Polyethersulfone-based dielectric composite material and preparation method thereof
A composite material and polyethersulfone technology are applied in the field of polyethersulfone-based dielectric composite materials and their preparation, and can solve the problems of poor heat resistance of composite materials, difficulty in controlling particle size, and large particle size of powder. Achieve the effects of avoiding secondary sedimentation and agglomeration, good interfacial compatibility and dispersion performance, and uniform particle size
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[0041] The preparation method of the polyethersulfone-based dielectric composite material of the present invention comprises the following steps:
[0042] a. Mix polyethersulfone, CPEN@BT nanofiller and organic solvent to obtain polyethersulfone / barium titanate solution; wherein, the concentration of polyethersulfone is 20-200mg / mL; the dosage of CPEN@BT nanofiller is polyether 10-60% of the mass of sulfone;
[0043] b. Add the sodium dodecyl sulfonate aqueous solution into the high-speed emulsifier at a speed of 10,000 to 14,000 rpm. After stabilizing the speed, add the polyethersulfone / barium titanate solution prepared in step a to the high-speed ball mill. Emulsify in an aqueous solution of sodium dialkylbenzenesulfonate for 3 to 5 minutes to obtain a uniformly dispersed emulsion of polyethersulfone / barium titanate;
[0044] c. removing the organic solvent from the polyethersulfone / barium titanate uniform dispersion emulsion to obtain a polyethersulfone / barium titanate uni...
Embodiment 1
[0053] 1. Synthesis of carboxyl polyarylether nitrile
[0054] (1) Add 34.4g of 2,6-dichlorobenzonitrile to 75mL of N-methylpyrrolidone to obtain a solution with a concentration of 0.459g / mL;
[0055] (2) Add 64g of phenolphthalein, 33.0g of potassium carbonate and 25mL of toluene to the solution obtained in step (1) successively, dehydration reaction at 150°C for 2h, then gradually release water and toluene, raise the reaction temperature to 180°C and then Carry out the reaction of polymerizing into macromolecules, and obtain carboxyl polyarylether nitrile when the viscosity of the polymer no longer rises.
[0056] (3) Pour the reaction product of step (2) into acetone-free precipitation, collect the crude product, and then wash it with deionized water and absolute ethanol 5 times respectively; dry it in a vacuum oven at 120°C for 12h to obtain carboxyl-containing poly Aryl ether nitrile. The structural formula of the carboxyl-containing polyarylether nitrile obtained is as...
Embodiment 2～6
[0078] According to the preparation method of Example 1, only the mass fraction of CPEN@BT in the polyethersulfone resin was changed, and the specific changes are shown in Table 1. The properties of the obtained polyethersulfone / barium titanate composite film are shown in Table 1. Its cross-sectional SEM image and figure 2 similar. It can be seen from the cross-sectional SEM images that the composite material of the present invention, even when the nanoparticle content is high, still exhibits good interfacial compatibility and dispersion performance, and the electrical, mechanical and other comprehensive properties of the composite material are significantly improved.
[0079] Table 1
[0080]
[0081] It can be seen from Table 1 that with the increase of CPEN@BT content, the dielectric constant of the composite film increases gradually, and the glass transition temperature increases gradually.
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