다중벽 카본나노튜브가 보강된 고분자 나노복합체의 기계적, 열적, 전기적 특성

국정호; 허몽영; 양훈; 신동훈; 박대희; 나창운; Jeong Ho Kook; Mong-Young Huh; Hoon Yang; Dong-Hoon Shin; Dae-Hee Park; Changwoon Nah

Polymer(Korea), Vol.31, No.5, 422-427, September, 2007

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다중벽 카본나노튜브가 보강된 고분자 나노복합체의 기계적, 열적, 전기적 특성

Mechanical, Thermal and Electrical Properties of Polymer Nanocomposites Reinforced with Multiwalled Carbon Nanotubes

국정호, 허몽영, 양훈¹, 신동훈¹, 박대희¹, 나창운 ^†

전북대학교 고분자 BK-21 BIN 융합기술 연구팀
¹원광대학교 전자재료공학과

Jeong Ho Kook, Mong-Young Huh, Hoon Yang¹, Dong-Hoon Shin¹, Dae-Hee Park¹, and Changwoon Nah^†

BK-21 Polymer BIN Fusion Reserch Team, Chonbuk National University, 664-14, Duckjin-dong, Duckjin-gu, Jeonju 561-756, Korea
¹Department of Electronic Materials Engineering, Wonkwang University, 344-2, Sinyong-dong, Iksan 570-749, Korea

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초록

반도전층은 전력케이블의 도선과 고분자 절연층 사이에 위치하고 전기저항이 약 ∼102 Ωcm인 얇은 고분자층이다. 현재 일반적으로 사용되는 반도전층 소재는 카본블랙이 30 wt% 이상 보강된 고분자 복합체이다. 본 연구에서는 카본나노튜브(CNT)가 보강된 새로운 반도전층 재료를 제시하였다. 여러 가지 고분자 형태와 이중충전제 시스템을 적용하여 용액혼합 및 침전법으로 CNT가 보강된 고분자 나노복합체를 제조하였다. 기계적, 열적, 전기적 특성을 고분자 형태와 CNT와 카본블랙의 첨가비를 달리한 이중충전제 시스템의 함수로 조사하였다. 복합체의 전기 저항특성은 고분자 매트릭스의 결정화도와 밀접한 관련이 있었다. 즉, 결정화도가 감소함에 따라 일정한 수준의 결정화도까지 전기저항이 선형적으로 감소하였고, 그 이하에서는 일정한 값을 나타내었다. 이중충전제 시스템 역시 전기적 저항에 영향을 미쳤다. CNT만으로 보강된 나노복합체가 가장 낮은 전기적 저항특성을 보였다. 소량의 카본블랙이 첨가되면 결정화도가 급격히 증가하고 결국 전기저항의 증가를 초래하였다.

Semiconducting layers are thin rubber film between electrical cable wire and insulating polymer layers having a volume resistivity of ∼102 Ωcm. Commercial semiconducting layers are composed of polymer composites reinforced with more than 30 wt% of carbon blacks. A new semiconducting material was suggested in this study based on the carbon nanotube(CNT)-reinforced polymer nanocomposites. CNT-reinforced polymer nanocomposites were prepared by solution mixing and precipitation with various polymer type and dual filler system. The mechanical, thermal and electrical properties were investigated as a function of polymer type and dual filler system based on CNT and carbon black. The volume resistivity of composites was strongly related with the crystallinity of polymer matrix. With the decreased crystallinity, the volume resistivity decreased linearly until a critical point, and it remained constant with further decreasing the crystallinity. Dual filler system also affected the volume resistivity. The CNT-reinforced nanocomposite showed the lowest volume resistivity. When a small amount of carbon black(CB) was replaced the CNT, the crystallinity increased considerably leading to a higher volume resistivity.

Keywords:carbon nanotubes;nanocomposites;solution mixing;crystallinity;dual filler system

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[Referenced By]

[Related Articles]

[1] Ijima S, Nature, 354, 56 (1991)

[2] Tans SJ, Devoret MH, Dai HJ, Thess A, Smalley RE, Geerligs LJ, Dekker C, Nature, 386(6624), 474 (1997)

[3] Che GL, Lakshmi BB, Fisher ER, Martin CR, Nature, 393(6683), 346 (1998)

[4] Lee YH, KIEEME, 13, 1 (2000)

[5] Delaney P, Choi HJ, Ihm J, Louie SG, Cohen ML, Nature, 391(6666), 466 (1998)

[6] Ihm JS, Fiber Technol. Ind., 2, 326 (1998)

[7] Tans SJ, Verschueren ARM, Dekker C, Nature, 393(6680), 49 (1998)

[8] Liu C, Fan YY, Liu M, Cong HT, Cheng HM, Dresselhaus MS, Science, 286, 1127 (1999)

[9] Kong J, Franklin NR, Zhou C, Chapline MG, Peng S, Cho K, Dai H, Science, 287, 622 (2000)

[10] Baughman RH, Zakhidov AA, de Heer WA, Science, 297, 787 (2002)

[11] Min BG, Polym. Sci. Technol., 16, 176 (2005)

[12] Han JH, Kim SJ, Kwon OH, Kang HT, Seo KS, J. KIEEME, 46, 19 (1997)

[13] Feller JF, Grohens Y, Sens. Actuators B-Chem., 97, 231 (2004)

[14] Yoo TJ, Polym. Sci. Technol., 9, 381 (1998)

[15] Kim YA, Hayashi T, Endo M, Gotoh Y, Wada N, Seiyama J, Scrip. Mater., 54, 31 (2006)

[16] Li SN, Li B, Li ZM, Fu Q, Shen KZ, Polymer, 47(13), 4497 (2006)

[17] Ferrara M, Neitzert HC, Sarno M, Gorrasi G, Sannino D, Vittoria V, Ciambelli P, Physica E, 37, 66 (2007)

[18] Tang H, Chen X, Luo Y, Eur. Polym. J., 32, 963 (1996)

[19] Yang S, Tijerina JT, Diaz VS, Hernandez K, Lozano K, Compos. Part B-Eng., 38, 228 (2007)

[20] Moon SC, Jung HS, Lee JC, Hong JW, Choi JK, Jo BW, J. Korean Ind. Eng. Chem., 16(1), 52 (2005)

[21] Dondero WE, Gorga RE, J. Polym. Sci. B: Polym. Phys., 44(5), 864 (2006)

[22] Park HS, Kim JY, Kim SH, Tex. Sci. Eng., 44, 28 (2007)

[23] Nobile MR, Simon GP, Valentino O, Macromol M, Macromol. Symp., 247, 78 (2007)

[24] Yakobson BI, Campbell MP, Brabec CJ, Bernholc J, Comput. Mater. Sci., 8, 341 (1997)