Cationization of Cotton Fibers by Polyethyleneimine Treatment and Its Application to Copper Sulfide Plating
Vol. 55, No. 3, pp. 143-151,
Jun. 2018
10.12772/TSE.2018.55.143
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Abstract
Cotton fabrics were treated with polyethyleneimine (PEI), in order to cationize
cellulose fibers and convert them into electro-conductive fibers by electroless plating of copper sulfide (CuS), using the introduced functional groups. As the PEI concentration increased and the treatment temperature decreased, the add-on (weight increase after treatment) of the PEI-treated fabric increased. However, treatment times of more than 30 minutes did not further affect the add-on. The PEI-treated cotton fabrics could be dyed with an acid dye, confirming that the fabrics were cationized. The apparent dye uptake according to the Mubelka-Munk equation (K/S value) of the dyed samples increased sharply with increasing PEI concentration, reached a maximum at 0.01 %(w/v), and then decreased with further increases in PEI concentration. These results indicate that a PEI concentration as low as 0.01% was sufficient for the cationization of cotton fibers. The PEI-pretreated cotton fabrics were electroless plated with CuS, using solutions containing both CuSO4 and Na2S2O3 and the electrical conductivity was compared by measuring the surface resistance. When a 4% (w/v) CuSO4 and 4% (w/v) Na2S2O3 solution was used for plating at 80 °C, the CuS plated samples showed a very low surface resistance of 1−2 Ω/sq. Although the maximum K/S value of the dyed fabric was obtained at 0.01% PEI concentration, the surface resistance of the samples decreased continuously, before reaching an almost constant value at the PEI concentration of 0.5%.
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