Preparation of high molecular weight poly(butylene succinate)
A polybutylene succinate and high molecular weight technology is applied in the field of preparation of high molecular weight polybutylene succinate, and can solve the problems of low molecular weight and color difference of polybutylene succinate , to avoid adverse effects, increase molecular weight, and achieve the effect of high molecular weight
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Embodiment 1
[0025] Put succinic acid and 1,4-butanediol with a molar ratio of 1:1.1 into a 250ml flask, and add catalyst cerium sulfate and ethylene glycol antimony at the same time, the addition of the two is respectively the amount of succinic acid substance 0.2%. Connect the water separator, thermometer and stirrer, then place in a heating mantle, fill with nitrogen, heat and stir vigorously. When the temperature reached 150°C, it was held for 1.5 hours. After the esterification reaction was completed, the temperature was raised to 230° C., the vacuum was maintained at 60 Pa, and the stirring was strengthened at the same time, and the reaction was carried out for 3 hours. After the reaction, the product was poured into a dumbbell-shaped mold to prepare a sample for mechanical testing, or it was dissolved in chloroform and then precipitated with methanol for other testing.
[0026] The weight-average molecular weight of the measured polymer is 5.6×10 4 , its breaking strength is 35MP...
Embodiment 2
[0028] Put succinic acid and 1,4-butanediol in a molar ratio of 1:1.1 into a 250ml flask, and simultaneously add catalyst ammonium cerium sulfate and ethylene glycol antimony, and the addition amount of the two is the amount of succinic acid substance respectively 0.01%. Connect the water separator, thermometer and stirrer, then place in a heating mantle, fill with nitrogen, heat and stir vigorously. Hold for 1 hour when the temperature reaches 160°C. After the esterification reaction was completed, the temperature was raised to 230° C., the vacuum was kept at 10 Pa, and the stirring was strengthened at the same time, and the reaction was carried out for 3.5 hours. After the reaction, the product was poured into a dumbbell-shaped mold to prepare a sample for mechanical testing, or it was dissolved in chloroform and then precipitated with methanol for other testing.
[0029] The weight-average molecular weight of the measured polymer is 12.2×10 4 , the breaking strength is 4...
Embodiment 3
[0031] Put succinic acid and 1,4-butanediol with a molar ratio of 1:2 into a 250ml flask, and simultaneously add catalyst cerium ammonium nitrate and ethylene glycol antimony, and the addition amount of the two is the amount of succinic acid substance respectively 1%. Connect the water separator, thermometer and stirrer, then place in a heating mantle, fill with nitrogen, heat and stir vigorously. Hold for 1 hour when the temperature reaches 160°C. After the esterification reaction was completed, the temperature was raised to 230° C., a vacuum of 70 Pa was maintained, and stirring was strengthened at the same time, and the reaction was carried out for 3 hours. After the reaction, the product was poured into a dumbbell-shaped mold to prepare a sample for mechanical testing, or it was dissolved in chloroform and then precipitated with methanol for other testing.
[0032] The weight-average molecular weight of the measured polymer is 5.6×10 4 , its breaking strength is 35MPa, ...
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