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 shu

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

Received Date: 22 September 2013
Revised Date: 18 November 2013

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 91222201, 21173165 and 20871098), the Program for New Century Excellent Talents in Universities from the Ministry of Education of China (No. NCET-10-0936), the State Key Laboratory of Structure Chemistry (20100014), the Provincial Natural Foundation (2011JQ2011) of Shaanxi, the Education Committee Foundation of Shaanxi Province (11JK0588, 12JK0577), Graduate Innovation and Creativity Fund (YZZ12038) of Northwest University and Hong Kong Research Grants Council (HKBU 202407 and FRG/06-07/II-16).

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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