저온 플라즈마 공정을 이용한 시멘트 보강용 탄소 섬유의 표면개질

조동련; 김훈; Dong Lyun Cho; Hoon Kim

Journal of the Korean Industrial and Engineering Chemistry, Vol.16, No.3, 361-365, June, 2005

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저온 플라즈마 공정을 이용한 시멘트 보강용 탄소 섬유의 표면개질

Surface Modification of Cement-Reinforcing Carbon Fibers by Low Temperature Plasma Process

조동련 ^†, 김훈

전남대학교 응용화학공학부

Dong Lyun Cho^†, and Hoon Kim

Faculty of Applied Chemical Engineering, Chonnam National University, Kwangju 500-757, Korea

E-mail:

초록

O2, H2O, acrylic acid, diaminocyclohexane 등의 저온 플라즈마를 이용하여 시멘트 보강용 탄소 섬유 표면을 친수성으로 개질한 다음, 이에 대한 효과를 살펴보았다. 물과의 접촉각이 75~80° 정도로 소수성이던 표면이 친수성으로 변하여 접촉각이 10° 이하로까지 낮아졌으며, 이에 따라 흡습성 및 수용액에서 분산성이 크게 향상되었다. 또한, 섬유표면의 제타 포텐셜이 변하여 시멘트와 정전기적 인력이 향상됨으로써 시멘트의 결착도 향상과 함께 시멘트와의 결합이 57~124%까지 향상되었다.

Cement-reinforcing carbon fibers were surface-modified with O2, H2O, acrylic acid, diaminocyclohexane plasmas and their effects were investigated. Hydrophobic surfaces with water contact angles of 75~80° were changed to hydrophilic surfaces. The water contact angles were reduced down to lower than 10°. As a result, the fiber's hygroscopic property and dispersion in water were improved. Also, Zeta potential of the fiber in water was changed from a negative value to positive values. As a result, adhesion with cement that had a negative Zeta potential was improved up to 57~124% through increased electrostatic interaction.

Keywords:cement reinforcing carbno fiber;plasma treatment;zeta potential;hydrophilicity;adhesion

[References]

Schwartz M, Composite Materials Handbook, McGraw-Hill, New York (1992)
Bentur A, Mindess S, Fibre Reinforced Cementitious Composites, Elsevier, London (1990)
Park SB, Lee BJ, Lim YS, Cem. Concr. Res., 21, 589 (1991)
Grzybowski M, Shah SP, ACI Mater. J., 87, 138 (1990)
Fu X, Lu W, Chung DDL, Carbon, 36, 1337 (1998)
Fu X, Lu W, Chung DDL, Cem. Concr. Res., 35, 1485 (1996)
Xu Y, Chung DDL, Cem. Concr. Res., 29, 451 (1999)
Wu HC, Li VC, Cem. Concr. Compos., 21, 205 (1999)
Yuan LY, Shyu SS, Lai JY, J. Appl. Polym. Sci., 42, 2525 (1991)
SHEU GS, SHYU SS, J. Adhes. Sci. Technol., 8(5), 531 (1994)
Pouchert CJ, The Aldrich Library of FT-IR Spectra, Edition 1, Aldrich Chemical Company, Milwaukee, WI (1985)
Cho DL, Claesson PM, Golander CG, Johansson K, J. Appl. Polym. Sci., 41, 1373 (1993)
Golander CG, Rutland MW, Cho DL, Johansson A, Ringblom H, Jonsson S, Yasuda HK, J. Appl. Polym. Sci., 49, 39 (1993)

[Related Articles]

[1] Schwartz M, Composite Materials Handbook, McGraw-Hill, New York (1992)

[2] Bentur A, Mindess S, Fibre Reinforced Cementitious Composites, Elsevier, London (1990)

[3] Park SB, Lee BJ, Lim YS, Cem. Concr. Res., 21, 589 (1991)

[4] Grzybowski M, Shah SP, ACI Mater. J., 87, 138 (1990)

[5] Fu X, Lu W, Chung DDL, Carbon, 36, 1337 (1998)

[6] Fu X, Lu W, Chung DDL, Cem. Concr. Res., 35, 1485 (1996)

[7] Xu Y, Chung DDL, Cem. Concr. Res., 29, 451 (1999)

[8] Wu HC, Li VC, Cem. Concr. Compos., 21, 205 (1999)

[9] Yuan LY, Shyu SS, Lai JY, J. Appl. Polym. Sci., 42, 2525 (1991)

[10] SHEU GS, SHYU SS, J. Adhes. Sci. Technol., 8(5), 531 (1994)

[11] Pouchert CJ, The Aldrich Library of FT-IR Spectra, Edition 1, Aldrich Chemical Company, Milwaukee, WI (1985)

[12] Cho DL, Claesson PM, Golander CG, Johansson K, J. Appl. Polym. Sci., 41, 1373 (1993)

[13] Golander CG, Rutland MW, Cho DL, Johansson A, Ringblom H, Jonsson S, Yasuda HK, J. Appl. Polym. Sci., 49, 39 (1993)