Improving electrical conductivity of poly methyl methacrylate by utilization of carbon nanotube and CO₂ laser

Abstract

In this work, the electrical surface conductivity enhancement of injection-molded multiwalled carbon nanotube (MWCNT)/poly(methyl methacrylate) (PMMA) nanocomposite by using CO 2 laser processing was studied. Variable input factors are considered as MWCNT concentration (in three levels 0.5, 1, and 1.5 wt %), the laser feed angle with the flow direction (in five levels 08, 308, 458, 758, and 908), and the cavity machining method that were produced by electrodischarge machining and computer numerical control milling with finishing process. The studies show that the irradiation of laser and utilization of covering gas could enhance the CNT-CNT contacts and the surface electrical conductivity. The morphology of laser-irradiated surface by using scanning electron microscope certified that the conductive network generated from CNT-CNT contacts can transfer the electrical current. The findings clearly show that the laser feed angle with the flow direction influenced the electrical conductivity. The maximum conductivity ($ 5.310 3 10 24 S) was observed at 758.

Influence of carbon nanotube surface treatment on resistivity and low‐frequency noise characteristics of epoxy‐based composites

“…Tunneling, transport through defects' centers, and hopping are the most usually observed charge carrier transport mechanisms in composite materials . The dominant mechanism is determined by the type and dimensions of the carbon particles, the distance between them, their orientation and distribution in the matrix . Dependencies of the resistivity on voltage and on temperature have the same character irrespective of CNTs grafting and density of inclusions in the investigated materials.…”

Low Frequency Noise and Resistivity Characteristics of Hybrid Composites with Onion-Like Carbon and Multi-Walled Carbon Nanotubes

“…These unique properties make composites with carbon nanoparticles a promising material that allows development of high-strength and light-weight composite materials. The electrical and electromagnetic properties of composites with carbon nanoparticles strongly depend on the particles' size, their density, distribution and orientation in the matrix [1]. Therefore, there is a possibility to fabricate materials with desired electrical, chemical, thermal and other characteristics [2,3].…”

Acoustic properties of polyurethane compositions enhanced with multi‐walled carbon nanotubes and silica nanoparticles

“…It is specifically critical to enhancing acoustic and mechanical properties of polyurethane in order to use in different applications in addition to its excellent strength-to-weight ratio, resilience, and thermal properties. By means of polymerization reaction of a diisocyanate and polyol in blowing water, polyurethane foam is produced and its properties can be engineered with addition of a certain amount of nanoparticles It is known that carbon nanotubes (CNTs) like materials have been used to improve materials properties of polyurethane foam due to their fibrous properties [1][2][3][4][5][6]. Acoustic damping is significantly enhanced by just adding 0.1 % carbon nanotube into polyurethane foam [7].…”