Abstract
The influence of two types of sizings (3#, 4#) on the surface of carbon fibres, and interface of carbon fibre composites were investigated. It was found that the surface topography of carbon fibres studied appeared to consist of grooves along the fibre axial direction. Sizing decreased the roughness of fibres surface, and the surface roughness value (Ra) for the 3# sized fibre was higher than that of the 4# sized fibre. X-ray photoelectron spectroscopy (XPS) result shows that the percentages of functional group –C–OH or –C–OR on the 4# sized fibre was less than that of 3# sized fibre, but the percentages of functional group containing oxygen -C = O on the 4# sized fibre was more than that of 3# sized fibre. The 4# sizing can improve the soakage of LY-1 epoxy resin to carbon fibre when compared to the 3# sizing. In addition, the IFSS of 4# sized fibre/LY-1 epoxy resin monofilament composite was 44·66 MPa, presenting 120% higher than 3# sized fibre. Therefore, 4# sized fibre has a stronger bond with the resin matrix compared with 3# sizing fibre.
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