Preparation method of block copolymer
A technology of block copolymers and copolymers, applied in the field of block copolymer preparation, which can solve the problems of large amount of raw materials, difficult control of block length, high requirements for monomer types, etc.
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Embodiment 1
[0025] The first step, the synthesis of prepolymer polystyrene-bromine.
[0026] Dry the three-neck flask, hollow stopper, connecting pipe, spherical condenser, etc. at 120°C for 1 hour, install it while it is hot, and put it into a stirring bar. Heat and bake with an oil bath at 60°C and blow nitrogen, then add 100 parts of styrene, 10 parts of 2-2'-bipyridine and 100 parts of cuprous bromide in sequence, and stir for 30 minutes to form a stable complex. Inject 10 parts of ethyl α-bromoisobutyrate with a syringe, continue to use nitrogen to remove oxygen and raise the temperature to 90°C, continue to pass nitrogen under stirring for 4 hours, and then stop the reaction. Add a small amount of tetrahydrofuran to dissolve, and absorb the catalyst through the aluminum oxide column, absorb the reaction solution with a dropper and slowly add the precipitant to anhydrous methanol for precipitation, and stir while adding dropwise. The resulting precipitate was vacuum-dried at 60° C. ...
Embodiment 2
[0037] The first step, the synthesis of prepolymer polystyrene-bromine.
[0038] Dry the three-necked flask, hollow stopper, connecting pipe, spherical condenser, etc. at 120°C for 1 hour, install it while it is hot, and put it into a stirring bar. Heated and baked with an oil bath at 60°C and ventilated with nitrogen, then sequentially added 150 parts of styrene, 15 parts of 2-2'-bipyridine and 150 parts of cuprous bromide, and stirred for 30 minutes to form a stable complex. Inject 10 parts of ethyl α-bromoisobutyrate with a syringe, continue to use nitrogen to remove oxygen and raise the temperature to 90°C, continue to pass nitrogen under stirring for 4 hours, and then stop the reaction. Add a small amount of tetrahydrofuran to dissolve, and absorb the catalyst through the aluminum oxide column, absorb the reaction solution with a dropper and slowly add the precipitant to anhydrous methanol for precipitation, and stir while adding dropwise. The resulting precipitate was v...
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