| 摘要 |
An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'1R'2R'3R'4 or TiR'1R'2R'3, wherein R'1, R'2, R'3, and R'4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by the following formula: wherein R1, R2, R3, R4 and R5 can be, independently, alkyl group, aryl group, silyl group, germanyl group, stannyl group, hydrogen atom, or halogen atom; R is an alkyl group, aryl group, hydrogen atom, or halogen atom; and X can be one of the Group IVA elements of silicon (Si), germanium (Ge), or tin (Sn); and (c) an activated transitional metal co-catalyst, which can be methyl aluminoxane, or a mixture containing a non-coordinated Lewis acid (a Lewis acid is an electron-pair donor) and a trialkyl aluminum, such as triethyl aluminum or tetraisobutyl aluminum. R1 and R2 and R3 and R4, respectively, can also be part of a benzene ring.
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