Fabrication of electromagnetic shielding polyester fabrics with carboxymethyl chitosan-palladium complexes activation |
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Authors: | Y Shen H F Zhang L M Wang L H Xu Y Ding |
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Institution: | 1. College of Fashion, Shanghai University of Engineering Science, Shanghai, China 2. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
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Abstract: | Electromagnetic shielding polyester fabrics were prepared using carboxymethyl chitosan-palladium (CMCS-Pd) complexes as activation solution, followed by electroless nickel plating. CMCS-Pd complexes were prepared by the complexing adsorption between CMCS and Pd2+. The effects of reaction time and pH value on the adsorption of Pd2+ by CMCS were discussed. The maximum adsorption capacity was calculated as 4.27 mmol/g. CMCS-Pd complexes were characterized by ultraviolet (UV) spectrophotometer and Fourier transform-infrared (FTIR) spectroscopy. The induction time of electroless plating decreased gradually with the increase of Pd2+ concentration. The lowest surface resistance 125 mΩ/sq of the treated polyester fabric was obtained when Pd2+ concentration in CMCS-Pd complex was 1.5 g/l. The prepared polyester fabrics had excellent electromagnetic shielding effectiveness (SE) of 40–60 dB. The treated polyester fabrics were also characterized by scanning electron microscopy (SEM). Results showed that CMCS-Pd was effective to form an active catalyzed layer on polyester substrate and the 1.5 g/l Pd2+ was sufficient to initiate electroless nickel plating reaction. The CMCS-Pd complex activation and electroless nickel plating treatment caused small changes in the polyester fabrics’ tensile strength and air permeability. |
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