Journal
CHINESE JOURNAL OF POLYMER SCIENCE
Volume 32, Issue 6, Pages 768-777Publisher
SPRINGER
DOI: 10.1007/s10118-014-1425-x
Keywords
Mononuclear [Zn(L)(H2O)] (1) or binuclear [Zn-2(L)(OAc)(2)(H2O)] (2) based on Salen-type Schiff-base ligand H2L; Ring-opening copolymerization from CHO and MA; Poly(ester-co-ether) and polyester
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Funding
- National Natural Science Foundation of China [91222201, 21173165, 20871098]
- Program for New Century Excellent Talents in Universities from the Ministry of Education of China [NCET-10-0936]
- State Key Laboratory of Structure Chemistry [20100014]
- Provincial Natural Foundation of Shaanxi [2011JQ2011]
- Education Committee Foundation of Shaanxi Province [11JK0588, 12JK0577]
- Graduate Innovation and Creativity Fund of Northwest University [YZZ12038]
- Hong Kong Research Grants Council [HKBU 202407, FRG/06-07/II-16]
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From the self-assembly of the typical Salen-type Schiff-base ligand H (2) L and Zn(OAc)(2)center dot 2H(2)O in the molar ratio of 1:1 or 1:2, the mononuclear [Zn(L)(H2O)] (1) or binuclear [Zn-2(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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