High molecular weight polyester based on biomass as monomer, preparation method and use thereof
A high molecular weight, biomass technology, applied in the field of two-step reaction of catalytic polycondensation, can solve the problems that are difficult to meet the material properties, mechanical properties, poor processability, low melting point, etc., to achieve improved mechanical properties, excellent mechanical properties and thermal properties, The effect of low raw material cost
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[0027] Example 1: In a 50 mL single-necked flask, 5.084 g (20 mmol) of 2,5-dimethoxy dimethyl terephthalate, 1.862 g (30 mmol) of 1,2-ethylene glycol and 0.017 were sequentially added g (0.1 mmol) of p-toluenesulfonic acid, under nitrogen atmosphere, atmospheric pressure, 150 ℃ magnetic stirring conditions for transesterification reaction for 3 hours to obtain the transesterification product; then the transesterification product under a high vacuum pressure less than 20 Pa, The polycondensation reaction was performed under magnetic stirring at 250°C for 3 hours to obtain crude polyester; 50 mL of chloroform was added to the crude polyester, soaked for 3 hours and then filtered; the clear liquid was added dropwise to methanol to obtain a turbid system, and a precipitate was obtained after centrifugation. Filter, then wash with 10 mL of methanol, filter, and vacuum dry at 60°C to obtain 5.022 g of polyester P 1 The yield was 89.59%.
[0028] To determine the polyester P prepared in...
Example Embodiment
[0034] Example 2: In a 50 mL single-necked flask, 5.084 g (20 mmol) of 2,5-dimethoxy dimethyl terephthalate, 4.387 g (30 mmol) of 1,8-octanediol and 0.034 were sequentially added g (0.1 mmol) of tetrabutyl titanate, under nitrogen atmosphere, atmospheric pressure, 150 ℃ magnetic stirring conditions for the transesterification reaction for 3 hours to obtain the transesterification product; then the transesterification product under a high vacuum pressure of less than 20Pa The polycondensation reaction was carried out under magnetic stirring at 250℃ for 3h to obtain crude polyester; 50mL chloroform was added to the crude polyester, soaked for 3h and then filtered; the clear liquid was added dropwise to methanol to obtain a turbid system, and a precipitate was obtained after centrifugation , Filtered, then washed with 10mL methanol, filtered and dried under vacuum at 60°C to obtain 6.634g of polyester P 2 The yield was 91.01%.
Example Embodiment
[0035] Example 3: In a 50 mL single-necked flask, 5.084 g (20 mmol) of 2,5-dimethoxy dimethyl terephthalate, 2.859 g (28 mmol) of 1,3-cyclopentanediol and 0.03 g (0.1 mmol) of antimony trioxide, under nitrogen atmosphere, atmospheric pressure, 150 ℃ magnetic stirring conditions for transesterification reaction for 3 hours to obtain the transesterification product; then the transesterification product under high vacuum pressure less than 20Pa The polycondensation reaction was carried out under magnetic stirring at 250℃ for 3h to obtain crude polyester; 50mL chloroform was added to the crude polyester, soaked for 3h and then filtered; the clear liquid was added dropwise to methanol to obtain a turbid system, and a precipitate was obtained after centrifugation , Filtered, washed with 10 mL methanol, filtered, and dried under vacuum at 60°C to obtain 5.699 g of polyester P 3 The yield was 88.96%.
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