Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing graphene composite with low percolation threshold value and high heat stability

A technology with high thermal stability and percolation threshold, which is applied in the field of preparation of graphene composite materials with low percolation threshold and high thermal stability, can solve the problem of damage to material processing and mechanical properties, irreversible weakening of electrical properties, and unsatisfactory thermal stability and other problems, to achieve the effect of excellent thermal stability, stable phase area size and high specific strength

Inactive Publication Date: 2013-12-25
SHANGHAI JIAO TONG UNIV
View PDF1 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are currently two major defects that restrict the industrial application and promotion of CPC materials: (1) To obtain low room temperature resistivity with a high filler content, taking the most common carbon-based filler as an example, conductive composites filled with common fillers such as carbon black (CB) Material Percolation Threshold It is about 15-25vol%, and highly conductive fillers such as carbon nanotubes (CNTs) and vapor grown carbon fibers (VGCF) are easy to agglomerate and disperse in polymers due to their high specific surface area, and cannot significantly reduce , increasing the filler content can reduce the resistivity, but it often destroys the material processing and mechanical properties, resulting in limited application; (2) CPC materials are strongly dependent on time and temperature, and due to thermal stability after long-term power-on or repeated use Not ideal, its electrical properties will be irreversibly weakened

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing graphene composite with low percolation threshold value and high heat stability
  • Method for preparing graphene composite with low percolation threshold value and high heat stability
  • Method for preparing graphene composite with low percolation threshold value and high heat stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment relates to a method for preparing a low percolation threshold and high thermal stability ternary graphene-based conductive polymer composite material, comprising the following steps:

[0032] Step (1), graphene oxide (GO) grafted with γ-methacryloxypropyltrimethoxysilane (KH-570)

[0033] Weigh 500mg of graphene oxide (GO), add 500mL of deionized water, ultrasonicate for 5h and stir overnight, then disperse for 30min at 50% power of the cell crusher, and record it as solution A; add 2g of KH-570 to 100mL of pH=4.0 Deionized water was hydrolyzed at room temperature for 1 hour, which was recorded as solution B; the two solutions A and B were mixed, and reacted at 25°C for 24 hours. After the end, it was centrifuged at high speed and washed with ethanol for 3 times; the product was vacuum-dried at 60°C for 24 hours to obtain GO-KH570;

[0034] Step (2), GO-KH570 miniemulsion polymerization grafted styrene (St), methyl methacrylate copolymer (MMA)

[0035]W...

Embodiment 2

[0039] This embodiment relates to a method for preparing a low percolation threshold and high thermal stability ternary graphene-based conductive polymer composite material, comprising the following steps:

[0040] Step (1), graphene oxide grafted with γ-methacryloxypropyltrimethoxysilane (KH-570)

[0041] Weigh 100mg of graphene oxide (GO), add 150mL of deionized water, sonicate for 2h and stir overnight, then disperse for 30min at 50% power of the cell crusher, and record it as solution A; add 1g of KH-570 to 100mL pH=4.0 Deionized water was hydrolyzed at room temperature for 1 hour, which was recorded as solution B; the two solutions A and B were mixed, reacted at 50°C for 20 hours, and then centrifuged at high speed and washed with ethanol for 3 times; the product was vacuum-dried at 60°C for 24 hours to obtain GO-KH570;

[0042] Step (2), GO-KH570 miniemulsion polymerization grafted styrene (St), methyl methacrylate copolymer (MMA)

[0043] Weigh 300mg GO-KH570, 15g styr...

Embodiment 3

[0047] This embodiment relates to a method for preparing a low percolation threshold and high thermal stability ternary graphene-based conductive polymer composite material, comprising the following steps:

[0048] Step (1), graphene oxide grafted with γ-methacryloxypropyltrimethoxysilane (KH-570)

[0049] Weigh 500mg of graphene oxide (GO), add it into 500mL deionized water, ultrasonicate for 5h and stir overnight, then disperse for 30min at 50% power of the cell crusher, and record it as solution A; add 2g KH-570 to 500mL pH=4.0 Deionized water was hydrolyzed at room temperature for 1 hour, which was recorded as solution B; the two solutions A and B were mixed, reacted at 75°C for 16 hours, and then centrifuged at high speed and washed with ethanol for 3 times; the product was vacuum-dried at 60°C for 24 hours to obtain GO-KH570;

[0050] Step (2), GO-KH570 miniemulsion polymerization grafted styrene (St), methyl methacrylate copolymer (MMA)

[0051] Weigh 200mg GO-KH570, 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing a graphene composite with a low percolation threshold value and high heat stability. The method comprises the following steps: introducing double bonds by the grafting of graphene oxide with a silane coupling agent; polymerizing preliminarily-modified fillers with styrene and methyl methacrylate fine emulsion, and preparing modified fillers of grafting random copolymers; mixing the modified fillers with polystyrene and a poly methyl methacrylate solution, and using hydrazine hydrate for synchronous reduction; precipitating polymers, drying and performing. TEM tests for the graphene composite provided by the utility model show that part of fillers are distributed at two phases of interfaces and generates good compatibilization to a system, and the percolation threshold value is only 0.11 vol%. Meanwhile, SEM tests show that phase coarsening is inhibited before and after heat treatment, the heat stability of the system is obviously increased, and the graphene composite can be widely used in the field of conductive polymer composites.

Description

technical field [0001] The invention relates to a method for preparing a graphene composite material, in particular to a method for preparing a graphene composite material with a low percolation threshold and high thermal stability. Background technique [0002] Filled conductive polymer composites (Conductive Polymer Composites, CPC) are conductive fillers (carbon-based, metal-based, metal oxide three types) and insulating polymer matrix, through dispersion compounding, lamination compounding and the formation of surface conductive film The multi-phase composite conductive system formed after treatment in the same way. Because it has both the conductivity of the filler and the ease of processing of the polymer matrix, the cost is low, and the resistivity (ρ), mechanical and thermal properties can be adjusted in a wide range, it occupies an important position in the global conductive polymer material market. It is widely used in energy, optoelectronic devices, electromagnet...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08L25/06C08L33/12C08K9/04C08K9/06C08K3/04C08F292/00C08F212/08C08F220/14
Inventor 方立骏侯世杰江平开
Owner SHANGHAI JIAO TONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com