Method for preparing water-soluble cross-linked polymer grafted carbon nano tube

Abstract

The invention discloses a method for preparing a water-soluble cross-linked polymer grafted carbon nano tube, which comprises the following steps: adding a carbon nano tube, a polymerizable macromolecular surfactant, a vinyl monomer and an initiator dispersed in an organic solvent into water, and ultrasonically oscillating or stirring the mixture to form stable suspension; and under the atmosphere of nitrogen, heating and reacting the obtained suspension or irradiating the obtained suspension with gamma rays so as to produce free radical polymerization between the polymerizable macromolecular surfactant and the vinyl monomer, centrifuging or filtering the suspension, and drying the centrifuged or filtered product to obtain the water-soluble cross-linked polymer grafted carbon nano tube. The preparation method of the invention is simple, does not need strong acid and strong alkali during the preparation, has mild reaction process, and is easy in scale production. Because the molecule of the polymerizable macromolecular surfactant contains over one double-bond which can directly participate in the polymerization reaction so that a polymer coating produces chemical crosslinking and is grafted to the surface of the carbon nano tube, the polymer coating has quite good structural stability; and the method of the invention can prepare the polymer modified carbon nano tube with good water solubility and quite stable structure.

Description

technical field The invention relates to a preparation method of a water-soluble cross-linked polymer grafted carbon nanotube, which belongs to the technical field of nanometer materials. Background technique Carbon nanotubes are nanomaterials with high mechanical properties and electrical and thermal conductivity, so they are expected to be used as new additives for polymer composites to improve the mechanical properties of polymer composites or endow them with good electrical and thermal properties. However, as an ideal composite material additive, carbon nanotubes must be well dispersed in polymer materials in order to give full play to their properties. The more mature chemical modification methods of carbon nanotubes include strong acid oxidation, 1,3-dipolar cycloaddition, azide compound addition, Friedel-Crafts acylation reaction and free radical addition reaction. Among them, the chemical oxidation method is to introduce chemical groups such as carboxyl and hydroxy...

AI Technical Summary

Problems solved by technology

This kind of physical modification method has been widely reported. However, compared with the chemical modification method, the disadvantage of the physical modification method is also obvious, that is, the structure of the micelles-coated carbon nanotubes is very unstable. The structure is changed or even completely destroyed when drying, so its application range is limited

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