화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.13, No.1, 2-7, February, 2005
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Allyloxy- and Benzyloxy-Substituted Pyridine-bis-imine Iron(II) and Cobalt(II) Complexes for Ethylene Polymerization
Il Kim†, Byeong Heui Han, Jae Sung Kim, and Chang-Sik Ha
  • Department of Polymer Science and Engineering, Pusan National University, Jangjeon, Geumjeong, Busan 609-735, Korea
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A series of ethylene polymerization catalysts based on tridentate bis-imine ligands coordinated to iron and cobalt was reported. The ligands were prepared through the condensation of sterically bulky anilines with allyloxy-and benzyloxy-substituted 2,6-acetylpyridines. The pre-catalyst complexes were penta-coordinate species of the general formula {[(ArN=C(Me))2(4-RO-C5H3N)]MCl2} (Ar=ortho dialkyl-substituted aryl ring; R=allyl, benzyl; M=Fe, Co). In the presence of ethylene and methyl alumoxane cocatalysts, these complexes were active for the polymerization of ethylene, with activities lower than those of metal complexes of the general formula {[(2-ArN=C(Me))2C5H3N]MCl2} (Ar=ortho dialkyl-substituted aryl ring; M=Co, Fe), containing no substituents in 2,6-acetylpyridine ring. The effects of the catalyst structure and temperature on the polymerization activity, thermal properties, and molecular weight were discussed.
Keywords:catalysis;electronic effects;polyethylene;polymerization;transition metal chemistry
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