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PAMMA-coated BT/PP nanocomposite dielectric film with controllable shell thickness and preparation method thereof

A nano-composite and dielectric technology, applied in the field of chemical materials, can solve the problems of difficult control of microscopic uniformity and interface characteristics of composite dielectrics, easy breakdown of heat concentration, and difficult processing and preparation, and achieves easy control implementation, simple preparation method, and mechanical good performance

Pending Publication Date: 2021-04-09
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the widely studied dielectric films today use ferroelectric polymers (such as polyvinylidene fluoride (PVDF) and its copolymers) as the matrix. Due to their intrinsic ferroelectric loss, these composite dielectrics have insurmountable charging Low discharge efficiency, concentrated heat generation and easy breakdown; and the use of non-polar polymers (such as polypropylene (PP)) with linear charge and discharge characteristics as the composite dielectric matrix has low ε (≈2.2) and difficult processing and preparation , Composite dielectric micro-uniformity and interface characteristics are difficult to control and other shortcomings

Method used

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  • PAMMA-coated BT/PP nanocomposite dielectric film with controllable shell thickness and preparation method thereof
  • PAMMA-coated BT/PP nanocomposite dielectric film with controllable shell thickness and preparation method thereof
  • PAMMA-coated BT/PP nanocomposite dielectric film with controllable shell thickness and preparation method thereof

Examples

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Embodiment 1

[0033] The preparation method of the PAMMA@BT / PP nanocomposite dielectric film with controllable shell thickness provided in this example includes the following steps:

[0034] 1) Preparation of PMMA@BT core-shell nano-hybrid particles by in situ radical polymerization

[0035] 1.1) Hydroxylated barium titanate BT nanoparticles:

[0036] In order to allow more organic groups to be grafted on the surface of BT, we first oxidized the BT nanoparticles with hydrogen peroxide to make the surface have more active hydroxyl groups.

[0037] Specifically, after drying the barium titanate BT nanoparticles in a vacuum oven at 80°C for 5 hours, inject 20 g of BT nanoparticles into 100 mL of H2O2 aqueous solution (concentration 30%) in a single-necked round-bottomed flask with a capacity of 250 mL, and ultrasonically disperse the mixture After 30 minutes of treatment, reflux in an oil bath at 105°C and stir mechanically, and react for 5 hours. After the reaction was finished, cool to roo...

Embodiment 2

[0051] The difference from Example 1 is that in step 1.4) of this example, 5 g of methyl methacrylate MMA was weighed (MMA / BT mass ratio is 0.25); the PMMA@BT prepared in this example has a core-shell structure, The shell thickness is 8nm;

[0052] In step 2) of this embodiment, the mass ratio of PMMA@BT / PMMA@BT / PP is 10%. The thickness of the PAMMA@BT / PP nanocomposite dielectric film is 40 μm.

Embodiment 3

[0054] The difference from Example 1 is that in this example, in step 1.4), 10 g of methyl methacrylate MMA (MMA / BT mass ratio is 0.5) is weighed; the PMMA@BT prepared in this example is a core-shell structure, the shell thickness is 6nm;

[0055] In this embodiment, the mass ratio of PMMA@BT / PMMA@BT / PP is 10%; the thickness of the PAMMA@BT / PP nanocomposite dielectric film is 30 μm.

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Abstract

The invention belongs to the technical field of chemical materials, and relates to a PAMMA-coated BT / PP nanocomposite dielectric film with controllable shell thickness and a preparation method thereof. The preparation method comprises the following steps: 1) initiatingin-situ free radical polymerization of methyl methacrylate MMA on the surface of barium titanate BT to prepare PMMA-coated BT nanoparticles; 2) carrying out melt blending on the PMMA-coated BT nanoparticles and polypropylene PP for 15 minutes to obtain a sample; and 3) cutting the sample into small samples, and carrying out hot press molding at 190 DEG C and 125 MPa by using a hot press to obtain the PMMA-coated BT / PP nanocomposite dielectric film. The nanomaterial prepared by the invention has the characteristics of uniform core-shell structure, adjustable shell thickness and good dispersion; the dielectric film has good light transmission, excellent flexibility, small dielectric loss, high polarization strength, and synergistically improved breakdown strength and dielectric property; and the preparation method is simple in process and easy to control.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to a PAMMA@BT / PP nanocomposite dielectric film with controllable shell thickness and a preparation method. Background technique [0002] With the development of the electrical and electronic industry and the high-performance requirements of electronic energy systems, organic film dielectric capacitors have been favored for their micro / nanosecond charging and discharging speeds, wide temperature spectrum and spectrum stability, excellent withstand voltage and flexibility. people's attention. Most of the widely studied dielectric films today use ferroelectric polymers (such as polyvinylidene fluoride (PVDF) and its copolymers) as the matrix. Due to their intrinsic ferroelectric loss, these composite dielectrics have insurmountable charging Low discharge efficiency, concentrated heat generation and easy breakdown; and the use of non-polar polymers (such as polypropylene (PP))...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L23/12C08K9/10C08K3/24C08F292/00C08F220/12
CPCC08J5/18C08F292/00C08J2323/12C08K9/10C08K3/24C08K2201/011C08F220/12
Inventor 路卫卫蔡会武刘标
Owner XIAN UNIV OF SCI & TECH
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