Effect of sizing on carbon fiber surface properties and fibers/epoxy interfacial adhesion

Abstract This paper aims to study effect of sizing on surface properties of carbon fiber and the fiber/epoxy interfacial adhesion by comparing sized and desized T300B and T700SC carbon fibers. By means of X-ray photoelectron spectroscopy (XPS), activated carbon atoms can be detected, which are defined as the carbon atoms conjunction with oxygen and nitrogen. Surface chemistry analysis shows that the desized carbon fibers present less concentration of activated carbon, especially those connect with the hydroxyl and epoxy groups. Inverse gas chromatography (IGC) analysis reveals that the desized carbon fibers have larger dispersive surface energy γ S D and smaller polar component γ S S P than the commercial sized ones. Moreover, micro-droplet test shows that the interfacial shear strength (IFSS) of the desized carbon fiber/epoxy is higher than those of the T300B and T700SC. Variations of the IFSS for both the sized and desized carbon fibers correspond to γ S D / γ S tendency of the fiber surface, however the work of adhesion does not reveal close correlation with IFSS trend for different fiber/epoxy systems.

[1]  F. Fowkes.  ATTRACTIVE FORCES AT INTERFACES , 1964 .

[2]  Peng Li,et al.  Effect of new epoxy matrix for T800 carbon fiber/epoxy filament wound composites , 2007 .

[3]  Wolfgang Gindl,et al.  A comparison of different methods to calculate the surface free energy of wood using contact angle measurements , 2001 .

[4]  L. Drzal,et al.  The role of chemical bonding and surface topography in adhesion between carbon fibers and epoxy matrices , 1996 .

[5]  J. Paulo Davim,et al.  Delamination analysis in high speed drilling of carbon fiber reinforced plastics (CFRP) using artificial neural network model , 2008 .

[6]  A. V. van Asten,et al.  Surface characterization of industrial fibers with inverse gas chromatography. , 2000, Journal of chromatography. A.

[7]  L. Lavielle,et al.  The Role of the Interface in Carbon Fibre-Epoxy Composites , 1987 .

[8]  N. Dilsiz,et al.  Effect of acid–base properties of unsized and sized carbon fibers on fiber/epoxy matrix adhesion ☆ , 2000 .

[9]  B. Grady,et al.  Wetting Behavior of Elastomer-Modified Glass Fibers , 2001 .

[10]  B. Riedl,et al.  Inverse gas chromatography study on partially esterified paper fiber. , 2002, Journal of chromatography. A.

[11]  P. Askeland,et al.  Effect of surface oxygen content and roughness on interfacial adhesion in carbon fiber–polycarbonate composites , 2002 .

[12]  N. Dilsiz,et al.  Surface analysis of unsized and sized carbon fibers , 1999 .

[13]  L. J. Bonis.  SURFACE ANALYSIS - "Interdisciplinary Aspects of Surface Phenomena" , 1964 .

[14]  C. Galiotis,et al.  Effect of fibre sizing on the stress transfer efficiency in carbon/epoxy model composites , 1996 .

[15]  Yudong Huang,et al.  Effect of epoxy coatings on carbon fibers during manufacture of carbon fiber reinforced resin matrix composites , 2010 .

[16]  J. Watts,et al.  A study of electrochemically treated PAN based carbon fibres by IGC and XPS , 2007 .

[17]  J. Tascón,et al.  Effects of plasma oxidation on the surface and interfacial properties of carbon fibres/ polycarbonate composites , 2001 .

[18]  A. Heiningen,et al.  Inverse gas chromatography for the determination of the dispersive surface free energy and acid–base interactions of a sheet molding compound. I. Matrix material and glass , 2008 .

[19]  L. Drzal,et al.  Adhesion of Graphite Fibers to Epoxy Matrices: I. The Role of Fiber Surface Treatment , 1983 .

[20]  M. Chaudhury,et al.  Additive and nonadditive surface tension components and the interpretation of contact angles , 1988 .

[21]  L. Drzal,et al.  Adhesion of Graphite Fibers to Epoxy Matrices: II. The Effect of Fiber Finish , 1983 .

[22]  Robiah Yunus,et al.  Effect of fiber length on thermomechanical properties of short carbon fiber reinforced polypropylene composites , 2009 .