Method for preparing PMMA (polymethyl methacrylate)/CNTs (carbon nanotubes) composite materials
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A technology of composite materials and carbon nanotubes, which is applied in the field of polymer-based nanocomposites, can solve problems such as poor dispersion, damaged intrinsic properties, and prone to violent polymerization of composite materials, achieving low polymerization reaction temperature and good dispersion , smooth surface effect
Inactive Publication Date: 2017-06-13
GUILIN UNIV OF ELECTRONIC TECH
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[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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Embodiment 1
[0027] A preparation method of PMMA / multi-walled carbon nanotube composite material, specifically comprising the steps of:
[0028] (1) Weigh 20.00g of multi-walled carbon nanotubes (MWCNTs) on an electronic analytical balance, place in a beaker containing 60ml of deionized water, add 0.040g of polycarboxylate, 0.040g of organosiloxane surfactant in turn and 0.040g OP-10 alkylphenol polyoxyethylene ether, after a little stirring, disperse with ultrasonic wave for 60min;
[0029] (2) Add 0.4 g of acrylate resin emulsion obtained by copolymerization of acrylate and styrene into the material system of step (1), and continue to disperse with ultrasonic waves for 60 minutes;
[0030] (3) Place the material obtained in (2) in an oven at 100°C, evaporate and dry the deionized water to obtain a massive solid, which is ground into a powder repeatedly in a mortar after cooling to obtain a powdery surface-modified polysaccharide Walled carbon nanotubes (MWCNTs);
[0031] (4) Preparatio...
Embodiment 2
[0039] A preparation method of PMMA / single-walled carbon nanotubes (SWCNTs) composite material, specifically comprises the steps:
[0040] (1) Weigh 20.00g of single-walled carbon nanotubes on an electronic analytical balance, place them in a beaker filled with 60ml of deionized water, add 0.040g of polycarboxylate, 0.040g of organosiloxane surfactant and 0.040g of OP -10 Alkylphenol polyoxyethylene ether, after a little stirring, disperse with ultrasonic waves for 60 minutes;
[0041] (2) Add 0.4 g of acrylate resin emulsion to the material system of step (1), and continue to disperse with ultrasonic wave for 60 min;
[0042] (3) Place the material obtained in (2) in an oven at 100°C, evaporate and dry deionized water to obtain a massive solid, and after cooling, grind it repeatedly in a mortar to obtain a powdery surface-modified single walled carbon nanotubes;
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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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