Abstract
In order to achieve simultaneous enhancement of mechanical and damping properties, epoxy resin nanocomposites reinforced with a series of carboxylic multi-walled carbon nanotubes (C-MWCNTs) with different dimensions were prepared. A solution-based high-speed shear dispersion method was developed. The dispersion mechanism of carbon nanotubes was studied, and the degree of dispersion difficulty of carbon nanotubes with different dimensions was evaluated by theoretical calculation, and the minimum size of agglomerates for dispersion based on the mechanism of rupture was deduced. Then, the effect of synchronous enhancement on the mechanical and damping properties was tested by experiment. The effects of dimensions and agglomerations on the tensile properties, damping properties, and glass transition temperature (Tg) of the nanocomposites were investigated. The ranking of dispersion difficulty was verified using the deviations between predicted and experimental tensile modulus. The experimental results showed that the effects of synchronous enhancement on the mechanical properties and damping capacity of two kinds of specimens were remarkable and the only drawback was that their Tg showed the maximum decrease. Further studies indicated that C-MWCNTs with large aspect ratios and large specific surface areas possessed better effects on synchronous enhancement, but caused a decrease in the glass transition temperature, while agglomeration had the opposite effect. The results of this work would be helpful for preparing improved structural damping integrated composites.
Highlights
Due to the widespread use of composite materials in aerospace, automobile, and other fields, their vibration and noise reduction performance is becoming more and more important
The results showed that the properties of multi-walled carbon nanotubes (MWCNTs)/epoxy nanocomposites with good dispersion were superior to the nanocomposites with poor dispersion
It was found that the larger agglomerates in the three kinds of MWCNTs were composed of smaller agglomerates
Summary
Due to the widespread use of composite materials in aerospace, automobile, and other fields, their vibration and noise reduction performance is becoming more and more important. For the damping integration of composite structure, the filler should be able to simultaneously improve the mechanical properties and damping properties of the matrix, without affecting the light weight of the composite material. % of MWCNTs. In terms of damping properties, Xu et al [10] found that, compared with silicone rubber, carbon nanotubes had excellent viscoelasticity properties over a wide range of temperatures. In terms of damping properties, Xu et al [10] found that, compared with silicone rubber, carbon nanotubes had excellent viscoelasticity properties over a wide range of temperatures They produced more energy dissipation than silicone rubber under the conditions of periodic strain. Nanometer-sized carbon nanotubes (CNTs) could increase the interfacial area dramatically between fillers and the polymer matrix. Multi-walled carbon nanotubes (MWCNTs) show the potential to synchronously enhance the mechanical properties and damping properties of the polymer matrix
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