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http://dx.doi.org/10.7234/kscm.2009.22.5.008

Interfacial Properties of Gradient Specimen of CNT-Epoxy Nanocomposites using Micromechanical Technique and Wettability  

Wang, Zuo-Jia (경상대학교 나노.신소재공학부)
GnidaKouong, Joel (경상대학교 나노.신소재공학부)
Park, Joung-Man (경상대학교 나노.신소재공학부)
Lee, Woo-Il (서울대학교 기계.항공공학부)
Park, Jong-Gyu (국방과학연구소)
Publication Information
Composites Research / v.22, no.5, 2009 , pp. 8-14 More about this Journal
Abstract
Interfacial evaluation of glass fiber reinforced carbon nanotube (CNT)-epoxy nanocomposite was investigated by micromechanical technique in combination with wettability test. The contact resistance of the CNT-epoxy nanocomposite was measured using a gradient specimen, containing electrical contacts with gradually-increasing spacing. The contact resistance of CNT-epoxy nanocomposites was evaluated by using the two-point method rather than the four-point method. Due to the presence of hydrophobic domains on the heterogeneous surface, the static contact angle of CNT-epoxy nanocomposite was about $120^{\circ}$, which was rather lower than that for super-hydrophobicity. For surface treated-glass fibers, the tensile strength decreased dramatically, whereas the tensile modulus exhibited little change despite the presence of flaws on the etched fiber surface. The interfacial shear strength (IFSS) between the etched glass fiber and the CNT-epoxy nanocomposites increased due to the enhanced surface energy and roughness. As the thermodynamic work of adhesion, $W_a$ increased, both the mechanical IFSS and the apparent modulus increased, which indicated the consistency with each other.
Keywords
gradient nanocomposites; wettability; nondestructive evaluation; electro-micromechanical technique;
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Times Cited By KSCI : 2  (Citation Analysis)
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