Nonmetal catalyst for cyclic ester ring-opening polymerization and application thereof
A non-metallic catalyst, ring-opening polymerization technology, applied in the chemical industry, can solve the problems affecting the performance of processed parts, polymer degradation, and high reaction temperature, and achieve the effects of eliminating heavy metal residues, simplifying the polymerization process, and reducing energy consumption.
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Embodiment 1
[0027] Take a 250mL three-neck round bottom flask, add 20.0g glycolide and 100mL tetrahydrofuran into it, and dissolve them completely at 50°C. Under the protection of nitrogen, 0.5 mL of methanol and 5 mL of 2M trimethylsilylated diazomethane in n-hexane were added to the above solution, reacted at 25°C for 1 h with stirring, and then 1 mL of glacial acetic acid was added to terminate the reaction. After the reaction, the obtained white flocculent solid was centrifuged, washed with fresh tetrahydrofuran, and then vacuum-dried to obtain 16.7 g of white polymer with a yield of 83.5% and a molecular weight of 1350 g / mol. The infrared and differential scanning calorimetry spectra of the obtained polymer are as follows: figure 1 and figure 2 shown.
[0028] From figure 1 It can be seen that the infrared spectrum of the white polymer is consistent with the value reported in the literature (Yu, C., et al., Crystallization behavior and crystalline structural changes of poly(glyco...
Embodiment 2
[0032] Take a 500mL three-neck round bottom flask, add 20.0g glycolide and 200mL toluene into it, and dissolve them completely at 100°C. Under nitrogen protection, 0.5 mL of methanol and 5 mL of 2M trimethylsilylated diazomethane in n-hexane were added to the solution, reacted at 45°C for 2 hours with stirring, and then 1 mL of glacial acetic acid was added to terminate the reaction. After the reaction, the obtained white flocculent solid was centrifuged, washed with fresh tetrahydrofuran, and then vacuum-dried to obtain 15.8 g of white polymer with a yield of 79% and a molecular weight of 1280 g / mol. The infrared and differential scanning calorimetry spectra of the product are similar to those of Example 1.
Embodiment 3
[0034] Take a 250mL three-neck round bottom flask, add 20.0g glycolide and 100mL acetone into it, and dissolve them completely at room temperature. Under the protection of nitrogen, 0.5 mL of methanol and 5 mL of 2M trimethylsilylated diazomethane in n-hexane were added to the solution, reacted at 30°C for 1 hour, and then 1 mL of glacial acetic acid was added to terminate the reaction. After the reaction, the obtained white flocculent solid was centrifuged, washed with fresh tetrahydrofuran, and vacuum-dried to obtain 17.2 g of a white polymer with a yield of 86% and a molecular weight of 1390 g / mol. The infrared and differential scanning calorimetry spectra of the product are similar to those of Example 1.
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