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

Cho, Dong Lyun (Faculty of Applied Chemical Engineering, Chonnam National University)
Kim, Hoon (Faculty of Applied Chemical Engineering, Chonnam National University)
Publication Information
Applied Chemistry for Engineering / v.16, no.3, 2005 , pp. 361-365 More about this Journal
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.
Keywords
cement reinforcing carbon fiber; plasma treatment; zeta potential; hydrophilicity; adhesion;
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