Electrical Conductivity Enhancement of Polymer/Multiwalled Carbon Nanotube (MWCNT) Composites by Thermally-Induced Defunctionalization of MWCNTs

2011 ◽  
Vol 3 (7) ◽  
pp. 2204-2208 ◽  
Author(s):  
Chia-Ming Chang ◽  
Ying-Ling Liu
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Thermally Induced ◽  
Conductivity Enhancement

Investigation of the Crack Propagation Behavior of the Multiwalled Carbon Nanotube/Graphite/Natural Rubber Hybrid Nanocomposites Using Digital Image Correlation Technique

2019 ◽  
Vol 14 (12) ◽  
pp. 1766-1770
Author(s):  
Hasan Kasim ◽  
Ahmad Naser Aldeen ◽  
Yücel Can ◽  
Murat Yazici
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Digital Image Correlation ◽  
Crack Propagation ◽  
Natural Rubber ◽  
Digital Image ◽  
Multiwalled Carbon Nanotube ◽  
Hybrid Nanocomposites ◽  
Image Correlation ◽  
Multiwalled Carbon

In the presented study, a hybrid Natural Rubber (NR) based semiconductive nanocomposites was examined to obtain better electrical and mechanical properties. The hybrid nanocomposite produced by incorporation of the Multiwalled Carbon Nanotube (MWCNT) and graphite nanoparticles into the NR. The conventional curing additives also included in the compound. A functionalized MWCNT (1, 2 and 3 phr's) with 3 phr graphite quotas were studied to produce the NR nanocomposites. The MWCNT/Graphite and NR mixed homogeneously to advance the interfacial interaction with the matrix. The graphite nano-particulates added to obtain 3D electrical connectivity network in the hybrid nanocomposites by becoming bridging points between multiwalled carbon nanotubes. Nanocomposites were produced as 3 mm sheets in a steel mold by vulcanizing at 165 °C for 10 min under pressure. The single-edge notched tension specimens were subjected to estimate crack propagation and electrical resistance relation. Digital Image Correlation (DIC) technique was used to observe the crack resistivity function. The results evaluated to clarify the relationship between crack length, MWCNT filler ratio, and electrical conductivity properties. MWCNTs are generally preferred as the reinforcements for their very high aspect ratio and excellent specific surface area properties. However, the electrical conductivity of the nanocomposites is owing to the constitution of a continuous conductive 3D network of MWCNT and Graphite in the NR matrix.

Effect of PA6T on morphology and electrical conductivity in PA66/PA6T/PPE/multiwalled carbon nanotube nanocomposites

2018 ◽  
Vol 164 ◽  
pp. 260-266 ◽  
Author(s):  
Minho Lee ◽  
Kwonsang Son ◽  
Jeongyup Kim ◽  
Donghyeon Kim ◽  
Byong Hun Min ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon

scholarly journals 3D Printed Thermoelectric Polyurethane/Multiwalled Carbon Nanotube Nanocomposites: A Novel Approach towards the Fabrication of Flexible and Stretchable Organic Thermoelectrics

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2879 ◽  
Author(s):  
Lazaros Tzounis ◽  
Markos Petousis ◽  
Sotirios Grammatikos ◽  
Nectarios Vidakis
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Seebeck Coefficient ◽  
Morphological Characteristics ◽  
Multiwalled Carbon Nanotube ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
Fused Deposition ◽  
3D Printed

Three-dimensional (3D) printing of thermoelectric polymer nanocomposites is reported for the first time employing flexible, stretchable and electrically conductive 3D printable thermoplastic polyurethane (TPU)/multiwalled carbon nanotube (MWCNT) filaments. TPU/MWCNT conductive polymer composites (CPC) have been initially developed employing melt-mixing and extrusion processes. TPU pellets and two different types of MWCNTs, namely the NC-7000 MWCNTs (NC-MWCNT) and Long MWCNTs (L-MWCNT) were used to manufacture TPU/MWCNT nanocomposite filaments with 1.0, 2.5 and 5.0 wt.%. 3D printed thermoelectric TPU/MWCNT nanocomposites were fabricated through a fused deposition modelling (FDM) process. Raman and scanning electron microscopy (SEM) revealed the graphitic nature and morphological characteristics of CNTs. SEM and transmission electron microscopy (TEM) exhibited an excellent CNT nanodispersion in the TPU matrix. Tensile tests showed no significant deterioration of the moduli and strengths for the 3D printed samples compared to the nanocomposites prepared by compression moulding, indicating an excellent interlayer adhesion and mechanical performance of the 3D printed nanocomposites. Electrical and thermoelectric investigations showed that L-MWCNT exhibits 19.8 ± 0.2 µV/K Seebeck coefficient (S) and 8.4 × 103 S/m electrical conductivity (σ), while TPU/L-MWCNT CPCs at 5.0 wt.% exhibited the highest thermoelectric performance (σ = 133.1 S/m, S = 19.8 ± 0.2 µV/K and PF = 0.04 μW/mK2) among TPU/CNT CPCs in the literature. All 3D printed samples exhibited an anisotropic electrical conductivity and the same Seebeck coefficient in the through- and cross-layer printing directions. TPU/MWCNT could act as excellent organic thermoelectric material towards 3D printed thermoelectric generators (TEGs) for potential large-scale energy harvesting applications.

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