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Cellulose-based gas-sensitive conductive composite material and preparation method thereof

A conductive composite material and composite material technology, applied in the field of cellulose-based gas-sensitive conductive composite material and its preparation, can solve problems such as low percolation value, achieve low percolation value, high sensitivity, high stability and repeatability usability effect

Active Publication Date: 2015-09-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Gas-sensing materials based on synthetic polymers have low percolation values, thus having good electrical conductivity and good mechanical properties, while gas-sensing conductive composite materials based on natural cellulose have rarely been reported.

Method used

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  • Cellulose-based gas-sensitive conductive composite material and preparation method thereof
  • Cellulose-based gas-sensitive conductive composite material and preparation method thereof
  • Cellulose-based gas-sensitive conductive composite material and preparation method thereof

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Embodiment Construction

[0026] The ratio table 1 of embodiment 1~5, its preparation method concrete steps are as follows:

[0027] ①Heat and reflux the conductive filler at 120°C for 4 hours with concentrated nitric acid, then place it in a sodium dodecylsulfonate-ethanol (4% sodium dodecylsulfonate) solution and heat and stir at 70°C 90min, and finally washed with distilled water to neutrality and then placed in a desiccator for later use;

[0028] ②Add 0.0175g of chitosan to 1g of ionic liquid, blow in nitrogen and heat and stir in an oil bath at a temperature of 100°C. After 3, add cotton fibers in batches;

[0029] ③After the above substances are completely dissolved (about 1h), add conductive filler with a mass fraction of 1.1% according to the calculated amount, and continue stirring with nitrogen gas for 10min;

[0030] ④ Apply the sticky substance obtained on a glass electrode plate, wash the deionized liquid with deionized water, and vacuum-dry it at 80°C for 10 minutes to obtain a composit...

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Abstract

The invention relates a cellulose-base gas-sensitive conductive composite material and a preparation method thereof. The composite material comprises a natural cellulose matrix, a chitosan matrix and powder conductive stuffing; cotton fibers are adopted as the matrix, a macromolecular chain of the matrix contains a great quantity of hydroxyl radicals which are easy to form the hydrogen bond combination with a polar organic solvent, and the composite material has strong gas-sensitivity to the polar organic solvent. Natural cellulose fibers are used as the matrix to be doped with a small amount of chitosan and the conductive stuffing, when under the atmosphere with a plurality of polar organic solvents, the resistance of the composite material can be changed rapidly, and the gas sensitivity to non-polar organic solvent gas is poor. A final product of the composite material is toxic-free, odorless and free from polluting the environment. The composite material also has high stability and reusability and can be used as a base material for manufacturing gas-sensitive components and parts.

Description

technical field [0001] The invention relates to a composition and a manufacturing method of a conductive polymer composite material with high gas-sensitivity properties prepared by filling a natural cellulose matrix with a conductive filler. Background technique [0002] The gas-sensitive conductive polymer composite material composed of conductive fillers (such as carbon nanotubes, etc.) filled with cellulose matrix has adjustable conductivity in a wide range, easy molding and processing, low cost and high gas sensitivity. features. Its working principle is: the composite material is placed in some organic solvent gas, and the solvent vapor quickly enters the material. The above four polar solvents can form hydrogen bonds with cellulose, resulting in the hydrogen bond between cellulose and carbon nanotubes. The bond will be destroyed, replaced by the formation of intermolecular hydrogen bonds between cellulose and solvent molecules, so that the interaction between carbon n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08L5/08C08K9/04C08K9/02C08K7/00C08K3/04
Inventor 李军荣刘凯华何北海蔡平曹镛
Owner SOUTH CHINA UNIV OF TECH
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