Process for preparing fatty polyester with variable degradative speed rate and preparation proces sof product thereof
A technology for the degradation rate of aliphatic polyesters, which is applied in the field of preparing aliphatic polyesters with different degradation rates or its products, which can solve the problems of adverse effects of application, lack of biodegradability, application restrictions, etc., and achieve a small amount of addition , Significant effect of degradation promotion
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Embodiment 1
[0020] First add 10mL of ε-caprolactone and stannous octoate with a molar ratio of 1:1000 to ε-caprolactone into the 4 polymerization tubes respectively, and then add trifluoroethylene trifluoride with a concentration of 46.8% and a density of 1.13g / mL respectively. boron ether ether (BF 3 ·OEt 2 ) solution 0, 5, 25, 50 μL, and then placed in an oil bath, under the protection of nitrogen or argon, polymerized at 110°C for 48h. After the polymerization is complete, the polymer is removed from the polymerization tube and placed in air.
[0021] BF 3 ·OEt 2 Amount added (μL)
Embodiment 2
[0023] Weigh 1.0 g of polyε-caprolactone with an initial intrinsic viscosity [η] of 1.02 in 4 conical flasks with stoppers, add 20 mL of benzene, and after it is completely dissolved, add the concentration of 0, 10, 20, and 50 μL of 46.8% boron trifluoride ether solution with a density of 1.13 g / mL, stirred and mixed for 24 hours, transferred the above solution to 4 petri dishes, vacuumed the solvent in a desiccator, and finally Dry in vacuum at 40°C until constant weight.
[0024] The obtained above-mentioned polyε-caprolactone, measured with the test conditions of Example 1, has an intrinsic viscosity [η] of 1.02, 0.85, 0.64, and 0.26, respectively.
Embodiment 3
[0026] Take by weighing tetrahydrofuran as solvent, polystyrene as standard, utilize gel permeation chromatography to measure its weight-average molecular weight Mw to be 42144, the number-average molecular weight Mn is the polyε-caprolactone 1.0g of 12715 in a conical flask with a stopper, Add 20 mL of benzene, and after it is completely dissolved, add 100 μL of boron trifluoride ether solution with a concentration of 46.8% and a density of 1.13 g / mL with a micro-syringe at room temperature, stir magnetically for 24 hours, transfer the solution into a Petri dish, Vacuumize the solvent in a desiccator, and finally vacuum-dry at 40°C until constant weight.
[0027] The obtained above-mentioned polyε-caprolactone was measured by gel permeation chromatography, and its weight-average molecular weight Mw decreased to 8252, and the number-average molecular weight Mn decreased to 2520.
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