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  • 08월 28일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Polymerization Properties of Dinuclear Metallocenes

2008년 8월 27일 10시 45분 43초
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무기ㆍ고분자공동 - Next Generation Polyolefins with the Application of Organometallic Catalysts Ⅱ: 폴리올레핀 국제공동심포지움
저자 및
영남대학교 공업화학과, Korea
For the effort to design a new kind of metallocene catalyst the development of dinuclear metallocenes was attempted since the dinuclear compounds could provide extra diversity on catalysis due to the presence of bridging ligand as an additional variable to tune metallocene character along with Cp’, central metal and anion. It has been demonstrated by the considerable influence observed on catalytic properties according to the change of the structure of dinuclear metallocene. Here in we review the development of dinuclear metallocene that has been exploited. Particularly the relation between polymerization properties and the structure of the bridging ligand is going to be described. It found that the dinuclear half-titanocenes with the rigid bridge exhibited higher activity than those with the flexible bridge. Among the flexible bridged dinuclear metallocenes the catalyst with longer bridge displayed grater activity. The most important advantage of the dinuclear half-titanocenes over the normal mononuclear half-titanocenes was that the former ones were able to make SPS with higher syndiotacticity. In case of dinuclear CGC it also has been observed that the nature of the bridge was the important factor to lead to the catalytic activity, copolymerizability, and molecular weight of the polymer.