Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Surface Modification of Cement-Reinforcing Carbon Fibers by Low Temperature Plasma Process

저온 플라즈마 공정을 이용한 시멘트 보강용 탄소 섬유의 표면개질

  • Cho, Dong Lyun (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Kim, Hoon (Faculty of Applied Chemical Engineering, Chonnam National University)
  • 조동련 (전남대학교 응용화학공학부) ;
  • 김훈 (전남대학교 응용화학공학부)
  • Received : 2004.11.22
  • Accepted : 2005.03.31
  • Published : 2005.06.10
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Abstract

Cement-reinforcing carbon fibers were surface-modified with $O_2$, $H_2O$, acrylic acid, diaminocyclohexane plasmas and their effects were investigated. Hydrophobic surfaces with water contact angles of $75{\sim}80^{\circ}$ were changed to hydrophilic surfaces. The water contact angles were reduced down to lower than $10^{\circ}$. 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.

$O_2$, $H_2O$, acrylic acid, diaminocyclohexane 등의 저온 플라즈마를 이용하여 시멘트 보강용 탄소 섬유 표면을 친수성으로 개질한 다음, 이에 대한 효과를 살펴보았다. 물과의 접촉각이 $75{\sim}80^{\circ}$ 정도로 소수성이던 표면이 친수성으로 변하여 접촉각이 $10^{\circ}$ 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.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단

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