Citation: Li-ying Wu, Dai-di Fan, Xing-qiang Lü, Rong Lu. Ring-Opening Copolymerization of Cyclohexene Oxide and Maleic Anhydride Catalyzed by Mononuclear [Zn(L)(H2O)] or Binuclear [Zn2(L)(OAc)2(H2O)] Complex Based on the Salen-type Schiff-base Ligand[J]. Chinese Journal of Polymer Science, ;2014, 32(6): 768-777. doi: 10.1007/s10118-014-1425-x
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From the self-assembly of the typical Salen-type Schiff-base ligand H2L and Zn(OAc)22H2O in the molar ratio of 1:1 or 1:2, the mononuclear [Zn(L)(H2O)] (1) or binuclear [Zn2(L)(OAc)2(H2O)] (2) are obtained, respectively. For both complexes 1 and 2, the unsaturated five-coordinate coordination environment to the catalytic active centers (Zn2+ ions) permits the monomer insertion for the effective solution copolymerization of cyclohexene oxide and maleic anhydride. All the solution copolymerizations afford poly(ester-co-ether)s, while lower catalyst and co-catalyst concentrations are helpful for the formation of alternating polyester. Of the three co-catalysts, 4-(dimethylamino)pyridine is found to be the most efficient, while an excess thereof is detrimental for chain growth of the copolymers.
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