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Macromolecular research v.13 no.1, 2005년, pp.2 - 7  

Allyloxy-and Benzyloxy-Substituted Pyridine-bis-imine Iron(II) and Cobalt(II) Complexes for Ethylene Polymerization

Kim Il    (Department of Polymer Science and Engineering, Pusan National University   ); Han Byeong Heui    (Department of Polymer Science and Engineering, Pusan National University   ); Kim Jae Sung    (Department of Polymer Science and Engineering, Pusan National University   ); Ha Chang-Sik    (Department of Polymer Science and Engineering, Pusan National University  );
  • 초록

    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 $\{[(ArN=C(Me))_2(4-RO-C_5H_3N)]MCl_2\}$ (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 $\{[(2-ArN=C(Me)_2C_5H_3N]MCl_2\}$ (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.


  • 주제어

    catalysis .   electronic effects .   polyethylene .   polymerization .   transition metal chemistry.  

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