Dispersive Evaluation and Self-Sensing of Single Carbon Fiber/CNT-Epoxy Composites using Electro-Micromechanical Techniques

ABSTRACTSelf-sensing and interfacial evaluation were investigated with different dispersion solvents for single carbon fiber/carbon nanotube (CNT)-epoxy composites by electro-micromechanical technique and acoustic emission (AE) under loading/subsequent unloading. Optimized dispersion procedure was set up to obtain improved mechanical and electrical properties. Apparent modulus and electrical contact resistivity for CNT-epoxy composites were correlated with different dispersion solvents for CNT. CNT-epoxy composites using good dispersion solvent showed higher apparent modulus because of better stress transferring effect due to relatively uniform dispersion of CNT in epoxy and enhanced interfacial adhesion between CNT and epoxy matrix. However, good solvent showed high apparent modulus but low thermodynamic work of adhesion, Wa for single carbon microfiber/CNT-epoxy composite. It is because hydrophobic high advanced contact angle was shown in good solvent, which can not be compatible with carbon microfiber well. Damage sensing was also detected simultaneously by AE combined with electrical resistance measurement. Electrical resistivity increased stepwise with progressing fiber fracture due to the maintaining numerous electrical contact by CNT.

Download Full-text

Factorial design approach to assess the effect of fiber–matrix adhesion on the IFSS and work of adhesion of carbon fiber/polysulfone-modified epoxy composites

Carbon letters ◽

10.1007/s42823-019-00039-7 ◽

2019 ◽

Vol 29 (4) ◽

pp. 345-358 ◽

Cited By ~ 2

Author(s):

Javier I. Cauich-Cupul ◽

Pedro J. Herrera-Franco ◽

Edgar García-Hernández ◽

Veronica Moreno-Chulim ◽

Alex Valadez-González

Keyword(s):

Carbon Fiber ◽

Factorial Design ◽

Design Approach ◽

Epoxy Composites ◽

Work Of Adhesion ◽

Matrix Adhesion ◽

Fiber Matrix ◽

Modified Epoxy

Download Full-text

Nondestructive Damage Sensitivity and Reinforcing Effect of Functionalized Carbon Nanotube and Nanofiber/Epoxy Composites Using Electro-Micromechanical Techniques

MRS Proceedings ◽

10.1557/proc-851-nn2.5 ◽

2004 ◽

Vol 851 ◽

Author(s):

Joung-Man Park ◽

Jin-Kyu Jung ◽

Sung-Ju Kim ◽

Dae-Sik Kim ◽

Jae-Rock Lee ◽

...

Keyword(s):

Carbon Nanotube ◽

Electrical Properties ◽

Load Transfer ◽

Epoxy Composites ◽

Fiber Damage ◽

Damage Sensing ◽

Apparent Modulus ◽

Mechanical And Electrical Properties ◽

Dispersion Degree ◽

Treated Carbon

ABSTRACTNondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electro-micromechanical technique. Carbon black (CB) was used only for the comparison. Electro-micromechanical techniques were applied to obtain the fiber damage and stress transferring effect of carbon nanocomposites with their contents. Thermal treatment and temperature affected on apparent modulus and electrical properties on nanocomposites due to enhanced inherent properties of each CNMs. Coefficient of variation (COV) of volumetric electrical resistance can be used to obtain the dispersion degree indirectly for various CNMs. Dispersion and surface modification are very important parameters to obtain improved mechanical and electrical properties of CNMs for multifunctional applications. Further optimized functionalization and dispersion conditions will be investigated for the following work continuously.

Download Full-text