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Process for preparing multifunctional carbon nanotube for epoxy resin nano composites

A technology of nanocomposite materials and carbon nanotubes, which is applied in the field of nanomaterials, can solve problems such as lack of uniform dispersion at the nanoscale, low two-phase interface strength, and lack of chemical bonds, so as to facilitate industrial applications, improve processability, The effect of the simple and easy preparation method

Inactive Publication Date: 2006-10-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the extremely high surface energy of CNTs, the huge van der Waals force between the tubes makes it easy to aggregate into bundles, and it is almost insoluble in any solvent, so it is difficult to disperse into the composite material matrix or various application systems, which is the limitation. The bottleneck of carbon nanotube application
Therefore, the existing preparation process cannot prepare nanocomposites in the true sense, because ① the carbon nanotubes cannot be uniformly dispersed at the nanometer level in the polymer; ② the interface between the polymer and the carbon nanotubes lacks chemical bonding, and the two-phase Low interface strength
Therefore, the performance of existing polymer / carbon nanotube composites is much lower than expected

Method used

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  • Process for preparing multifunctional carbon nanotube for epoxy resin nano composites
  • Process for preparing multifunctional carbon nanotube for epoxy resin nano composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Multi-walled carbon nanotubes (OD<8nm) prepared by chemical vapor deposition are used as the initial raw material. After purification, acidification, and acyl chlorination, after being connected with dodecyl diamine, the surface containing dodecane Amine-grafted carbon nanotubes.

[0023] Step (1): In a 250ml single-necked round-bottomed flask equipped with mechanical stirring, add 2g of multi-walled carbon nanotube raw material and 100mL, 20% weight concentration nitric acid solution, process under 40kHz ultrasonic waves for 24 hours, then heat to 50 ℃, reacted for 30 hours, filtered with 0.45 μm polytetrafluoroethylene microfiltration membrane, washed 3-6 times with deionized water until neutral, and vacuum dried at 80℃ for 24 hours to obtain purified carbon nanotubes;

[0024] Step (2): In the 250mL single-necked round-bottomed flask equipped with a magnetic stirring rotor, add the purified carbon nanotube raw material 2g and 100mL obtained in step (1), 60...

Embodiment 2

[0029] Example 2: The single-walled carbon nanotube (OD<8nm) prepared by the arc discharge method is used as the initial raw material, and after purification, acidification, and acid chloride, N,N-dimethyldipropyltriamine is connected to obtain Grafted single-walled carbon nanotubes with amino groups on the surface.

[0030] Step (1): In a 250ml single-necked round-bottomed flask equipped with mechanical stirring, add 1g of single-walled carbon nanotube raw material and 200mL of sulfuric acid with a concentration of 30% by weight, use 80kHz ultrasonic treatment for 12 hours, and then heat to 80°C , reacted for 10 hours, filtered with a 0.45 μm polyvinylidene fluoride microfiltration membrane, washed repeatedly with deionized water until neutral, and vacuum dried at 100°C for 18 hours to obtain purified carbon nanotubes;

[0031] Step (2): In the 250mL single-necked round-bottomed flask equipped with a magnetic stirring rotor, add 1.5g and 150ml of the purified carbon nanotube ...

Embodiment 3

[0035] Example 3: Multi-walled carbon nanotubes (OD<8nm) prepared by laser evaporation as the initial raw material, after purification, acidification, and acyl chlorination, are connected with dodecyl diamine to obtain a bond with amino groups on the surface. branched multi-walled carbon nanotubes.

[0036] Step (1): In a 250ml single-neck round bottom flask equipped with mechanical stirring, add 1g of multi-walled carbon nanotube raw material and 100mL of 20% weight concentration sulfuric acid solution, use 80kHz ultrasonic treatment for 10 hours, then heat and heat at 80-90 Stir and reflux at ℃, react for 10 hours, filter with 0.45 μm polytetrafluoroethylene microfiltration membrane, wash repeatedly with deionized water 3-5 times until neutral, and dry under vacuum at 100 ℃ for 24 hours to obtain purified carbon nanotubes ;

[0037] Step (2): In a 250mL single-necked round bottom flask equipped with a magnetic stirring rotor, add 2g of purified carbon nanotube raw material ...

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Abstract

The invention belongs to the nano-material technical sphere, especially it relates to a method for preparation of triplefunction carbon nano-tube used in epoxide resin nano-recombination. The invention adopts molecular design conception, namely that after the suface-definite quantity carboxylation and chloridization, the long-chain diamine with a character construction is introduced into the purified carbon nano-tube, then the grafted carbon nano-tube with a quantitative active amidol on surface is obtained. Making use of the chemical attraction of the construction to the base resin and the chemical reaction with the base resin, we can better the dispersibility of the carbon nano-tube and improve the basal binding strength with the base resin. At the same time the carbon nano-tube can exert multiple functions, for example, it is easy to disperse, its interfacial caking capacity is fine, and it is reinforced and solidified. So the obtained triplefunction carbon nano-tube used in epoxide resin nano-recombination is good to improve the bulk property of the carbon nano-tube / epoxide resin composite and is suitable for industrial use for carbon nano-tube.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing multifunctional carbon nanotubes for epoxy resin nanocomposite materials. Background technique [0002] Since carbon nanotubes (CNTs) were discovered by Japanese scholar Iijima in 1991, with their unique mechanical, electrical and chemical properties, unique quasi-one-dimensional tubular molecular structure and many potential applications in the future high-tech fields, It has quickly become a research hotspot in the fields of chemistry, physics and material science. [0003] CNTs have a large aspect ratio, generally greater than 1000. The Young's modulus of CNTs is the same as that of diamond, and the theoretical strength can reach 1.0TPa, which is 100 times that of steel; the theoretical calculation value of the tensile strength of carbon nanotubes is as high as 177GPa, which is much higher than that of carbon fibers (2GPa~5GPa), ...

Claims

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Application Information

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IPC IPC(8): C08K3/04C01B31/02C08L63/00
Inventor 邱军王国建
Owner TONGJI UNIV
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