초록문의 abstract@kcsnet.or.kr

결제문의 member@kcsnet.or.kr

현재 가능한 작업은 아래와 같습니다.
  • 08월 18일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Development of Single-Site Catalyst for EPDM Polymerization: Synthesis and Structural Characterization of New Types of High Performance Half-Metallocene Catalysts

2011년 7월 29일 11시 00분 12초
Ⅰ-IND.P-9 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅰ>
저자 및
이희준, 김태진, 강상욱
고려대학교 소재화학과, Korea
Ligand effects on the catalytic activity [and propylene and nobornadiene incorporation] for both ethylene polymerization and ethylene/propylene/norbornadiene (EPDM) ter-polymerization using half-titanocenes (titanium half-sandwich complexes) containing 2-alkyl phenoxy ligand of type Cp’TiCl2(2-R-PhO) catalyst systems have been investigated. Cp’TiCl2(2-R-PhO) (Cp’= Cp*, R= Me (1) , iPr (2), tBu (3), Ph (4), Cp’= Ind ,R= Ph (5) , Cp’= Cp R= Ph(6) were prepared and identified; the structures of Cp*Bu, Cp*Pr and Cp*Ph, CpPh , IndPh were determined by X-ray crystallography. The metal coordination geometry of each compound is best described as pseudo-tetrahedral, with the Cp’ ring and 2-R-PhO and chloride ligands occupying three leg positions in a piano-stool geometry. The Ti?O bond length of Cp*Ph [1.784(2) ?] was similar to those found in the complex CpPh [1.782(1) ?]. The catalytic activity for EPDM ter-polymerization increased in the order: Cp*Bu [7.6 Kg/(mmol of Ti·h), in toluene, ethylene 4 atm, 80 °C, 30 sec] > Cp*Pr [7.5 Kg/(mmol of Ti·h)] > Cp*Me [6.3 Kg/(mmol of Ti·h)] > Cp*Ph [6.0 Kg/(mmol of Ti·h)], and Cp*Ph [6.0 Kg/(mmol of Ti·h)] > CpPh [5.5 Kg/(mmol of Ti·h)] > IndPh [5.3 Kg/(mmol of Ti·h)]. The effect of the cyclopentadienyl fragment and ortho substituent phenoxy ligands in the ter-polymerization of EPDM by Cp*Me?CpPh catalyst systems has been explored. The phenoxy system showed the high catalytic activity for EPDM terpolymerization, affording a high molecular weight with a unimodal molecular weight distribution and higher propylene incorporation