Patent ID: 11912818
Assignee: ZHEJIANG UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A method for synthesizing an aromatic-aliphatic copolyester without a catalyst, comprising:
a prepolymerization stage: under the condition of not adding a catalyst, subjecting raw materials comprising an aromatic dicarboxylic acid, a dihydric alcohol and a cyclic dicarboxylic acid or a corresponding anhydride thereof to an esterification reaction to obtain a carboxyl-terminated prepolymer, wherein the total molar amount of the dicarboxylic acids is greater than the molar amount of the dihydric alcohol, the molar ratio of the aromatic dicarboxylic acid to the dihydric alcohol is (0.001-0.899):1, the cyclic dicarboxylic acid is a dicarboxylic acid capable of forming a cyclic anhydride easily and is specifically selected from at least one of succinic acid, 2-methylsuccinic acid, 2-phenylsuccinic acid, 2-benzylsuccinic acid, 2,2-dimethylsuccinic acid, 2,3-dimethylsuccinic acid, 2,3-diphenylsuccinic acid, 1,2-cyclosuccinic acid, 2,2,3,3-tetramethylsuccinic acid, maleic acid, phthalic acid, glutaric acid, 2-ketoglutaric acid, 1,3-acetonedicarboxylic acid, 2-methylglutaric acid, 3-methylglutaric acid, 3-phenylglutaric acid, 2,2-dimethylglutaric acid, 3,3-dimethylglutaric acid, 3-ethyl-3-methylglutaric acid, 3,3-tetramethyleneglutaric acid and diglycolic acid;
and the anhydride is selected from anhydrides corresponding to the cyclic dicarboxylic acid and is specifically selected from at least one of succinic anhydride, 2-methylsuccinic anhydride, 2-phenylsuccinic anhydride, 2-benzylsuccinic anhydride, 2,2-dimethylsuccinic anhydride, 2,3-dimethylsuccinic anhydride, 2,3-diphenylsuccinic anhydride, 1,2-cyclosuccinic anhydride, 2,2,3,3-tetramethylsuccinic anhydride, maleic anhydride, phthalic anhydride, glutaric anhydride, 2-ketoglutaric anhydride, 1,3-acetonedicarboxylic anhydride, 2-methylglutaric anhydride, 3-methylglutaric anhydride, 3-phenylglutaric anhydride, 2,2-dimethylglutaric anhydride, 3,3-dimethylglutaric anhydride, 3-ethyl-3-methylglutaric anhydride, 3,3-tetramethyleneglutaric anhydride and diglycolic anhydride; and
a polymerization stage: under the condition of reduced pressure, removing the anhydride corresponding to the cyclic dicarboxylic acid from the carboxyl-terminated prepolymer at a reaction temperature not lower than the boiling point of the anhydride corresponding to the cyclic dicarboxylic acid to obtain an aromatic-aliphatic copolyester.