Method for preparing high cross-linking monodisperse polymer micro-sphere
A monodisperse, polymer technology, applied in the field of preparation of high cross-linking, monodisperse polymer microspheres, can solve problems such as unstable reaction of the polymerization system, inability to proceed, rough surface of polymer microspheres, etc., to achieve the method Simple, easy to handle, good thermal stability results
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Embodiment 1
[0026] The dispersant PVP (1.0 g) was dissolved in absolute ethanol (63 g) in a container, and stirred to dissolve. Under the protection of nitrogen, the temperature was raised to 70°C. After passing nitrogen for half an hour, styrene (10.0 g) dissolved with initiator AIBN (0.3 g) was added, and the stirring speed was adjusted to 120 rpm. After 4 hours of reaction, Dehydrated ethanol (22 g) dissolved in divinylbenzene (1.0 g) was slowly added at a rate of 0.13 mL / min, and the total reaction time was 12 h. After the reaction, the product was diluted with a large amount of absolute ethanol, centrifuged, and the dispersion medium and stabilizer were removed. The solid was washed 5 times with absolute ethanol and 3 times with water, and vacuum-dried at room temperature to constant weight. The yield was 83.2%.
[0027] The obtained polymer microspheres had a particle size of 1.75 μm, a particle size distribution of 1.005, a swelling ratio of 1.07, a WLR value of 6.2 wt%, and a ther...
Embodiment 2
[0029] The dispersant PVP (1.0 g) was dissolved in anhydrous methanol (63 g) in a container, and stirred to dissolve. Under the protection of nitrogen, the temperature was raised to 30°C. After passing nitrogen for half an hour, styrene (10.0 g) dissolved with initiator AIBN (0.3 g) was added, and the stirring speed was adjusted to 140 rpm. After 4 hours of reaction, Slowly add anhydrous methanol (22 g) dissolved in divinylbenzene (2.0 g) at a rate of 0.18 mL / min, and the total reaction time is 24 h. After the reaction, the product was diluted with a large amount of absolute ethanol, centrifuged, and the dispersion medium and stabilizer were removed. The solid was washed 5 times with absolute ethanol and 3 times with water, and vacuum-dried at room temperature to constant weight. The yield was 85.7%.
[0030] The obtained polymer microspheres had a particle size of 2.47 μm, a particle size distribution of 1.008, a swelling ratio of 1.03, a WLR value of 4.5 wt%, and a thermal d...
Embodiment 3
[0032] The dispersant PVP (2.0 g) was dissolved in absolute ethanol (63 g) in a container, and stirred to dissolve. Under the protection of nitrogen, the temperature was raised to 80°C. After passing nitrogen for half an hour, styrene (10.0 g) dissolved with initiator AVBN (0.5 g) was added, and the stirring speed was adjusted to 150 rpm. After reacting for 4 hours, Dehydrated ethanol (22 g) dissolved in divinylbenzene (3.0 g) was slowly added at a rate of 0.13 mL / min, and the total reaction time was 12 h. After the reaction, the product was diluted with a large amount of absolute ethanol, centrifuged, and the dispersion medium and stabilizer were removed. The solid was washed 5 times with absolute ethanol and 3 times with water, and vacuum-dried at room temperature to constant weight. The yield was 88.5%.
[0033] The obtained polymer microspheres had a particle size of 3.23 μm, a particle size distribution of 1.006, a swelling ratio of 1.02, a WLR value of 3.9 wt%, and a the...
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