Method for preparing hollow ball with temperature response or temperature and pH responses
A temperature-responsive, hollow sphere technology, applied in the preparation of environment-responsive hollow spheres, the field of hollow sphere preparation
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Embodiment 1
[0031]Prepare 200ml of 13.6g / L N-isopropylacrylamide aqueous solution. After 15 minutes of passing nitrogen gas in the aqueous N-isopropylacrylamide solution, 2 ml of a N,N-dimethylformamide (DMF) solution of 24 g / L AIBN was added. After sealing the reactor, polymerization was initiated in a 60°C water bath. When the system changed from transparent to light blue, add 4ml of 9.2g / L dimethyl diallyl ammonium chloride with a syringe, and continue to react for 8 hours. Then the system was cooled to room temperature (about 25°C) and stirred for 36 hours. The solution was collected on a centrifuge at a speed of 8000r / min. The obtained PNIPAM hollow sphere has temperature sensitivity, its LCST is about 32° C., the outer diameter is about 800-1000 nm, and the cavity diameter is 600-800 nm. Its electron microscope photo is as figure 1 As shown, the temperature-sensitive curve is as figure 2 shown.
Embodiment 2
[0033] Prepare 200ml of 6.8g / L N-isopropylacrylamide aqueous solution. After passing nitrogen through the above solution for 15 minutes, add 2ml of 35g / L benzoyl peroxide (BPO) in N,N-dimethylformamide (DMF) solution, seal the reactor, and initiate polymerization in a water bath at 60°C . When the system turns from transparent to light blue, add 2ml of 9.2g / L N,N'-methylenebisacrylamide with a syringe, and add 5ml of 8.6g / L acrylamide solution at the same time, and continue the reaction for 12 hours. Then the system was cooled to room temperature (about 25°C) and stirred for 36 hours. The solution was collected in a centrifuge at a speed of 10000r / min. The obtained PNIPAM hollow sphere containing 5 mol% PAM has temperature sensitivity, its LCST is about 36° C., the outer diameter is about 800-1000 nm, and the cavity diameter is 600-800 nm.
Embodiment 3
[0035] Prepare 200ml of 6.8g / L N-isopropylacrylamide aqueous solution. After passing nitrogen gas through the above solution for 15 minutes, add 2 ml of 2 g / L hydrogen peroxide solution and 2 ml of 6 g / L sodium bisulfite solution. After the reactor was sealed, polymerization was initiated in a 50°C water bath. When the system turns from transparent to light blue, add 2ml of 9.2g / L N,N'-methylenebisacrylamide with a syringe, and simultaneously add 5ml of 17.2g / L acrylamide solution. The reaction was continued for 4 hours. Then the system was cooled to room temperature (about 25°C) and stirred for 36 hours. The solution was collected in a centrifuge at a speed of 10000r / min. The obtained PNIPAM hollow sphere containing 10 mol% PAM has temperature sensitivity, its LCST is about 41° C., the outer diameter is about 800-1000 nm, and the cavity diameter is 600-800 nm.
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