IMPROVED ELECTRICAL CONDUCTIVITY OF CARBON NANOTUBE MAT COMPOSITE PREPARED BY IN-SITU POLYMERIZATION

Title
IMPROVED ELECTRICAL CONDUCTIVITY OF CARBON NANOTUBE MAT COMPOSITE PREPARED BY IN-SITU POLYMERIZATION
Authors
노예지김성륜
Keywords
복합재료; 탄소나노튜브 매트; 저점도 열가소성 수지; 열압착; 기계적 특성; 열전도도; 전기전도도; CNT mat; CBT; Electrical conductivity
Issue Date
2013-08
Publisher
THE 19TH INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS
Abstract
The electrical conductivity measured using the fourprobe method depends largely on the resistance and thickness of the sample; therefore, the electrical properties of the CNT mat composites are summarized in Table 1 in terms of resistance, thickness and conductivity. The electrical conductivity was enhanced by increasing the compression pressure and a relatively large improvement was observed in the CNT mat composites prepared under low compression pressures. Table 1 provides confirmation that the large improvement was due to the considerable reduction in resistance of the CNT mat composites prepared under compression pressures of 0.5, 9 and 18 MPa. A relatively small improvement was observed for the CNT mat composites prepared under high compression pressures due to the reduction in thickness of the CNT mat composites prepared under compression pressures of 18, 27 and 36 MPa. A large difference was noted in the electrical conductivities of the CNT mat composites prepared under 36 MPa at 250 ℃ for 2 min and under 36 MPa at 190 ℃ for 40 min. The electrical conductivity of the quenched composites prepared under 36 MPa at 250 ℃ for 2 min was much higher than that of the composites cooled by air convection. A CBT oligomer resin was polymerized at a temperature above 160 ℃ and was converted into pCBT. Because the conversion rate from CBT to pCBT can significantly affect the properties of a composite, one must measure the conversion rate from CBT to pCBT with respect to the processing temperature. The conversion rate could not be evaluated using differential scanning calorimetry because the polymerization of the oligomer resin was an entropically driven non-exothermic reaction. Hence, the conversion rate was determined via GPC, a method used to measure the molecular weight of organic materials. The evaluated temperature range was limited between 160 to 250 ℃ because polymerization did not occur at temperatures bel
URI
http://pubs.kist.re.kr/handle/201004/45226
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KIST Publication > Conference Paper
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