Abstract
Abstract The styrene polymerization was carried out with different kinds of homogeneous titanium compounds. The structure of polymers was investigated with 13 C-NMR (nuclear magnetic resonance) spectroscopy, DSC (differential scanning calorimeter) and GPC (gel permeation chromatography). The molecular weight distribution (MWD) of polystyrenes from none-cyclopentadienyl titanium catalysts depended on the aluminoxane/transition metal (Al/Ti) mole ratio and the shape of the MWD was bimodal. Whereas, MWD of polystyrenes from a monocyclopentadienyl titanium catalyst did not depend on the Al/Ti mole ratio and the shape of the MWD was unimodal. From the above results, the MWD of polystyrene depended on the kinds of catalyst and/or the interaction between transition metal and aluminoxane.
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