Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
권호 표지

Ring-Opening Polymerization of $\varepsilon$-Caprolactone and Cyclohexene Oxide Initiated by Aluminum $\beta$-Ketoamino Complexes: Steric and Electronic Effect of 3-Position Substituents of the Ligands

  • Liu, Binyuan (Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology) ;
  • Li, Haiqing (Department of Polymer Science and Engineering, Pusan National University) ;
  • Ha, Chang-Sik (Department of Polymer Science and Engineering, Pusan National University) ;
  • Kim, Il (Department of Polymer Science and Engineering, Pusan National University) ;
  • Yan, Weidong (Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology)
  • Published : 2008.07.31
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Abstract

A series of aluminum complexes supported by $\beta$-ketoamino, ligand-bearing, 3-position substituents $LAlEt_2$ ($L=CH_3C(O)C(Cl)=C(CH_3)NAr\;(L_1)$, $L=CH_3C(O)C(H)=C(CH_3)NAr\;(L_2)$, $L=CH_3C(O)C(Ph)=C(CH_3)NAr\;(L_3)$, and $L=CH_3C(O)C(Me)=C(CH_3)NAr\;(L_4)$, $Ar=2,6-^iPr_2C6H_3$) were synthesized in situ and employed in the ring-opening polymerization (ROP) of $\varepsilon$-caprolactone ($\varepsilon$-CL) and cyclohexene oxide (CHO). The 3-position substituents on the $\beta$-ketoamino ligand backbone of the aluminum complexes influenced the catalyst activity remarkably for both ROP of $\varepsilon$-CL and CHO. Aluminum $\beta$-ketoamino complexes displayed different catalytic behavior in ROP of $\varepsilon$-CL and CHO. The order of the catalytic activity of $LAlEt_2$ was $L_1AlEt_2$>$L_2AlEt_2$>$L_3AlEt_2$>$L_4AlEt_2$ for ROP of $\varepsilon$-CL, being opposite to the electron-donating ability of the 3-position substituents on the $\beta$-ketoamino ligand, while the order of the catalytic activity for ROP of CHO was $L_1AlEt_2$>$L_3AlEt_2$>$L_4AlEt_2$>$L_2AlEt_2$. The effects of reaction temperature and time on the ROP were also investigated for both $\varepsilon$-CL and CHO.

Keywords

References

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