The polymerization of MMA catalyzed by bridged lanthanocene amide as single compoent catalyst has been investigated. The polymers obtained were characterized by GPC, FT IR, 1H NMR and DSC. The results indicated that the conversion and the molecular weight decreased with decrease in polymerization temperature. The PMMA obtained was mainly in syndiotactic structure.
The polymerization of acrylonitrile was first studied using （C9H7）2Y（μ-Et）2AlEt2 as a single-component catalyst. The catalytic activity could be greatly increased when PhONa was added to the catalyst in amount of n（PhONa）/n（Cat）=3. A mechanism related to the polymerization initiation of AN is proposed.
