Hybrid polyester and preparation method thereof
A hybrid polyester technology, applied in the field of hybrid polyester and its preparation, can solve the problems of stress concentration, uneven dispersion, affecting the physical and mechanical properties of materials, and achieve improved mechanical properties and thermal stability. The effect of crystallinity, good degradability
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Embodiment 1
[0039] Measure diethyl oxalate and ethanolamine at a molar ratio of 1:2, drop the ethanol solution of diethyl oxalate into the ethanol solution of ethanolamine using a constant pressure dropping funnel, and stir at room temperature for 24 hours to obtain a white suspension . The intermediate product was obtained after filtering, washing and drying. Weigh lactide, intermediate product and stannous isooctanoate by mass ratio 20:1:1, N 2 Under the atmosphere, melt reaction at 135°C for 4 hours, filter, wash, and dry to obtain a hybrid polylactic acid, as shown below. Using NMR, FTIR, GPC and DSC to characterize the structure and thermal properties of the resulting hybrid polylactic acid, the results are as follows: M n =5200g / mol; T g =35°C; T m = 120°C.
[0040]
[0041] Such as figure 1 Shown is the H NMR spectrum of the hybrid polylactic acid obtained in this embodiment, 1 H NMR (400MHz, DMSO) δ8.87(s,1H),5.47(s,1H),5.28-5.14(m,35H),4.23-4.07(m,2H),3.38(s,2H),1.53- ...
Embodiment 2
[0044] Measure diethyl oxalate and ethanolamine at a molar ratio of 1:2, drop the ethanol solution of diethyl oxalate into the ethanol solution of ethanolamine using a constant pressure dropping funnel, and stir at room temperature for 24 hours to obtain a white suspension . The intermediate product was obtained after filtering, washing and drying. Weigh lactide, intermediate product and stannous isooctanoate by mass ratio 20:1:1, N 2 Under the atmosphere, melt reaction at 135°C for 24 hours, filter, wash, and dry to obtain a hybrid polylactic acid, whose structural formula is shown below. Using NMR, FTIR, GPC and DSC to characterize the structure and thermal properties of the resulting hybrid polylactic acid, the results are as follows: M n = 31000 g / mol; T g =51°C; T m = 158°C.
[0045]
[0046] The H NMR spectrum information is as follows: 1 HNMR(400MHz,DMSO)δ8.88(s,1H),5.46(s,1H),5.25-5.13(m,211H),4.22-4.07(m,2H),3.38(s,2H),1.54-1.32 (m, 633H), proving that the o...
Embodiment 3
[0048] Diethyl oxalate and ethylenediamine are weighed in a molar ratio of 10:1, and the ethylenediamine / tetrahydrofuran solution is slowly added dropwise to excess diethyl oxalate in tetrahydrofuran solution using a constant pressure dropping funnel, After stirring at room temperature for 24 h, a white suspension was obtained, which was filtered, washed and dried to obtain intermediate product A. Weigh the intermediate product A and ethanolamine at a molar ratio of 10:1, slowly drop the intermediate product A / chloroform solution into the tetrahydrofuran solution containing excess ethanolamine using a constant pressure dropping funnel, heat and stir, and reflux for 24 hours to obtain a white suspension , intermediate product B was obtained after filtration, washing and drying. Weigh lactide and intermediate product B and feed into toluene solution in a certain molar ratio, add 0.5wt% stannous octoate, N 2 Under the atmosphere, heat and stir, and reflux for 24 hours to obtain ...
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