Polycarbonate unit-containing polylactic acid copolymer and preparation method thereof
A polylactic acid copolymer and polycarbonate technology, which is applied in the field of polylactic acid copolymer and the preparation of polylactic acid composition containing aliphatic polycarbonate units, can solve the problem of low molecular weight of the copolymer, high production cost, non-biological origin, etc. question
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preparation example 1
[0065] After pouring 200 g of 90 wt % L-lactic acid aqueous solution into a 500 mL four-necked flask, the flask was placed in an oil bath. Install a stirrer on the four-neck flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace with nitrogen for 3 times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add 107mg (300ppm) of stannous acetate and 363mg (632ppm) of 1,3-propanedisulfonic acid. Then the temperature of the system was raised to 160°C, the pressure was gradually reduced from normal pressure to 0.3KPa within 2 hours, and the pressure was kept at 0.3KPa for 4 hours (6 hours in total) after melt polymerization, poured out...
preparation example 2
[0068] 100g isosorbide and 500ml pyridine are added in the 1000ml round bottom flask, dissolve isosorbide at room temperature. Another 300ml of 0.76g / mol triphosgene in dichloromethane was added dropwise to the above isosorbide solution at 0°C and stirred at 0°C for 3h. 200mlH 2 O was added to the above reaction system to quench the terminal acid chloride group, and chloroform was added to remove pyridine in the system by azeotropic distillation. Methanol was added to the residual oil, and the precipitated polymer was filtered and washed four times with methanol and water. After filtration, the polymer was dried at 50° C. in a nitrogen atmosphere to obtain 105.8 g of a polycarbonate prepolymer. By testing the product samples, the following main properties are obtained:
[0069] Weight average molecular weight Mw: 3857. Glass transition temperature Tg: 124°C.
preparation example 3
[0071] Add 100 g of isosorbide and 500 ml of pyridine into a 1000 ml round bottom flask, and dissolve the isosorbide at room temperature. Another 300ml of 0.76g / mol triphosgene in dichloromethane was added dropwise to the above isosorbide solution at 0°C and stirred at 0°C for 10h. 200mlH 2 O was added to the above reaction system to quench the terminal acid chloride group, and chloroform was added to remove pyridine in the system by azeotropic distillation. Methanol was added to the residual oil, and the precipitated polymer was filtered and washed four times with methanol and water. After filtration, the polymer was dried at 50° C. in a nitrogen atmosphere to obtain 105.8 g of a polycarbonate prepolymer. By testing the product samples, the following main properties are obtained:
[0072] Weight average molecular weight Mw: 12973. Glass transition temperature Tg: 141°C.
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