influence on polymer microstructure. The structural properties of the polybutene-1 product were characterized by 13 C NMR, GPC, DSC and WAXD. The results indicated that the polybutene-1 was isotacticity-rich (at 0 ℃, (mmmm) reached up to 60.3%) and the relative content of methylene pentad sequences (mmmm) of the polymer increased with a decreasing temperature.

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