Preparation method and application of high-molecular-weight transparent polyesters
A high molecular weight, polyester technology, applied in the direction of coating, can solve the problems of low molecular weight of polyester, dark polyester color, poor transparency, etc., to achieve excellent mechanical and thermal properties, thermal decomposition temperature increase, mechanical properties boosted effect
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Embodiment 1
[0032] Example 1: Add 2.989 g (18.2 mmol) of terephthalic acid, 0.316 g (2.1 mmol) of 2,5-furandicarboxylic acid and 2.629 g (18.2 mmol) of 1,8-octane in a 50 mL single-necked flask diol and 0.015 g (0.1 mmol) of trifluoromethanesulfonic acid, and the reaction mixture was reacted at 175 ° C for 4.0 h under nitrogen protection. Then raise the temperature to 220° C., and react for 3.0 h under a pressure environment of 15 KPa to obtain a crude polymer product. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70°C for 3.0 hours to obtain the required high molecular weight polyester 3.295g polyester P 1 , its weight-average molecular weight is 140,000Da, the molecular weight distribution is 1.9, and the yield is 89.98%.
[0033] F...
Embodiment 2
[0043] Example 2: 2.989 g (18.2 mmol) of isophthalic acid, 0.316 g (2.1 mmol) of 2,5-furandicarboxylic acid and 2.629 g (18.2 mmol) of 1,8-octanedicarboxylic acid were sequentially added to a 50 mL single-necked flask alcohol and 0.010 g (0.1 mmol) of sulfamic acid, and the reaction mixture was reacted at 165 ° C for 3.0 h under nitrogen protection. Then raise the temperature to 225° C., and react for 3.0 h under a pressure environment of 15 KPa to obtain a crude polymer product. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70 °C for 3.0 h to obtain 3.452 g of polyester P 2 , its weight average molecular weight is 140,328Da, the molecular weight distribution is 2.3, and the yield is 90.05%.
[0044] Polyester P 2 High mo...
Embodiment 3
[0046] Example 3: Add 0.332 g (2.1 mmol) of isophthalic acid, 2.54 g (18.2 mmol) of 2,5-furandicarboxylic acid and 0.292 g (2.1 mmol) of 1,8-octane in a 50 mL single-necked flask diol and 0.018 g (0.1 mmol) of p-fluorobenzenesulfonic acid, and the reaction mixture was reacted at 170 ° C for 4.0 h under nitrogen protection. Then raise the temperature to 230° C., and react for 3.0 h under a pressure environment of 15 KPa. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70 °C for 3.0 h to obtain 3.232 g of polyester P 3 , its weight-average molecular weight is 150,000Da, the molecular weight distribution is 3.0, and the yield is 89.95%.
[0047] Polyester P 3 High molecular weight and transparent, it can be used as the main co...
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