Preparation of multi-wall carbon nano-tube / dodecyl sodium sulfonate / polyvinyl alcohol compound film

A technology of sodium dodecyl sulfonate and multi-wall carbon nanotubes is applied in the field of preparation of multi-wall carbon nanotubes/sodium dodecyl sulfonate/polyvinyl alcohol composite films, and can solve the problem of water resistance and heat resistance. problems such as poor, hindered application, etc., to achieve the effect of low cost

Inactive Publication Date: 2009-08-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PVA has shortcomings such as poor water resistance ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) take by weighing 10 grams of PVA solids, slowly add 90 grams of stirring distilled water, gradually heat to 93 ° C, continue to stir until PVA is completely dissolved, then be cooled to room temperature; after filtration, get the supernatant of the filtrate, stand to remove Soak for 24 hours; obtain a PVA aqueous solution A with a weight percentage of about 10 wt%.

[0026] (2) Weigh 1 g of MWCNTs crude product prepared by catalytic cracking of methane, heat at 450-500° C. for 2 hours, and the weight loss rate is about 20 wt%. About 0.8 g of the calcined MWCNTs sample was placed in 100 ml of 4M nitric acid solution, kept at a constant temperature of 80 °C for 4 hours, cooled to room temperature; filtered, and then washed with distilled water until the filtrate became neutral; The filtered product is thoroughly dried to obtain purified MWCNTs with a purity greater than 98 wt%; the purification yield is about 90 wt%.

[0027] (3) Dissolve 0.995 g of SDS in 98.505 g o...

Embodiment 2

[0033] Scrub the glass bottom plate with the solution of ethanol: ether=1:1, dry it, and place it horizontally; On the glass bottom plate, parallel tie the copper enameled wires with a distance of 15 cm and a diameter of 44 microns, and other experimental conditions are the same as in Example 1, and the thickness is obtained. About 40 microns of 0.1 wt% MWCNTs / 0.2 wt% SDS / PVA composite film.

[0034]Mechanical measurements showed a fracture strength of about 64 MPa and a Young's modulus of 1.85 gigapascals (GPa). The electrical measurement results show that its volume resistivity is 2.2×10 13 Ω·m. Thermogravimetric measurement results show that the weight loss rate is 18wt% below 300°C, and 78wt% in the range of 320°C to 480°C; when heated to 700°C, the total weight loss rate is 93wt%. The hydrogen permeability coefficient of the composite film is 2.61mol·cm / min·cm 2 ·kPa. The composite film strip (80 mm in length, 15 mm in width, the same below) was placed in liquid nitro...

Embodiment 3

[0036] Scrub the glass bottom plate with the solution of ethanol: ether=1:1, dry it, and place it horizontally; On the glass bottom plate, the copper enameled wires of 15 cm interval and diameter of 56 microns are bundled in parallel, and other experimental conditions are the same as in Example 1, and the thickness is obtained. About 50 microns of 0.1 wt% MWCNTs / 0.2 wt% SDS / PVA composite film.

[0037] Mechanical measurements showed that the fracture strength was about 70 MPa. The electrical measurement results show that its volume resistivity is 2.1×10 13 Ω·m.

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Abstract

The invention relates to the preparation method of a multi-walled carbon nano-tube/dodecyl sodium sulfate/polyvinyl alcohol coextruded film, which comprises the following steps: distilled water solution A of polyvinyl alcohol with 5-15wt percentage by weight is prepared; distilled water solution of dodecyl sodium sulfate with 1wt percentage by weight is prepared, the purified multi-walled carbon nano-tube is dispersed in the distilled water solution of dodecyl sodium sulfate by a sonic oscillation way to obtain MWCNTs suspending liquid B with the content of 0.1-1 wt percent; the solution A and the suspending liquid B are evenly mixed to obtain mother solution C of MWCNTs/SDS/PVA coextruded film material with the content of 0.1-2 wt percent; and the mother solution C is prepared to the film on clean and dry glass film plates by a scraping way. The MWCNTs crude product is prepared by adopting the method of catalytic pyrolysis methane, thereby having low cost; the main solution is distilled water, thereby having no pollution on environment; the MWCNTs/SDS/PVA coextruded film not only has obviously enhanced mechanical property and electrical property, improved thermal stability and ventilation property, but also has greatly enhanced stability in an ultra-low temperature environment (liquid nitrogen temperature).

Description

technical field [0001] The invention belongs to the technical field of nano-composite film materials, in particular to a preparation method of a multi-wall carbon nanotube / sodium dodecyl sulfonate / polyvinyl alcohol composite film. Background technique [0002] Multi-walled carbon nanotubes (MWCNTs) have excellent mechanical and optical properties as well as good electrical and thermal conductivity; their excellent mechanical properties can well improve the strength and toughness of polymer composites, and at the same time their excellent optical properties A new type of optical polymer composite material can be prepared, and its good electrical conductivity can improve the electrical conductivity of the polymer material, and its good thermal conductivity can improve the thermal stability of the polymer material. The study of MWCNTs / polymer composites has become an important aspect in the field of nanocomposite research. [0003] The preparation methods of MWCNTs / polymer com...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08K3/04C08K5/42
Inventor 崔屾李景庆张娟玲
Owner TIANJIN UNIV
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