화학공학소재연구정보센터
Macromolecular Research, Vol.17, No.1, 2-4, January, 2009
Preparation of Silver/PMMA Beads via the in Sito Reduction of a Silver Alkylcarbamate Complex
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  23. Poly(methylmethacrylate-co-ethyleneglycol dimethacrylate) (3-10 μm. 5% cross-linked) beads were purchased from Aldrich Chem. Co
  24. Electroless plating was carried out using a multi-step processes which included: etching, rinsing, conditioning, sensitization, activation, acceleration and electroless silver plating. MMA (5 g) beads were etched in NaOH (1 M, 500 mL) at 70 ℃ for 4 h prior to use, rinsed in distilled water, and conditioned in a solution of PEG-1000 (1 g) and water (500 mL) for 5 min. Surface sensitization was performed by immersing these beads on an aqueous solution containing SnCl2 (2 g) and water (100 mL) for 3 min. Beads were then rinsed in a solution of PdCl2 (1 g) and distilled water (1000 mL) for 3 min, and treated with 10% HCl (the accelerator). They were then rinsed with distilled water and completely dried at 40 ℃. These pretreated MMA beads (0.5 g) were then dispersed in a solution of PVP (0.1 g)/methanol (40 mL) in a polypropylene container (to avoid silvering of the reaction vessel). To this dispersion was added a solution of silver 2-ethylhexylcarbamate (0.3 g, silver content 10%) in methanol (10 mL) and a solution of hydrazine (0.2 g) in methanol (10 mL) with stirring to increase the density and thickness of the silver coating for 30 min. Finally, the PMMA-Ag composites were filtered and washed with methanol by centrifugation.
  25. The silver 2-ethylhexylcarbamate complex solution (Ag-EHCB, silver content, 10%) was supplied from Inktec Co. Ltd. (Korea)