고분자 복합재의 물리화학적 및 전자파차폐 특성에 미치는 탄소나노튜브의 불소화 영향

이시은; 김도영; 이만영; 이민경; 정의경; 이영석; Si-Eun Lee; Doyoung Kim; Man Young Lee; Min-Kyung Lee; Euigyung Jeong; Young-Seak Lee

Polymer(Korea), Vol.39, No.1, 114-121, January, 2015

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고분자 복합재의 물리화학적 및 전자파차폐 특성에 미치는 탄소나노튜브의 불소화 영향

Effect of Fluorination of Carbon Nanotubes on Physico-chemical and EMI Shielding Properties of Polymer Composites

이시은, 김도영, 이만영¹, 이민경¹, 정의경¹, 이영석 ^†

충남대학교 정밀응용화학과
¹국방과학연구소

Si-Eun Lee, Doyoung Kim, Man Young Lee¹, Min-Kyung Lee¹, Euigyung Jeong¹, and Young-Seak Lee^†

Department of Applied Chemistry and Biological Engineering, Chungnam National University, Daejeon 305-764, Korea
¹The 4th R&D Institute-4, Agency for Defense Development, Daejeon 305-600, Korea

E-mail:

초록

탄소나노튜브의 불순물을 제거하고 에폭시 수지와의 계면접착력 향상과 에폭시 내 탄소나노튜브의 분산성 증가를 위하여 불산(hydrofluoric acid)으로 그 표면을 개질하였다. 표면 처리된 탄소나노튜브의 결정성은 광전자 분광기(X-ray photoelectron spectroscopy)와 라만 분광기(Raman spectroscopy)를 통해 분석하였고, 인장시험으로 기계적 강도 분석을 실시하였다. 표면 처리된 탄소나노튜브/에폭시 복합재의 인장강도는 미처리 탄소나노튜브/에폭시 복합재와 비교하여 최대 약 33% 향상됨을 확인할 수 있었고, 탄소나노튜브/에폭시 복합재의 전자파차폐 특성은 탄소나노튜브의 불산처리 농도에 따라 증가하는 경향을 보였고 25%의 농도로 처리되었을 때, 최대 전자파차폐 특성을 보였다. 그러나 기계적 특성 및 전자파차폐 특성은 50% 이상의 불산 농도로 처리된 탄소나노튜브/에폭시 복합재에서 오히려 감소하였으며 이는 높은 농도의 불산으로 인하여 탄소나노튜브의 표면 결정성 감소 및 고유 특성에 영향을 미친 것으로 파악된다. 고분자 복합재의 기계적, 전기적 특성 향상은 불산 처리로 인한 탄소나노튜브의 결정성 향상과 에폭시 수지 내에 분산성의 증가에 기인하였다.

Mutli-walled carbon nanotubes (MWCNTs) were surface-modified by a hydrofluoric acid solution to remove impurities and improve interfacial bonding and dispersion of nanotubes in an epoxy matrix. The crystallinity on the surface of treated MWCNTs was investigated by X-ray photoelectron spectroscopy and Raman spectroscopy. The mechanical properties were characterized by tensile test, and the enhancement of mechanical properties of the modified MWCNTs/epoxy composites was indicated by a 33% increase in tensile strength. The electromagnetic interference shielding effectiveness (EMI-SE) of modified MWCNTs/epoxy composites was improved with an increase in concentration of hydrofluoric solution, and EMI-SE showed the maximum increase with 25% HF. However, mechanical and EMI-SE properties didn’t show further increase with over 50% HF concentration because the properties of MWCNTs were influenced by degradation of crystallinity and intrinsic properties of MWCNTs. The mechanical and electrical property enhancements of the polymer composites are attributed to the modification of MWCNTs which improve crystallinity of MWCNTs and dispersion in the epoxy resin.

Keywords:mutli-walled carbon nanotubes (MWCNTs);epoxy;surface treatment;mechanical properties;electromagnetic interference shielding effectiveness.

[References]

