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Polylactic acid/ MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and application of polylactic acid/ MWCNT sensitive material

A technology of multi-walled carbon nanotubes and sensitive materials, applied in the field of functional polymer materials, can solve the problems of high filling amount of carbon nanotubes and low detection limit, achieve fast response and recovery performance, less filling amount, good repeatability and stability sexual effect

Inactive Publication Date: 2016-06-15
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of high filling amount of carbon nanotubes and low detection limit in the existing polymer / conductive carrier composite conductive system, and provide a kind of material with low percolation threshold and low detection limit High-molecular-weight polylactic acid / multi-walled carbon nanotube sensitive material, and its application in the detection of volatile organic solvent vapor

Method used

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  • Polylactic acid/ MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and application of polylactic acid/ MWCNT sensitive material
  • Polylactic acid/ MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and application of polylactic acid/ MWCNT sensitive material
  • Polylactic acid/ MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and application of polylactic acid/ MWCNT sensitive material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 2.5mg of multi-walled carbon nanotubes and 5mL of dichloromethane into a 50mL round bottom flask, ultrasonically disperse evenly, then add 97.5mg of polylactic acid with a number average molecular weight of 80,000g / mol, stir and compound at 50°C for 24 hours, and form a uniform The dispersion, that is, the polylactic acid / multi-walled carbon nanotube sensitive material is obtained, and its dispersion stability is very good. The light transmittance is basically unchanged after being placed at room temperature for 30 days or centrifuged at a speed of 4000 rpm for 80 minutes.

Embodiment 2

[0026] In Example 1, the polylactic acid with a number average molecular weight of 80000g / mol is replaced by polylactic acid with an equal mass number average molecular weight of 50000g / mol, and the other steps are the same as in Example 1 to obtain polylactic acid / multi-walled carbon nanotubes sensitive material.

Embodiment 3

[0028] In Example 1, the polylactic acid with a number average molecular weight of 80000g / mol is replaced by polylactic acid with an equal mass number average molecular weight of 160000g / mol, and the other steps are the same as in Example 1 to obtain polylactic acid / multi-walled carbon nanotubes sensitive material.

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Abstract

The invention discloses a polylactic acid / MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and an application of the polylactic acid / MWCNT sensitive material. The sensitive material is a homogenously dispersed body prepared from high-molecular-weight polylactic acid as a matrix and MWCNTs as a conductive current carrier through stirring and compounding at 40-50 DEG C with a simple and low-cost solution mixing technology, wherein polylactic acid accounts for 95.0wt%-97.5wt%, and the MWCNTs account for 2.5wt%-5.0wt%. Due to the strong steric hindrance action of high-molecular-weight polylactic acid and the good self-organization action of the high-molecular-weight polylactic acid on the surfaces of the CNTs, the sensitive material has good dispersibility, and the percolation threshold is as low as 2.9wt%; a composite film sensing element with smooth surface can be assembled conveniently from the sensitive material and is applied to chloroform vapor detection, the sensitive material has higher response intensity, rapid response and recovery performance and good repeatability and stability, and the limit of detection of chloroform vapor is as low as 10 ppm. The sensitive material can be taken as a novel gas sensor for rapid detection of indoor and outdoor environmental gas.

Description

technical field [0001] The invention belongs to the technical field of functional polymer (composite) materials, in particular to a polylactic acid / multi-wall carbon nanotube sensitive material with low percolation threshold and low detection limit and its application. Background technique [0002] In recent years, sensitive conductive polymer composites (SCPCs) have received extensive attention due to their ability to sense external environmental stimuli, such as temperature, tension, and volatile organic compounds (VOCs). They are widely used as self-regulating heating cables, overcurrent protectors (PolySwitch) and chemical gas sensors (B.Kumar, M.Castro, J.F.Fell, Carbon50 (2012) 3627–3634; P.Pissis, G.Georgousis, C. Pandis, M. Omastová, Procedia Eng. 114 (2015) 590–597; T. Villmow, S. Pegel, A. John, R. Rentenberger, P. Mater Today 14 (2011) 340–345). In particular, with the development of modern civilization, human beings are increasingly concerned about their livin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K7/24G01N27/12
CPCC08K7/24C08K2201/001C08K2201/011G01N27/126G01N27/127C08L67/04
Inventor 罗延龄魏雪鹏徐峰
Owner SHAANXI NORMAL UNIV
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