Effects of Ultraviolet Irradiation and Chitosan Grafting Combined Treatment on the Surface Modification of ABS

Abstract

Polyacrylonitrile-butadiene-styrene(ABS) is a widely used engineering plastic. In this study, the surface of the ABS substrate was modified by combining green UV irradiation surface modification technology with chitosan grafting technology. The effects of ultraviolet irradiation conditions, concentration of chitosan acetate solution, modification temperature and modification time on the ABS substrate surface morphology, roughness, hydrophilicity and chemical properties were investigated. Firstly, the ABS was irradiated at 300 W for 30 min by using 2 g/L titanium dioxide(TiO2) as a photocatalyst, and then it was modified with a 0.75 g/L chitosan acetic acid solution at 70 ℃ for 30 min. The surface morphology change of the ABS substrate was observed using scanning electron microscopy(SEM) and atomic force microscopy(AFM), and the hydrophilicity change of the ABS substrates surface was analyzed using a surface contact angle measuring instrument and X-ray photoelectron spectroscopy(XPS). Results showed that after UV irradiation and chitosan grafting modification, the ABS substrate surface developed a small number of tiny holes, exhibited low surface roughness, and displayed a significant increase in the concentration of hydrophilic groups. Consequently, the surface hydrophilicity was significantly enhanced. Furthermore, the electroless copper plating layer appeared smooth, with a pink color and metallic luster.

Keywords

• ultraviolet irradiation; chitosan grafting; surface modification of abs substrates; electroless plating