A preparation method of adjustable strawberry-like silica-organic hybrid composite microspheres
A silicon dioxide and organic hybrid technology, which is applied in the fields of inorganic, organic and polymer materials, can solve the problems of complex synthesis method and complicated steps, and achieve the effect of simple preparation method.
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Embodiment 1
[0036] Example 1: Strawberry-shaped silica-polystyrene hybrid composite microspheres using absolute ethanol and deionized water as solvents
[0037] (1) Preparation of 400nm silica particles
[0038] Utilize according to patent CN101691426A -Fink-Hohn synthesis method, at room temperature, add 140g of absolute ethanol, 30g of ammonia water with a mass fraction of 25%, and 30.5g of distilled water in sequence in a 500mL three-necked flask equipped with electric stirring. Add 20.6g ethyl orthosilicate and react at room temperature for 8h. The resulting suspension was transferred to a beaker, and the solvent was naturally volatilized completely to obtain a silica colloidal crystal template with an average particle size of 400 nm, and the template was ground in a mortar to obtain silica nanoparticles.
[0039] figure 2 It is a photo obtained by scanning 400nm silica particles with a model FEI Nano SEM 450 scanning electron microscope. It can be seen from the picture that the ...
Embodiment 2
[0043] Example 2: Strawberry-shaped silica-polystyrene hybrid composite microspheres using absolute ethanol and deionized water as solvents
[0044] (1) The preparation of 400nm silica nanoparticles is the same as step (1) in Example 1;
[0045] (2) Take 0.15 g of the silica nanoparticles obtained in the dried step (1) in a four-necked bottle, add 10.2 mL of absolute ethanol and 23.8 mL of deionized water, and place the four-necked bottle in an ultrasonic cleaner, Ultrasonic treatment for 1 h at 100 W power, transfer the reaction system to an oil bath equipped with mechanical stirring for stirring at a speed of 300 rpm and argon gas for 30 min, then add 400 μL (ie 0.3636 g) of argon at a rate of one drop every 3 seconds Styrene monomer, after heating up to 70°C, add 2mL of potassium persulfate (KPS) aqueous solution with a mass fraction of 1% at a rate of one drop every 3 seconds for 7 hours, after the reaction stops, naturally cool down to 20-30°C, and centrifuge at 6000rpm ...
Embodiment 3
[0047] Example 3: The strawberry-like silica-poly 4-fluorostyrene hybrid composite microspheres (1) 400nm silica nanoparticles are prepared in the same steps as in Example 1 with absolute ethanol and deionized water as solvents ( 1);
[0048] (2) Take 0.15 g of the silica nanoparticles obtained in the dried step (1) in a four-necked bottle, add 10.2 mL of absolute ethanol and 23.8 mL of deionized water, and place the four-necked bottle in an ultrasonic cleaner, Ultrasonic treatment for 1 h at 100 W power, transfer the reaction system to an oil bath equipped with mechanical stirring for stirring at a speed of 300 rpm and argon gas for 30 min, then add 400 μL (0.4096 g) of argon at a rate of one drop every 3 seconds 4-Fluorostyrene monomer, after heating up to 70°C, add 2mL potassium persulfate (KPS) aqueous solution with a mass fraction of 1% at a rate of one drop every 3 seconds for 7 hours, and naturally cool down to 20-30°C after the reaction stops. Centrifuge at 6000 rpm a...
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