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Polyimide/multi-walled carbon nanotube/nano ferroferric oxide composite aerogel and preparation method thereof

A technology of multi-walled carbon nanotubes and composite airgel, which is applied in the field of composite materials, and achieves the effects of simple preparation method, good application prospect and excellent comprehensive performance

Active Publication Date: 2020-09-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some fields that have high requirements for electromagnetic pollution and information security, the absorbing performance of the composite airgel cannot meet the requirements. As an electromagnetic wave absorbing material, the absorbing performance of the composite airgel for electromagnetic waves needs to be further improved

Method used

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  • Polyimide/multi-walled carbon nanotube/nano ferroferric oxide composite aerogel and preparation method thereof
  • Polyimide/multi-walled carbon nanotube/nano ferroferric oxide composite aerogel and preparation method thereof
  • Polyimide/multi-walled carbon nanotube/nano ferroferric oxide composite aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Preparation of composite airgel PI / MWCNTs-COOH / mFe 3 o 4 (100 / 10 / 10)

[0050] The specific steps for preparing polyimide / multi-walled carbon nanotubes / nano ferric oxide composite airgel are as follows:

[0051] 1. Preparation of ammonium citrate modified nano Fe 3 o 4 (mFe 3 o 4 )

[0052] Add 4g of nanometer iron ferric oxide particles into 200mL of ammonium citrate aqueous solution (concentration of ammonium citrate solution is 1M), mechanically stir for 5min, then ultrasonically disperse for 60min, and then keep warm at 60°C for 12h, stirring once every 30min. Separate the phases of the system, remove the supernatant in the system, and wash the remaining part with acetone several times until the color of the acetone lotion changes from milky white to clear, and then dry the obtained solid at 60°C for 2 hours to obtain ammonium citrate modified Nano Fe 3 o 4 , hereinafter referred to as mFe 3 o 4 .

[0053] 2. Prepare polyamic acid ammonium salt...

Embodiment 2

[0058] Example 2: Preparation of composite airgel PI / MWCNTs-COOH / mFe 3 o 4 (100 / 9 / 9)

[0059] Using the same preparation method as in Example 1, the only difference is that the input amount of MWCNTs-COOH in step (2.2) is modified from 1g to 0.9g, TNMDIS is modified to 0.45g, mFe 3 o4 The input amount was changed from 1g to 0.9g, and PAA, MWCNTs-COOH, mFe 3 o 4 Composite airgel PI / MWCNTs-COOH / mFe with a weight ratio of 100:9:9 3 o 4 (100 / 9 / 9).

Embodiment 3

[0060] Example 3: Preparation of composite airgel PI / MWCNTs-COOH / mFe 3 o 4 (100 / 8 / 8)

[0061] Using the same preparation method as in Example 1, the only difference is that the input amount of MWCNTs-COOH in step (2.2) is modified from 1g to 0.8g, TNMDIS is modified to 0.4g, mFe 3 o 4 The input amount was changed from 1g to 0.8g, and PAA, MWCNTs-COOH, mFe 3 o 4 Composite airgel PI / MWCNTs-COOH / mFe with a weight ratio of 100:8:8 3 o 4 (100 / 8 / 8).

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Abstract

The invention discloses polyimide / multi-walled carbon nanotube / nano ferroferric oxide composite aerogel and a preparation method thereof, and particularly provides polymer-based composite aerogel which is prepared by taking a polymer as a matrix and taking a carbon material and a magnetic loss material as fillers. Wherein the polymer is a water-soluble polymer and / or a polymer with a water-solubleprecursor. Compared with polyimide-based composite aerogel obtained by only adding one functional filler of MWCNTs or Fe3O4, the polyimide-based composite aerogel obtained by simultaneously adding MWCNTs and Fe3O4 has the advantage that under the condition that the functional filler with the same content is added, the wave-absorbing property of the polyimide-based composite aerogel achieves a synergistic effect. The polymer-based composite aerogel provided by the invention has an anisotropic ordered pore structure, lower density, good thermal stability, significantly improved electromagneticwave absorbing performance and excellent comprehensive performance, and has a very good application prospect as an electromagnetic wave absorbing material in civil and military fields.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a composite airgel of polyimide / multi-walled carbon nanotubes / nano ferric oxide and a preparation method thereof. Background technique [0002] With the rapid development of electronic communication technology, the use of electronic communication equipment is becoming more and more common. While these electronic products bring us convenience, the electromagnetic hazards generated during their work are becoming increasingly prominent. Electromagnetic interference affects the normal operation of equipment, and electromagnetic pollution will have adverse effects on the human body and the natural environment. In addition, electromagnetic waves are used as a medium for transmitting information, and its leakage means the leakage of the information it transmits, which will seriously endanger information security. At present, the harm of electromagnetic waves to informati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K9/04C08K3/22C08K3/04C08J9/28
CPCC08J9/28C08J2201/0484C08J2205/026C08J2379/08C08K9/04C08K2003/2275C08K2201/011C08K3/041
Inventor 刘鹏波陈少康袁帅威代天文邹华维
Owner SICHUAN UNIV
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