Macromolecular Research

  • 제13권1호
  • /
  • Pages.2-7
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  • 2005
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  • 1598-5032(pISSN)
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  • 2092-7673(eISSN)
한국고분자학회 (The Polymer Society of Korea)
권호 표지

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)
  • 발행 : 2005.02.01
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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.

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