Santos, Alberto Lima
Botelho, Edson Cocchieri
Kostov, Konstantin G.
Nascente, Pedro A. P.
da Silva, Leide Lili G.
Total Authors: 5
 Sao Paulo State Univ UNESP, Dept Mat & Technol, BR-12516410 Sao Paulo - Brazil
 Sao Paulo State Univ UNESP, Dept Chem & Phys, BR-12516410 Sao Paulo - Brazil
 Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
 Technol Fac Pindamonhangaba FATEC, BR-12455010 Sao Paulo - Brazil
Total Affiliations: 4
IEEE TRANSACTIONS ON PLASMA SCIENCE;
Web of Science Citations:
Plasma processing of carbon fibers (CFs) is aimed to provide better contact and adhesion between individual plies without decrease in the CF mechanical resistance. This paper deals with surface modification of CFs by an atmospheric pressure dielectric barrier discharge (DBD) for enhancing the adhesion between the CF and the polymeric matrix. The scanning electron microscopy of the treated samples revealed many small particles distributed over entire surface of the fiber. These particles are product of the fiber surface etching during the DBD treatment that removes the epoxy layer covering as-received samples. The alteration of the CF surface morphology was also confirmed by the Atomic force microscopy (AFM), which indicated that the CF roughness increased as a result of the plasma treatment. The analysis of the surface chemical composition provided by X-ray photoelectron spectroscopy showed that oxygen and nitrogen atoms are incorporated onto the surface. The polar oxygen groups formed on the surface lead to the increasing of the CF surface energy. The results of interlaminar shear strength test (short beam) of CFs/polypropylene composites demonstrated a greater shear resistance of the composites made with CFs treated by DBD than the one with untreated fibers. Both the increase in surface roughness and the surface oxidation contribute for the enhancement of CF adhesion properties. (AU)