Abstract: A new catalyst composed of Tin-bridged yttrocene Ph₂Sn(MeCp)₂YCl (MeCp=methylcyclopentadienyl) and Al(i-Bu)₃ was successfully developed for the polymerization of methyl methacrylate(MMA). Detailed study of factors (such as the molar ratio of Al/Cat., catalyst concentration, various solvents, temperature and time) influencing polymerization reaction indicated that the catalytic active species may be still somewhat stable at high temperature and still have a long catalytic lifetime. ¹H NMR spectrum showed about 65% syndiotactic content in the polymethyl methacrylate(PMMA) prepared. From kinetic studies, the polymerization rate equation may be expressed as Rp=Kp[Cat.]^2.4. The overall activation energy of polymerization is 20.9±3.1 kJ/mol.

Key words: rare earth catalyst, yttrocene, heteronuclear metallocene, polymerization, methyl methacrylate, kinetics, lanthanocene

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