Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Butadiene Polymerization Catalyzed by Tri(aryloxo)aluminum Adduct of Cobalt Acetate

  • Park, Ji Hae (Department of Molecular Science and Technology, Ajou University) ;
  • Kim, Ahreum (Department of Molecular Science and Technology, Ajou University) ;
  • Jun, Sung Hae (Department of Molecular Science and Technology, Ajou University) ;
  • Kwag, Gwanghoon (R&BD Center, Korea Kumho Petrochemical Co., Ltd.) ;
  • Park, Ka Hyun (Department of Chemistry, Chonnam National University) ;
  • Lee, Junseong (Department of Chemistry, Chonnam National University) ;
  • Lee, Bun Yeoul (Department of Molecular Science and Technology, Ajou University)
  • Received : 2012.08.09
  • Accepted : 2012.09.12
  • Published : 2012.12.20
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Abstract

Tris(2-phenylphenoxo)aluminum ($(2-PhC_6H_4O)_3Al$) exists as a dimeric form in toluene. When toluene-insoluble anhydrous cobalt acetate is treated with tris(2-phenylphenoxo)aluminum in toluene, the toluene-soluble adduct $(2-PhC_6H_4O)_3Al{\cdot}Co(OAc)_2$ is formed. The 2-phenylphenoxo ligand in the adduct can be replaced with another aryloxo ligand to give (aryloxo)$(2-PhC_6H_4O)_2Al{\cdot}Co(OAc)_2$ (aryloxo = 2-methylphenoxo, 2-isopropylphenoxo, 4-methylphenoxo, 4-isopropylphenoxo, or 4-tert-butylphenoxo). These complexes are active for butadiene polymerization without gel formation when activated with an equivalent amount of $(2-PhC_6H_4O)AlEt_2$ for 2 h. The highest activity, 175 kg/mol-Co (turnover number, 3200) was achieved with $(2-PhC_6H_4O)_3Al{\cdot}Co(OAc)_2$ at $65^{\circ}C$ for 2 h. The microstructure of the polymer chains is mostly trans-1,4-configuration (70-75%) with the remaining being 1,2-vinyl. The cis-1,4-configuration observed by IR is minimal (1-5%). By replacing the 2-phenylpheoxo with a 4-alkylphenoxo ligand, the amount of 1,4-configuration slightly increases, resulting in increase in the endothermic melting signal at $-30{\sim}50^{\circ}C$ in the DSC curve. The molecular weights of the polymers are high ($M_n$: 300000~800000) with a fairly narrow molecular weight distribution ($M_w/M_n$, 2.0-2.7).

Keywords

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