Stereospecific Polymerization of Propylene
on Highly Efficient Metallocene Catalysts¹

P. M. Nedorezova*², V. I. Tsvetkova*, A. M. Aladyshev*, D. V. Savinov*,
A. N. Klyamkina*, V. A. Optov*, and D. A. Lemenovskii**

* Semenov Institute of Chemical Physics, Russian Academy of Sciences,
ul. Kosygina 4, Moscow, 117977 Russia

** Department of Chemistry, Moscow State University,
Vorob’evy gory, Moscow, 119899 Russia

Received June 1, 2000;
Revised Manuscript Received July 25, 2000

Abstract—The kinetic parameters of the synthesis of iso-, syndio-, hemiisotactic, and stereoblock PP in a liq-
uid propylene using a series of ansa-metallocenes with C₁ , C₂ , and C_s symmetries activated by methylalumin-
oxane were studied. For several metallocenes, the effect of hydrogen on the activity and molecular mass char-
acteristics of PP was assessed. The microstructure of the polymer chains, as well as the molecular mass char-
acteristics and thermal, mechanical, and optical properties of the produced polymers, were investigated.

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