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Method for preparing polyacrylonitrile/carbon nano tube composite material by taking ionic liquid as solvent

A carbon nanotube composite and carbon nanotube technology, which is applied in the direction of single-component synthetic polymer rayon, conductive/antistatic filament manufacturing, fiber chemical characteristics, etc., can solve low efficiency, cumbersome preparation process, carbon nanotube Poor dispersibility and other problems, to achieve the effect of simple preparation method, enhanced dispersion effect, improved mechanical properties and electrical conductivity

Inactive Publication Date: 2010-10-20
DONGHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The present invention utilizes the characteristics of high viscosity of ionic liquid and strong interaction with carbon nanotubes, adopts the in-situ polymerization method to prepare polyacrylonitrile / carbon nanotube composite materials, and overcomes the poor dispersion of carbon nanotubes in the above-mentioned solution blending method. The disadvantages of cumbersome preparation process and low efficiency

Method used

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  • Method for preparing polyacrylonitrile/carbon nano tube composite material by taking ionic liquid as solvent
  • Method for preparing polyacrylonitrile/carbon nano tube composite material by taking ionic liquid as solvent

Examples

Experimental program
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Embodiment 1

[0032] (1) the diameter is 0.75nm, the length is 1 μ m, the purity is 90%, and the single-walled carbon nanotubes accounting for monomer mass percentage are 0.1% are added in the ionic liquid 1-butyl-3-methylimidazolium chloride, A suspension composed of carbon nanotubes and ionic liquids was obtained by ultrasonic dispersion, and the settling time of carbon nanotubes at room temperature was 16 days.

[0033] (2) Acrylonitrile and azobisisobutyronitrile are added successively to the suspension formed by carbon nanotubes and ionic liquids, and mixed uniformly; the mass concentration of acrylonitrile in 1-butyl-3-methylimidazolium chloride The mass percentage of azobisisobutyronitrile relative to acrylonitrile is 0.5%. Under normal pressure, the temperature was raised to 55° C., and the reaction was carried out for 3 hours. The monomer conversion rate was 71%, and the polyacrylonitrile / carbon nanotube composite stock solution was obtained. The viscosity-average molecular weight ...

Embodiment 2

[0036] (1) adding multi-walled carbon nanotubes with a diameter of 20nm, a length of 0.5 μm, a purity of 93%, and a monomer mass percentage of 0.7% to the ionic liquid 1-allyl-3-methylimidazolium bromide , using ultrasonic dispersion to obtain a suspension composed of carbon nanotubes and ionic liquids, the settling time of carbon nanotubes at room temperature is 15 days.

[0037] (2) Add acrylonitrile, acrylamide, and azobisisoheptanonitrile successively to the suspension formed by carbon nanotubes and ionic liquids, and mix uniformly; The mass concentration in the compound is 15%, the mass percentage of acrylonitrile relative to the total monomer is 80%, the mass percentage of acrylamide relative to the total monomer is 20%, and the mass percentage of azobisisoheptanonitrile relative to the total monomer is 0.7 %. Under normal pressure, the temperature was raised to 60°C, and the reaction was carried out for 3.5 hours. The monomer conversion rate was 74%, and the stock solu...

Embodiment 3

[0040](1) A single-walled carbon nanotube with a diameter of 0.8 nm, a length of 2 μm, a purity of 96%, and a percentage of monomer mass of 1% and a diameter of 23 nm, a length of 2 μm, a purity of 95%, and a monomer mass percentage of 95% Multi-walled carbon nanotubes with a percentage of 1% are added to the ionic liquid 1-butyl-3-methylimidazolium bromide, and ultrasonic dispersion is used to obtain a suspension composed of carbon nanotubes and ionic liquid. The sedimentation of carbon nanotubes at room temperature The time is 13 days.

[0041] (2) Acrylonitrile, methyl acrylate, itaconic acid, and dibenzoyl peroxide are successively added to the suspension formed by carbon nanotubes and ionic liquids, and mixed uniformly; the total monomer is in 1-butyl-3- The mass concentration in methyl imidazolium bromide is 25%, the mass percentage of acrylonitrile relative to the total monomer is 80%, the mass percentage of methyl acrylate relative to the total monomer is 17%, the mass...

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Abstract

The invention relates to a method for preparing a polyacrylonitrile / carbon nano tube composite material by taking ionic liquid as a solvent. The method comprises the following steps of: dispersing carbon nano tubes to the ionic liquid; adding monomers and an initiator into the ionic liquid for polymerizing to obtain stock solution of the polyacrylonitrile / carbon nano tube composite material; and obtaining the polyacrylonitrile / carbon nano tube composite material by washing and drying the obtained stock solution. The polyacrylonitrile / carbon nano tube composite material is prepared into a polyacrylonitrile / carbon nano tube composite membrane by adopting a coating method or is prepared into polyacrylonitrile / carbon nano tube composite fibers by adopting a wet spinning process or a dry-jet wet spinning process. The adopted solvent ionic liquid can make the carbon nano tubes disperse uniformly, and has no volatility and environmental-friendliness. In the preparation method, an in-site polymerization method is adopted, so the preparation method is simple and convenient to operate. The composite material can be used in the fields such as the enhancement, the conductivity, the anti-static property, the electromagnetic shielding and the like of a material.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials, in particular to a method for preparing polyacrylonitrile / carbon nanotube composite materials by using ionic liquid as a solvent. Background technique [0002] Polyacrylonitrile / carbon nanotube composite material is one of the emerging composite materials in recent years. Due to the addition of carbon nanotubes, the mechanical properties, electrical properties, and thermal properties of polyacrylonitrile / carbon nanotube composites are greatly improved compared with polyacrylonitrile. The composite material has broad application prospects in aerospace, textile, automobile and other fields. [0003] The preparation methods of polyacrylonitrile / carbon nanotube composites usually adopt solution blending method and in-situ polymerization method. The solution blending method is simple and easy, but it is difficult to achieve uniform dispersion of carbon nanotubes in high-viscosity pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/44C08F220/44C08F220/48C08F220/46C08F2/44C08K7/00C08K3/04C08L33/20D01F6/54D01F1/09
CPCY02P20/54
Inventor 张玉梅薛明丁璇朱新军王彪王华平
Owner DONGHUA UNIV
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