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Ternary conductive gas-sensitive sensing material adopting polymers, compatilizer and multiwalled carbon nanotubes as well as preparation method and application of ternary conductive gas-sensitive sensing material

A technology of multi-walled carbon nanotubes and gas-sensing sensing materials, applied in the direction of material resistance, can solve the problems of unstable electrical conductivity of composite materials, easy agglomeration of carbon nanotubes, poor sensing responsiveness, etc., and achieve good dispersion stability. , good stability and high response sensitivity

Inactive Publication Date: 2015-04-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing polymer / conductive carrier composite conductive system, such as easy agglomeration and poor dispersion of carbon nanotubes, unstable electrical conductivity of composite materials, and poor sensory responsiveness, etc., to provide a Polymer / compatibilizer / multi-walled carbon nanotube ternary conductive gas-sensitive sensing material with good conductivity and high response characteristics, and its preparation method and application in sensing and detecting organic gases

Method used

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  • Ternary conductive gas-sensitive sensing material adopting polymers, compatilizer and multiwalled carbon nanotubes as well as preparation method and application of ternary conductive gas-sensitive sensing material
  • Ternary conductive gas-sensitive sensing material adopting polymers, compatilizer and multiwalled carbon nanotubes as well as preparation method and application of ternary conductive gas-sensitive sensing material
  • Ternary conductive gas-sensitive sensing material adopting polymers, compatilizer and multiwalled carbon nanotubes as well as preparation method and application of ternary conductive gas-sensitive sensing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Preparation of multi-walled carbon nanotube grafted poly(styrene-tert-butyl methacrylate) copolymer

[0052] according to figure 1 The synthetic route of 2g carboxylated multi-walled carbon nanotubes (MWNTs-COOH), 25mL thionyl chloride (SOCl 2 ) into a 250mL single-necked round-bottomed flask, then dropwise added 0.2mL N,N-dimethylformamide, stirred in an ice bath for 0.5 hours, then stirred at 65°C for 24 hours, cooled, washed with tetrahydrofuran, and rotated Evaporation and vacuum drying at 50°C for 24 hours yielded 2.36 g of acyl chloride multi-walled carbon nanotubes (MWNTs-COCl).

[0053] Take 1.8g of acid chloride multi-walled carbon nanotubes (where the acid chloride group is 0.63mmol) and suspend and disperse them in 20mL of anhydrous tetrahydrofuran, add 0.43g (2.50mmol) of 4-hydroxy-2,2,6,6-tetramethylpiperene Pyridine-1-oxyl radical (TEMPO) and 2mL triethylamine were ultrasonically dispersed for 2 hours, then stirred and reacted at 60°C for 24 hours und...

Embodiment 2

[0062] The preparation method of multi-walled carbon nanotube grafted poly(styrene-tert-butyl methacrylate) copolymer and poly(styrene-tert-butyl methacrylate) copolymer in this example is the same as that of Example 1. In step 3 of Example 1, 0.25 g of carboxylated multi-walled carbon nanotubes was added into 3 mL of chloroform, ultrasonically dispersed for 2 hours with a 250 W, 45 kHz ultrasonic cleaner, and then 0.05 g of multi-walled carbon nanotubes were added to graft Poly(styrene-tert-butyl methacrylate) copolymer, 0.70g poly(styrene-tert-butyl methacrylate) copolymer were stirred at 60°C for 2 hours to obtain a uniformly dispersed black colloidal suspension, i.e. three Yuandong gas-sensitive sensing materials.

Embodiment 3

[0064] The preparation method of multi-walled carbon nanotube grafted poly(styrene-tert-butyl methacrylate) copolymer and poly(styrene-tert-butyl methacrylate) copolymer in this example is the same as that of Example 1. In step 3 of Example 1, 0.25 g of carboxylated multi-walled carbon nanotubes was added into 3 mL of chloroform, ultrasonically dispersed for 2 hours with a 250 W, 45 kHz ultrasonic cleaner, and then 0.10 g of multi-walled carbon nanotubes were added to graft Poly(styrene-tert-butyl methacrylate) copolymer, 0.65g poly(styrene-tert-butyl methacrylate) copolymer were stirred at 60°C for 2 hours to obtain a uniformly dispersed black colloidal suspension, i.e. three Yuandong gas-sensitive sensing materials.

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Abstract

The invention discloses a ternary conductive gas-sensitive sensing material adopting polymers, compatilizer and multiwalled carbon nanotubes as well as a preparation method and an application of the ternary conductive gas-sensitive sensing material. The ternary conductive gas-sensitive sensing material comprises components in percentage by mass as follows: 5%-72% of multiwalled carbon nanotube grafted poly (styrene-tert-butyl methacrylate) copolymer, 13%-45% of carboxylic multiwalled carbon nanotubes and 10%-80% of poly (styrene-tert-butyl methacrylate) copolymer, wherein the compatilizer is prepared from the multiwalled carbon nanotube grafted poly (styrene-tert-butyl methacrylate) copolymer and the poly (styrene-tert-butyl methacrylate) copolymer with a nitroxide-mediated stable free-radical polymerization method, and the conductive gas-sensitive sensing material is prepared with a solution mixing method. The conductive gas-sensitive sensing material has good dispersion stability, can be used for assembling a gas-sensitive sensing film to detect steam of weak-polar organic solvents such as trichloromethane, dichloromethane and tetrahydrofuran, and has the characteristics of high responding sensitivity, good stability, quick response and the like.

Description

technical field [0001] The invention belongs to the technical field of conductive polymer composite materials and functional materials, in particular to a polymer / multi-walled carbon grafted poly(styrene-tert-butyl methacrylate) copolymer based on a compatibilizer multi-walled carbon nanotube Nanotube conductive composite material and its preparation method and gas sensing application. Background technique [0002] As a device for capturing and converting information, sensors have been widely used in national defense, aerospace, transportation, energy, electric power, machinery, chemical industry, textiles, environmental protection, biomedicine and other fields, and occupy a very important position in modern social science and technology. The sensitive material as the core of the sensor determines the selectivity, sensitivity, linearity, stability, etc. of the sensor. Therefore, the selection and optimization of sensitive materials and the development and application of new...

Claims

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Application Information

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IPC IPC(8): C08L53/00C08L51/10C08K9/04C08K7/24C08F292/00C08F212/08C08F220/18C08F293/00G01N27/12
Inventor 罗延龄曹丹白瑞雪徐峰
Owner SHAANXI NORMAL UNIV
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