Conductive polymer composite material with continuous isolation structure and preparation method thereof

A technology of conductive polymer and composite material, applied in the field of conductive polymer composite material with continuous isolation structure and its preparation, can solve the problem of poor mechanical properties such as rigidity and toughness, limiting the application of conductive polymer materials, and poor mechanical properties of conductive materials. and other problems, to achieve the effect of high modulus, good comprehensive performance and high conductivity

Active Publication Date: 2017-09-01
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as weak interfacial adhesion and defects between the conductive particles and the polymer matrix, the mechanical properties of the conductive materials obtained by these methods are very poor, especially for materials with isolated structures, their rigidity, toughness, etc. Very poor mechanical properties
This problem greatly limits the industrial application of conductive polymer materials. Therefore, it is necessary to construct a new type of conductive polymer composite material with low percolation, high electrical conductivity and good mechanical properties.

Method used

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  • Conductive polymer composite material with continuous isolation structure and preparation method thereof
  • Conductive polymer composite material with continuous isolation structure and preparation method thereof
  • Conductive polymer composite material with continuous isolation structure and preparation method thereof

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preparation example Construction

[0044] The second technical problem to be solved in the present invention is to provide the preparation method of the above-mentioned conductive polymer composite material, which includes the following steps:

[0045] Step 1. Using two polymers that can form a co-continuous structure as a matrix, and using conductive particles that can be selectively dispersed in one of the polymer phases as a filler, the three are melt blended to obtain a double percolation Structural conductive composite samples;

[0046] Step 2. Use a specific solvent to selectively dissolve the one-phase polymer containing nanoparticles in the sample obtained in step 1, and then remove the solvent at a certain rate, and the nanoparticles are deposited on the surface of the remaining holes during the solvent removal process. , to obtain a porous material containing a conductive filler;

[0047] Step 3: Pressing the porous material obtained in Step 2 at a certain temperature with a certain pressure for a cert...

Embodiment 1

[0051] Embodiment 1PP / CB conductive composite material and preparation thereof

[0052] Polymer 1 is PP, the conductive filler is carbon black, the introduction of polymer 2 is PS, and the mass ratio of PP to PS is 50:50; the preparation method is as follows:

[0053] Step 1. Under the condition of 190°C and 50rpm, in a torque rheometer (XSS-300 type, produced by Shanghai Qingji Mold Factory), first integrate PS with different contents of CB (CB accounts for PP / PS blends) 0, 0.05%, 0.1%, 0.2%, 0.4%, 1%, 2%, 3%, 4%, 5%, 6%) blending for 3min, then adding PP to continue blending for 5min under the same conditions , to obtain a PP / PS / CB ternary blend with a double percolation structure; the SEM image of the obtained ternary blend is shown in figure 1 shown by figure 1 It can be seen that the two phases of PP and PS are continuous structures, and the blend presents a co-continuous structure, in which CB particles are selectively distributed in the PS phase, and there are no CB p...

Embodiment 2

[0056] Embodiment 2PP / MWCNT conductive composite material and its preparation

[0057] Polymer 1 is PP, the conductive filler is multi-walled carbon nanotubes, polymer 2 is introduced as PS, and the mass ratio of PP to PS is 50:50; the preparation method is as follows:

[0058] Step 1. Under the conditions of 190°C and 50rpm, in a torque rheometer (XSS-300, produced by Shanghai Qingji Mold Factory), first integrate PS with different contents of MWCNT (MWCNT accounts for PP / PS blends) 0, 0.05%, 0.1%, 0.2%, 0.4%, 1%, 2%, 3%, 4%, 5%, 6%) blending for 3min, then adding PP to continue blending for 5min under the same conditions , to obtain a PP / PS / MWCNT ternary blend with a double percolation structure, wherein the MWCNT is selectively distributed in PS;

[0059] Step 2. Soak the PP / PS / MWCNT ternary blend obtained in step 1 in xylene for one week to ensure that the PS phase in the sample is completely and selectively dissolved, and then put the sample in an oven and dry it at 80°C...

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Abstract

The invention belongs to the technical field of conducting polymer composites and particularly relates to a conducting polymer composite with a continuous isolation structure and a preparation method of the conducting polymer composite. The conducting polymer composite comprises a polymer 1 and a conductive filler, and has a continuous isolation structure, wherein the continuous isolation structure is that the conductive filler is regularly distributed in the polymer 1 in a three-dimensional network mode formed by particle layers; meanwhile the polymer 1 is cut by the particle layers of the conductive filler but still keeps a continuous structure. The conducting polymer composite with the novel continuous isolation structure has an extremely low conductivity permeation threshold, can have high conductivity when the content of the conductive filler is very low, meanwhile can further have high modulus, strength and toughness, and has good comprehensive performance.

Description

[0001] Technical field: [0002] The invention belongs to the field of conductive polymer composite materials, and in particular relates to a conductive polymer composite material with a continuous isolation structure and a preparation method thereof. [0003] Background technique: [0004] In recent years, conductive polymer composites have been widely used in static dissipation, electromagnetic shielding, electronic sensors, and capacitors because of their advantages such as low density, easy processing, solvent resistance, and adjustable conductivity. However, in order to obtain conductive polymer composites with high conductivity, it is usually necessary to add a large amount of conductive fillers, and a large amount of conductive fillers will increase the cost of the molding process and greatly reduce the mechanical properties of the material. Therefore, there are currently two main problems in the design of conductive polymer composites: how to reduce the conductive perco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L25/06C08K3/04C08K7/24C08L23/08C08L71/02C08J9/26H01B1/24
CPCC08J9/26C08J2201/042C08J2201/0422C08J2323/08C08J2323/12C08K3/04C08K7/24C08K2201/001C08K2201/011C08L23/0815C08L23/12C08L25/06C08L71/02H01B1/24
Inventor 杨伟龚涛刘梦琦包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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