Polymerization of 4-n-alkylstyrenes with typical Ziegler-Natta and metallocene catalysts |
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| Authors: | Hisayuki Nakatani Koh-hei Nitta Toshikazu Takata Kazuo Soga |
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| Affiliation: | (1) Center for New Materials and School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Tatsunokuchi, Ishikawa 923-12, Japan, JP;(2) Department of Applied Chemistry, School of Engineering, Osaka Preference University, Sakai, Osaka 593, Japan, JP |
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| Abstract: | Polymerization of 4-n-alkylstyrenes (alkyl side group; methyl, ethyl, propyl and buthyl) was carried out with the η-C5(CH3)5TiCl3-methylaluminoxane (MAO) and TiCl3-triethylaluminum (TEA) catalyst systems. When the η-C5(CH3)5TiCl3-MAO catalyst was used, the stereoregularity of resulting polymers markedly depended on the length of substituted alkyl groups,
i.e., the catalyst gave highly syndiotactic poly(4-methylstyrene), but produced atactic polymers for the monomers with ethyl,
propyl and buthyl substituents. On the other hand, all the poly(4-n-alkylstyrene)s obtained with the TiCl3-TEA catalyst were highly isotactic. As a result, a large difference was observed in the thermal properties of polymers obtained
between the two catalyst systems.
Received: 6 September 1996/Accepted: 16 October 1996 |
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