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Korean Chemical Engineering Research,
Vol.54, No.3, 410-418, 2016
Vol.54, No.3, 410-418, 2016
다중벽 탄소나노튜브와 니켈 분말을 포함하는 전도성 복합체 제조
Preparation of Electrically Conductive Composites Filled with Nickel Powder and MWCNT Fillers
본 연구에서는 Multi-Walled Carbon Nanotube (MWCNT)와 니켈 분말을 포함하는 전기 전도성 복합체를 제조하여 물성을 비교하였다. 복합체 제조에 앞서, MWCNT 표면을 개질하여 카르복실기(-COOH)와 아미노기(-NH2)를 도입하였으며, 표면 개질 혹은 개질되지 않은 MWCNT와 니켈 분말을 diglycidyl ether of bisphenol A (DGEBA)에 분산하여 전기 전도성 복합체를 제조하였다. 그리고 triethylenetetramine (TETA)를 경화제로 사용하여 전도성 복합체와 혼합한 후, doctor blade법으로 코팅하여 전기전도성 변화를 측정하였다. MWCNT의 표면 개질 여부와 에폭시 수지와의 반응여부는 fourier transform infrared (FTIR) spectrometer, thermogravimetric analyzer (TGA) 및 elemental analyzer (EA) 로 확인하였으며, 복합체의 표면 형상은 scanning electron microscope (SEM), 복합체의 면 저항 값은 4-point probe로 측정하였다. 그 결과 아미노기로 표면 개질한 MWCNT 0.5 wt%와 40%의 니켈 분말을 사용하여 제조한 복합체의 면저항 값은 (9.87 ± 1.09)×104 Ω/sq로 니켈 분말만 53.3% 사용하여 제조한 복합체의 면 저항 값과 유사한 값을 나타내었다. 따라서, 0.5%의 아미노기로 개질된 MWCNT를 포함하는 전도성 복합체는 순수 니켈 분말만 사용하는 복합체보다 13.3%의 니켈 분말 함량을 감소할 수 있음을 알았다.
In this study, we prepared electrically conducting composites using epoxy resin of diglycidyl ether of bisphenol A (DGEBA) as a matrix, triethylenetetramine (TETA) as a hardener and nickel powder or multi-walled carbon nanotubes (MWCNTs) grafted with -NH2 groups (MWCNT-NH2) as electrically conducting fillers. Electrical conductivity of composite films were measured by coating on the slide glass with a doctor blade. We measured modification reactions of MWCNT and reaction of MWCNT-NH2 with DGEBA epoxy resin by fourier transform infrared spectrometer (FTIR), thermogravimetric analyzer (TGA) and elemental analyzer (EA). Morphology of composites was investigated by scanning electron microscope (SEM) and sheet resistances of composites were measured by 4-point probe. We found (9.87 ± 1.09) × 104 Ω/sq of sheet resistance for epoxy composite containing both 40 wt% nickel powder and 0.5 wt% of MWCNT-NH2 as fillers, equivalent to epoxy composite containing 53.3 wt% nickel powder only as a filler.
Keywords:
Diglycidyl ether of bisphenol A (DGEBA); Surface modification; MWCNT; Nanocomposite; Sheet resistance
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