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Hu Q, Kim MS, Carbon Lett., 9, 298 (2008)
Martzui L, Vovchenko L, Prylutskyy Y, Korotash I, Marzui V, Eklund P, Ritter U, Scharff P, Mater. Sci. Eng. C, 27, 1007 (2007)
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Huang CY, Chiou TW, Eur. Polym. J., 34, 37 (1998)
Huang CY, Pai JF, J. Appl. Polym. Sci., 63(1), 115 (1997)
Huang CY, Mo WW, Surf. Coat. Technol., 154, 55 (2002)
Huang CY, Mo WW, J. Appl. Polym. Sci., 85(8), 1661 (2002)
Park KY, Lee SE, Kim CG, Han JH, Compos. Struct., 81, 401 (2007)
Im JS, Kim JG, Lee YS, Carbon, 47, 2640 (2009)
Huang Y, Li N, Ma Y, Du F, Li F, He X, Lin X, Gao H, Chen Y, Carbon, 45, 1614 (2007)
Xie X, Mai, Zhou X, Mater. Sci. Eng. R. Rep., 49, 89 (2005)
Zhu J, Kim J, Peng H, Margrave JL, Khabashesku VN, Barrera EV, Nano Lett., 3, 1107 (2003)
Abdalla M, Dean D, Adibempe D, Nyairo E, Robinson P, Thompson G, Polymer, 48(19), 5662 (2007)
Sun YP, Fu K, Lin Y, Huang W, Acc. Chem. Res., 35, 1096 (2002)
Dyke CA, Tour JM, Chem. Eur. J., 10, 812 (2004)
Jeong E, Jung MJ, Cho SH, Lee SI, Lee YS, Colloid Surf. A, 377, 243 (2011)
Ma PC, Kim JK, Tang BZ, Compos. Sci. Technol., 67, 2965 (2007)
Lanticse LJ, Tanabe Y, Matsui K, Kaburagi Y, Suda K, Hoteida M, Endo M, Yasuda E, Carbon, 44, 3078 (2006)
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Kim JA, Seong DG, Kang TJ, Youn JR, Carbon, 44, 1898 (2006)
Choi YK, Sugimoto K, Song SM, Gotoh Y, Ohkoshi Y, Endo M, Carbon, 43, 2199 (2005)
Thostenson ET, Li C, Chou TW, Compos. Sci. Technol., 65, 491 (2005)
Thostenson ET, Chou TW, J. Phys. D. Appl. Phys., 35, 77 (2002)
Rosca ID, Watan F, Uo M, Akasaka T, Carbon, 43, 3124 (2005)
Kuan HC, Ma CCM, Chang WP, Yuen SM, Wu HH, Lee TM, Compos. Sci. Technol., 65, 1703 (2005)
Al-Saleh MH, Sundararaj U, Carbon, 47, 1738 (2009)
Bhadra S, Singha NK, Khstair D, Curr. Appl. Phys., 9, 139 (2009)

[Referenced By]

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[1] Jou WS, Cheng HZ, Hsu CF, J. Alloys Compd., 434, 641 (2007)

[2] Hu Q, Kim MS, Carbon Lett., 9, 298 (2008)

[3] Martzui L, Vovchenko L, Prylutskyy Y, Korotash I, Marzui V, Eklund P, Ritter U, Scharff P, Mater. Sci. Eng. C, 27, 1007 (2007)

[4] Chung DDL, Carbon, 39, 279 (2001)

[5] Huang CY, Wu CC, Eur. Polym. J., 36, 2729 (2000)

[6] Huang CY, Pai JF, Eur. Polym. J., 34, 261 (1998)

[7] Huang CY, Chiou TW, Eur. Polym. J., 34, 37 (1998)

[8] Huang CY, Pai JF, J. Appl. Polym. Sci., 63(1), 115 (1997)

[9] Huang CY, Mo WW, Surf. Coat. Technol., 154, 55 (2002)

[10] Huang CY, Mo WW, J. Appl. Polym. Sci., 85(8), 1661 (2002)

[11] Park KY, Lee SE, Kim CG, Han JH, Compos. Struct., 81, 401 (2007)

[12] Im JS, Kim JG, Lee YS, Carbon, 47, 2640 (2009)

[13] Huang Y, Li N, Ma Y, Du F, Li F, He X, Lin X, Gao H, Chen Y, Carbon, 45, 1614 (2007)

[14] Xie X, Mai, Zhou X, Mater. Sci. Eng. R. Rep., 49, 89 (2005)

[15] Zhu J, Kim J, Peng H, Margrave JL, Khabashesku VN, Barrera EV, Nano Lett., 3, 1107 (2003)

[16] Abdalla M, Dean D, Adibempe D, Nyairo E, Robinson P, Thompson G, Polymer, 48(19), 5662 (2007)

[17] Sun YP, Fu K, Lin Y, Huang W, Acc. Chem. Res., 35, 1096 (2002)

[18] Dyke CA, Tour JM, Chem. Eur. J., 10, 812 (2004)

[19] Jeong E, Jung MJ, Cho SH, Lee SI, Lee YS, Colloid Surf. A, 377, 243 (2011)

[20] Ma PC, Kim JK, Tang BZ, Compos. Sci. Technol., 67, 2965 (2007)

[21] Lanticse LJ, Tanabe Y, Matsui K, Kaburagi Y, Suda K, Hoteida M, Endo M, Yasuda E, Carbon, 44, 3078 (2006)

[22] Chen QD, Dai LM, Gao M, Huang SM, Mau A, J. Phys. Chem. B, 105(3), 618 (2001)

[23] Sun YP, Fu K, Lin Y, Huqng W, Acc. Chem. Res., 35, 1096 (2002)

[24] Kim JA, Seong DG, Kang TJ, Youn JR, Carbon, 44, 1898 (2006)

[25] Choi YK, Sugimoto K, Song SM, Gotoh Y, Ohkoshi Y, Endo M, Carbon, 43, 2199 (2005)

[26] Thostenson ET, Li C, Chou TW, Compos. Sci. Technol., 65, 491 (2005)

[27] Thostenson ET, Chou TW, J. Phys. D. Appl. Phys., 35, 77 (2002)

[28] Rosca ID, Watan F, Uo M, Akasaka T, Carbon, 43, 3124 (2005)

[29] Kuan HC, Ma CCM, Chang WP, Yuen SM, Wu HH, Lee TM, Compos. Sci. Technol., 65, 1703 (2005)

[30] Al-Saleh MH, Sundararaj U, Carbon, 47, 1738 (2009)

[31] Bhadra S, Singha NK, Khstair D, Curr. Appl. Phys., 9, 139 (2009)