Preparation method and application of a cross-linked polyetherimide-based dielectric composite film
A technology of polyetherimide-based medium and polyetherimide-based matrix, which is applied in the field of dielectric composite films and cross-linked polyetherimide-based dielectric composite materials, and can solve poor dielectric properties and thermal stability Performance, poor filler dispersion and compatibility, etc., to achieve the effect of high dielectric constant, good dielectric properties, and low dielectric loss
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[0061] [Preparation method of polyetherimide-based dielectric composite material]
[0062] As mentioned above, the present invention provides a method for preparing the above-mentioned polyetherimide-based dielectric composite material. The method includes the following steps:
[0063] The first step: Hydrogen peroxide hydroxylation, γ-aminopropyltriethoxysilane functionalization and phenylynyl functionalization are carried out sequentially on the surface of inorganic nano-ceramic particles to prepare inorganic nano-ceramic particles with core-shell structure and serve as inorganic nanofillers;
[0064] The second step: prepare a polyether amic acid solution, and use it as a polymer matrix;
[0065] The third step: mixing the inorganic nano-ceramic particles with a core-shell structure in the first step and the polyether amic acid solution in the second step, and preparing a polyetherimide-based dielectric composite material after heat treatment.
[0066] In a preferred vers...
Embodiment 1
[0135] 1. Surface modification of inorganic nano ceramic particles - preparation of phenylynyl functionalized nanoparticles (BT-PEPA), the preparation method is as follows:
[0136] (1) Hydroxylation reaction of BT
[0137] 20g of BT was placed in a 1000mL three-neck flask, and then 500mL of hydrogen peroxide (H 2 o 2 ) solution (30wt%), after ultrasonic dispersion 60min, then the three-necked flask that fills dispersion liquid is placed in oil bath, under N 2 Under the protection of the atmosphere, mechanically stir and heat to about 100°C for reflux reaction for 6 hours, then cool to room temperature, and centrifuge (9000r / min, 5min). The obtained nanoparticles are washed with deionized water and then centrifuged. C and dried for 12 hours to obtain hydroxylated BT nanoparticles (BT-OH).
[0138] (2) Amination reaction of BT
[0139] Put 5g of BT-OH in a three-necked flask, then add 80mL of toluene, ultrasonically disperse for 60min, place the three-necked flask containin...
Embodiment 2
[0154] The other steps are the same as in Example 1, the only difference is that the volume fraction ratio of the polymer in solution A and the BT-PEPA nanoparticles in solution B is changed to prepare a cross-linked polyetherimide dielectric composite containing 5vol% BT-PEPA. Thin film, the thickness of the film is about 20 μm, recorded as c-5vol%BT-PEPA@10%PEPA-PEI.
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