scholarly journals A Suggested Vacuum Bagging Process for the Fabrication of Single-Walled Carbon Nanotube/Epoxy Composites That Maximize Electromagnetic Interference Shielding Effectiveness

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1867
Author(s):  
Min Ye Koo ◽  
Hon Chung Shin ◽  
Jonghwan Suhr ◽  
Gyo Woo Lee
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Electromagnetic Interference ◽  
Manufacturing Process ◽  
Skin Depth ◽  
Epoxy Composites ◽  
Temperature Cycle ◽  
Shielding Effectiveness ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

We designed and tested a manufacturing process that resulted in the formation of composites with maximized electrical conductivity and optimized electromagnetic interference (EMI) shielding effectiveness (SE) properties. Single-walled carbon nanotube (SWCNT) paper, which is a microscopic aggregate of van der Waals force interaction, was impregnated with semi-cured epoxy to make SWCNT prepregs. These prepregs were completely cured into SWCNT/epoxy composites. Fabricating and curing processes were executed under proper temperature cycle depending on the time. We inspected SWCNT paper and the interfacial state between the SWCNTs and epoxy in the composite with a field emission-scanning electron microscopy and calculated the SWCNT weight fraction through thermogravimetric analysis measurements. Using these observations, electrical conductivity and EMI SE were investigated according to thickness which could be controlled by the suggested manufacturing process as 1-, 5- and 10-layer composites. Finally, we determined ideal composite thickness and the associated number of prepreg layers using skin depth theory.

Electromagnetic Interference (EMI) Shielding of Single-Walled Carbon Nanotube Epoxy Composites

Nano Letters ◽  
2006 ◽  
Vol 6 (6) ◽  
pp. 1141-1145 ◽  
Author(s):  
Ning Li ◽  
Yi Huang ◽  
Feng Du ◽  
Xiaobo He ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electromagnetic Interference ◽  
Epoxy Composites ◽  
Emi Shielding ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

Dual percolations of electrical conductivity and electromagnetic interference shielding in progressively agglomerated CNT/polymer nanocomposites

2021 ◽  
pp. 108128652110214
Author(s):  
Xiaodong Xia ◽  
George J. Weng
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Percolation Threshold ◽  
Polymer Nanocomposites ◽  
Electromagnetic Interference ◽  
Effective Medium Theory ◽  
Scale Model ◽  
Shielding Effectiveness ◽  
Emi Shielding

Recent experiments have revealed two distinct percolation phenomena in carbon nanotube (CNT)/polymer nanocomposites: one is associated with the electrical conductivity and the other is with the electromagnetic interference (EMI) shielding. At present, however, no theories seem to exist that can simultaneously predict their percolation thresholds and the associated conductivity and EMI curves. In this work, we present an effective-medium theory with electrical and magnetic interface effects to calculate the overall conductivity of a generally agglomerated nanocomposite and invoke a solution to Maxwell’s equations to calculate the EMI shielding effectiveness. In this process, two complex quantities, the complex electrical conductivity and complex magnetic permeability, are adopted as the homogenization parameters, and a two-scale model with CNT-rich and CNT-poor regions is utilized to depict the progressive formation of CNT agglomeration. We demonstrated that there is indeed a clear existence of two separate percolative behaviors and showed that, consistent with the experimental data of poly-L-lactic acid (PLLA)/multi-walled carbon nanotube (MWCNT) nanocomposites, the electrical percolation threshold is lower than the EMI shielding percolation threshold. The predicted conductivity and EMI shielding curves are also in close agreement with experimental data. We further disclosed that the percolative behavior of EMI shielding in the overall CNT/polymer nanocomposite can be illustrated by the establishment of connective filler networks in the CNT-poor region. It is believed that the present research can provide directions for the design of CNT/polymer nanocomposites in the EMI shielding components.

scholarly journals Fatigue Behaviour of Unidirectional Single-Walled Carbon Nanotube Reinforced Epoxy Composite under Tensile Load

2003 ◽  
Vol 12 (1) ◽  
pp. 096369350301200 ◽  
Author(s):  
Y. Ren ◽  
F. Li ◽  
H. M. Cheng ◽  
K. Liao
Keyword(s):  
Carbon Nanotube ◽  
Tensile Load ◽  
Fatigue Behaviour ◽  
Epoxy Composites ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Matrix Cracks ◽  
The Matrix

Tension-tension fatigue behaviour of unidirectional, aligned single-walled carbon nanotube (SWNT) rope reinforced epoxy composites were studied. While the slope of the stress-life (S-N) curve of the SWNTs in SWNT/epoxy composites obtained is flat, similar to those of carbon fibre reinforced epoxy composites, the fatigue strength of the former is at least twice that of the latter. Morphology of the fatigue fracture surface of SWNT reinforced epoxy involves matrix plastic deformation and SWNT-bridged matrix cracks. Evidence of good adhesion between SWNTs and epoxy was seen, and pullout length of SWNTs from the matrix is about 30 μm. Results suggest that carbon nanotubes can be used for fatigue resistant, high fracture toughness composites.

Interface molecular engineering of single-walled carbon nanotube/epoxy composites

2012 ◽  
Vol 22 (5) ◽  
pp. 1928-1936 ◽  
Author(s):  
Yehai Yan ◽  
Jian Cui ◽  
Shuai Zhao ◽  
Jinfang Zhang ◽  
Jiwen Liu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Molecular Engineering ◽  
Epoxy Composites ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

scholarly journals Stretchable electromagnetic-interference shielding materials made of a long single-walled carbon-nanotube–elastomer composite

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10841-10847 ◽  
Author(s):  
Yuto Kato ◽  
Masahiro Horibe ◽  
Seisuke Ata ◽  
Takeo Yamada ◽  
Kenji Hata
Keyword(s):  
Carbon Nanotube ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Electromagnetic Interference Shielding ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

Flexible and stretchable electromagnetic-interference shielding sheets with high performance of shielding and stretchability are realized using long SWCNTs as fillers.

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