Preparation method of long-chain hyperbranched poly(n-isopropylacrylamide) with temperature sensitivity
A technology of isopropylacrylamide and hyperbranched polymer, which is applied in the preparation of long-chain hyperbranched polymer and the preparation of functional long-chain hyperbranched polymer, can solve the problem that the main chain butadiene does not have stimuli-responsiveness and restricts its application. and other problems, to achieve high controllability and improve the effect of polymerization efficiency
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Embodiment 1
[0029] Weigh 744 mg of dipropargylamine, 79.1 mg of pyridine, and 244 mg of 4-dimethylaminopyridine, respectively, and place them in a dry single-necked flask, add 20 mL of dichloromethane as a solvent, and add 2-bromoisobutyryl bromide to another dry beaker 2207.04 mg, 2-bromoisobutyryl bromide was added dropwise to a one-necked flask under ice bath and magnetic stirring conditions. After dissolving the above substances, the resulting system was stirred and reacted at room temperature for 24 h. After the reaction was completed, 30 mL of distilled water was added to the solution and continued to stir for 20 min. The resulting mixed solution was extracted with a separatory funnel, and the organic phase was taken. This was repeated three times, and the final organic phase was dried with anhydrous sodium sulfate to obtain a light yellow transparent solution. . Concentrate the transparent solution with a rotary evaporator, use the ethyl acetate-petroleum ether blend solution as t...
Embodiment 2
[0036] Weigh 744 mg of dipropargylamine, 79.1 mg of pyridine, and 244 mg of 4-dimethylaminopyridine, respectively, and place them in a dry single-necked flask, add 20 mL of dichloromethane as a solvent, and add 2-bromoisobutyryl bromide 2207.04 mg to another dry beaker mg, add 2-bromoisobutyryl bromide dropwise to a one-necked flask under ice bath and magnetic stirring conditions. After dissolving the above substances, the resulting system was stirred and reacted at room temperature for 24 h. Add 30 mL of distilled water to the solution after the reaction and continue to stir for 20 min, extract the obtained mixed solution with a separatory funnel, take the organic phase, repeat this three times, and dry the final organic phase with anhydrous sodium sulfate to obtain a light yellow Clear solution. Concentrate the transparent solution with a rotary evaporator, use ethyl acetate-petroleum ether blend solution (the volume ratio of ethyl acetate and petroleum ether is 1:1) as the...
Embodiment 3
[0041] Weigh 744 mg of dipropargylamine, 79.1 mg of pyridine, and 244 mg of 4-dimethylaminopyridine, respectively, and place them in a dry single-necked flask, add 20 mL of dichloromethane as a solvent, and add 2-bromoisobutyryl bromide 2207.04 mg to another dry beaker mg, add 2-bromoisobutyryl bromide dropwise to a one-necked flask under ice bath and magnetic stirring conditions. After dissolving the above substances, the resulting system was stirred and reacted at room temperature for 24 h. Add 30 mL of distilled water to the solution after the reaction and continue to stir for 20 min, extract the resulting mixed solution with a separatory funnel, take the organic phase, repeat this three times, and dry the final organic phase with anhydrous sodium sulfate to obtain light yellow and transparent solution. Concentrate the transparent solution with a rotary evaporator, use ethyl acetate-petroleum ether blend solution (the volume ratio of ethyl acetate and petroleum ether is 1:...
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