Preparation method of multi-level polymer composite nano-microspheres with pH sensitivity
A technology of nano-microspheres and polymers, which is applied in the field of preparation of multi-level polymer composite nano-microspheres, can solve the problems of lack of environmental responsiveness, and achieve the effects of simple preparation methods, uniform particle size, and high application value
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Embodiment 1
[0021] (1) Preparation of functional core-shell nanospheres:
[0022] Add 8 mL of 0.1 mol / L HCl aqueous solution into a 150 mL three-neck flask, seal it with a stopper, place it in a water bath and raise the temperature to 75°C. Slowly drop 200 μL of 4-vinylpyridine into the above aqueous HCl solution. Continue to heat at a constant temperature of 75°C for 10 minutes, add 32 mL of deionized water, and let it fully dissolve for use. Return condensed water to the system at room temperature, and purge with nitrogen protection for 15 minutes, turn on magnetic stirring, slowly add 1000 μL of styrene, and start to heat up. Add accurately weighed 0.04g of potassium persulfate to a 10mL serum bottle, add 10mL of deionized water, and place in an ultrasonic instrument at room temperature for 5 minutes of ultrasonic oscillation. After the temperature of the above system is constant at 75°C, add it quickly. Keep the above conditions unchanged, react for 24h.
[0023] (2) Preparation o...
Embodiment 2~5
[0028] (1) Adjust the volume of the aqueous HCl solution of the same concentration as in Example 1 to 10 mL, 12 mL, and 15 mL, respectively, and add 30 mL, 28 mL, and 25 mL of deionized water, respectively. All the other are with embodiment 1.
[0029] (2) Same as embodiment 1.
[0030] (3) Same as embodiment 1.
[0031] The structures of the obtained monodisperse functional core-shell polymer nanospheres were observed and characterized by transmission electron microscope and scanning electron microscope respectively. From figure 1 A clear core-shell structure can be seen in the medium, and the particle size is less than 200nm. Wherein, the core layer is polystyrene, and the shell layer is poly-4-vinylpyridine. From figure 2 It can be seen that the obtained functional polymer nanospheres have uniform particle size and good dispersion. From image 3 It can be observed that there is a remarkable pH responsiveness when the pH is changed.
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