Polymer-based carbon nanotube orientation enhanced functional material and its preparation method and device

Abstract

Relating to the technical field of carbon nanotube composite material preparation, the invention provides a polymer-based carbon nanotube orientation enhanced functional material and its preparation method and device. According to the method, a high polymer material, a functional material and multilayer melts from different plasticizing apparatuses are superimposed into one layer by a convergence instrument, the composite melt leaves the convergence instrument and enters a stack orientation die, and the inlet melt entering the stack orientation die is equally divided into m parts along the width direction, each part further flows forward in the stack orientation die, rotates by 90 degrees and is widened by m times, and the thickness is reduced to 1 / m of the original, thus forming branch melts. In the process, due to bidirectional stretching, the high polymer material and the functional material get orientation. And the branch melts mutually converge into an outlet melt of 2*m layers at an outlet end, thus obtaining the composite material formed by alternate stacking of the high polymer material and the functional material. And the composite material has excellent mechanical properties and conductivity.

Description

technical field [0001] The invention relates to the technical field of preparation of carbon nanotube composite materials. Background technique [0002] Since the discovery of carbon nanotubes (CNTs) in 1991, it has rapidly become a chemical, A research hotspot in the field of physics and material science, it is one of the most promising nanomaterials in the 21st century. Carbon nanotubes have a high aspect ratio, generally greater than 1000, have the same thermal conductivity and mechanical properties as diamond, excellent strength, modulus, elongation, bendability and strong acid and alkali resistance, and have nanometer size, Therefore, it can be used as a "super fiber" to strengthen composite materials. The combination of carbon nanotubes and polymers can complement or strengthen the advantages of component materials, and make the most economical and effective use of the unique properties of carbon nanotubes. Polymer-based carbon nanotube composites are used in informa...

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Problems solved by technology

In the composite material obtained by the above preparation method, the carbon nanotubes are uniformly dispersed in the polymer matrix. Although the mechanical properties of the material are improved and a composite material with uniform quality is obtained, the carbon nanotubes do not form a good electrical conductivity. Network, some adjacent carbon nanotubes have large spacing and poor contact with each other, so the excellent electrical conductivity and thermal conductivity of carbon nanotubes cannot be fully utilized, resulting in a great waste of carbon nanotubes and increasing the composite capacity. Cost of materials and finished products

In addition, the traditional preparation methods of polymer-based carbon nanotube composites cannot achieve artificial adjustment and control of the composite microstructure.

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