Surface Modification and Electroless Copper Plating of Thermotropic Liquid Crystal Polymer Film
In this paper,thermotropic polyarylate liquid crystal polymer(TLCP)films were surface-etched and roughened using sodium hydroxide(NaOH)solution,then amino groups were introduced on the surface of the film by 3-aminopropyltriethoxysilane(KH550)to achieve surface activation by complexing silver ions with the amino groups,and then the films were palladium-free chemical copper plated,which improved the adhesion between the TLCP film and metallic copper.The TLCP films after surface treatment and chemical copper plating were characterized by scanning electron microscopy(SEM),contact angle measurement,X-ray diffractometer(XRD)and peel test.The effects of the concentration of NaOH solution,surface-roughing temperature and time and the composition of activation solution on electroless copper plating on TLCP films were discussed.The results show that the surface treatment produces uniform holes on the surface of the film,the contact angle decreases to 29.30°,and the hydrophilicity increases significantly.The plated copper layer is bright pink with metallic luster,dense and smooth,with high purity,and the thickness of the plated layer reaches 2.78μm,and the adhesion grade between the plated layer and the TLCP film reaches 5B.
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