scholarly journals Thermal Conductivity of Carbon Nanoreinforced Epoxy Composites

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
C. Kostagiannakopoulou ◽  
E. Fiamegkou ◽  
G. Sotiriadis ◽  
V. Kostopoulos
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Multiwalled Carbon Nanotubes ◽  
Epoxy Matrix ◽  
Epoxy Composites ◽  
Graphite Nanoplatelets ◽  
Multiwalled Carbon ◽  
Micromechanical Models ◽  
Carbon Fiber Epoxy

The present study attempts to investigate the influence of multiwalled carbon nanotubes (MWCNTs) and graphite nanoplatelets (GNPs) on thermal conductivity (TC) of nanoreinforced polymers and nanomodified carbon fiber epoxy composites (CFRPs). Loading levels from 1 to 3% wt. of MWCNTs and from 1 to 15% wt. of GNPs were used. The results indicate that TC of nanofilled epoxy composites increased with the increase of GNP content. Quantitatively, 176% and 48% increase of TC were achieved in nanoreinforced polymers and nanomodified CFRPs, respectively, with the addition of 15% wt. GNPs into the epoxy matrix. Finally, micromechanical models were applied in order to predict analytically the TC of polymers and CFRPs. Lewis-Nielsen model with optimized parameters provides results very close to the experimental ones in the case of polymers. As far as the composites are concerned, the Hashin and Clayton models proved to be sufficiently accurate for the prediction at lower filler contents.

COMBINED TEMPERATURE AND MOISTURE EFFECT ON THE STRENGTH OF CARBON NANOTUBE REINFORCED EPOXY MATERIALS

2013 ◽  
Vol 37 (3) ◽  
pp. 755-763 ◽  
Author(s):  
Yi-Ming Jen ◽  
Chien-Yang Huang
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Epoxy Matrix ◽  
Interfacial Adhesion ◽  
Epoxy Composites ◽  
Multiwalled Carbon ◽  
Moisture Effect ◽  
Hygrothermal Effect ◽  
Temperature And Humidity

This study experimentally analyzed the hygrothermal effect on the static and fatigue strengths of multiwalled carbon nanotubes (CNTs)/epoxy composites. The results show that the static and fatigue strengths decreased slightly at 25°C/85% RH environments compared with those tested under the 25°C/60% RH condition. However, the strengths decreased substantially under the 40°C/85% RH condition, indicating that the combined temperature and humidity environments weaken the interfacial adhesion between the CNT surfaces and the epoxy matrix.

scholarly journals Thermal Conductivity of Epoxy Resin Reinforced with Magnesium Oxide Coated Multiwalled Carbon Nanotubes

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Fei-Peng Du ◽  
Hao Tang ◽  
De-Yong Huang
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Magnesium Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Epoxy Matrix ◽  
Content Increase ◽  
Epoxy Nanocomposites ◽  
Multiwalled Carbon ◽  
Mwnt Content ◽  
Filler Content Increase

Magnesium oxide coated multiwalled carbon nanotubes (MgO@MWNT) were fabricated and dispersed into epoxy matrix. The microstructures of MgO@MWNT and epoxy/MgO@MWNT nanocomposites were characterized by TEM and SEM. Electrical resistivity and thermal conductivity of epoxy nanocomposites were investigated with high resistance meter and thermal conductivity meter, respectively. MgO@MWNT has core-shell structure with MgO as shell and nanotube as core, and the thickness of MgO shell is ca. 15 nm. MgO@MWNT has been dispersed well in the epoxy matrix. MgO@MWNT loaded epoxy nanocomposites still retain electrical insulation inspite of the filler content increase. However, thermal conductivity of epoxy was increased with the MgO@MWNT content increasing. When MgO@MWNT content reached 2.0 wt.%, thermal conductivity was increased by 89% compared to neat epoxy, higher than that of unmodified MWNT nanocomposites with the same loading content.

Mixed-mode I/II interlaminar fracture toughness of carbon fiber/epoxy composites with the addition of multiwalled carbon nanotubes by spraying technique

2018 ◽  
Vol 52 (22) ◽  
pp. 3045-3052 ◽  
Author(s):  
JA Rodríguez-González ◽  
C Rubio-González
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Carbon Fiber ◽  
Multiwalled Carbon Nanotubes ◽  
Mixed Mode ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Multiwalled Carbon ◽  
Bending Tests ◽  
Carbon Fiber Epoxy

This work reports the effect of multiwalled carbon nanotubes on mixed-mode I/II interlaminar fracture toughness ([Formula: see text]) of unidirectional carbon fiber/epoxy composite laminates made by prepregs. The carbon fiber/epoxy laminates were fabricated in an autoclave with a previous deposition of different multiwalled carbon nanotube contents at their middle plane interface by spraying technique. Mixed-mode bending tests were conducted on carbon fiber/epoxy laminate specimens under different mixed-mode ratios. The results of mixed-mode bending tests showed that the addition of multiwalled carbon nanotubes can effectively improve the [Formula: see text] of carbon fiber/epoxy laminates. With a 0.2 wt.% multiwalled carbon nanotubes content in carbon fiber/epoxy laminates, the [Formula: see text] under mixed-mode ratios of 0.2, 0.5 and 0.8 increased by 25%, 12% and 19%, respectively. These results were explained in terms of the damage mechanisms observed at the fracture surfaces of tested specimens by scanning electron microscopy.

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