Method for preparing PMMA (polymethyl methacrylate)/CNTs (carbon nanotubes) composite materials

Abstract

The invention provides a method for preparing PMMA (polymethyl methacrylate) / CNTs (carbon nanotubes) composite materials. The method includes: preparing surface-modified carbon nanotubes from carbon nanotubes and auxiliaries such as organosilicon compounds, polycarboxylate, polyoxyethylene ether and acrylic resin under certain conditions by a physical blending process; adding the surface-modified carbon nanotubes and initiators into methyl methacrylate matrixes; uniformly dispersing the carbon nanotubes, the initiators and the methyl methacrylate matrixes to obtain mixtures and polymerizing the mixtures by means of standing under low-temperature conditions to obtain the PMMA / CNTs composite materials. The method has the advantages that monomer MMA (methyl methacrylate) is polymerized in a standing state under the effect of ultrasonic waves and the joint effects of the carbon nanotubes (CNTs) and the initiators at the low polymerization temperatures of 15-80 DEG C; reaction conditions are mild, surface chemical modification by the aid of strong oxidizing agents such as strong acid can be omitted, polymerization reaction can be carried out at the low temperatures, the method is low in energy consumption, technological conditions are simple, and operation is easy to implement; self-acceleration and implosion phenomena can be prevented in reaction procedures, the reaction procedures are stable and mild, the surfaces of products obtained by the aid of the method are smooth and flat, the carbon nanotubes are excellently dispersed, and the glass-transition temperatures of the obtained PMMA is increased.

Description

technical field [0001] The invention belongs to the technical field of polymer-based nanocomposite materials, and in particular relates to a preparation method of PMMA / CNTs composite materials. Background technique [0002] Carbon nanotubes are single-layer or multi-layer nanoscale tubular materials mainly composed of carbon hexagons, carbon pentagons and carbon heptagons at the bends, and are formed by the strongest c-c covalent bonds in nature. Therefore, it has very high strength, the theoretical value is more than 100 times that of steel and nearly 20 times that of carbon fiber, and it also has high toughness, hardness, thermal conductivity and electrical conductivity. [0003] Because carbon nanotubes have very high strength, and are resistant to strong acids and alkalis, they are basically not oxidized below 600°C, and have nanoscale sizes. If they are combined with engineering materials, they can play a strengthening role. Therefore, the research on carbon nanotube c...

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Problems solved by technology

[0007] The purpose of the present invention is to address the above-mentioned surface chemical modification of carbon nanotubes that may damage their intrinsic properties, poor dispersion of carbon nanotubes in polymer matrix and bulk polymerization of carbon nanotubes-methyl methacrylate material system Susceptible to problems such as violent polymerization that have a negative impact on the performance of composite materials, and provide a preparation method for PMMA / CNTs composite materials

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