The effect of CNT diameters on properties of CNT-polyamide composites was investigated such as electrical conductivity, tensile strength and thermal conductivity. To get different diameter distributions of CNTs, several portions of Mo and Fe in Mo-Fe/MgO catalysts were synthesized by a combustion method at 600℃. And all CNTs growed at 900℃ with 3 SLM methane and 1 SLM hydrogen for 40min. Four kinds of CNTs with different diameter distributions, such as 1~3nm, 3~7nm, 7~13nm, and 10~30nm, were selected to make CNT-polyamide composites. Each composite was manufactured by a solution mixing using bar-type ultra-sonicator in the CNT portions from 1phr to 50phr. And electrical conductivity, tensile strength, and thermal conductivity were measured. Three properties of CNT-polyamide composite, manufactured with 10nm diameter, were more excellent compared to other composites, with electrical conductivity  Ω at 7phr, thermal conductivity 2.4.W/mK at 40phr, tensile strength 60MPa at 30phr. CNTs with a diameter of 10nm were superior to other diameters for the multi-functional composite such as CNT-polyamide composites.

• 김경재(Korea Institute of Carbon Convergence Technology) | Kyoung-Jae Kim
• 박영수(Korea Institute of Carbon Convergence Technology) | Young-Soo Park
• 송준혁(Korea Institute of Carbon Convergence Technology) | Joon-Hyuk Song
• 강신재(Mechanical Design Engineering, Chonbuk National University) | Shin-Jae. Kang
• 양성모(Mechanical Systems Engineering, Chonbuk National University) | Sung-Mo Yang Corresponding Author