The influence of dispersants that contain polyethylene oxide groups on the electrical resistivity of silver paste



This study investigated the effects of dispersants on the electrical resistivity of silver pastes. The dispersants in the polyoxy ethylene-p-(1,1,3,3-tetramethylbutyl) phenyl ethers system contain several polyethylene oxide (PEO) groups (m), which are affect the viscosity and electrical resistivity of the silver pastes. The morphologies of the cured silver pastes for different dispersants and different content were obtained by scanning electronic microscopy. In this study, octylphenol ethylene oxide condensate, poly(oxyethylene) isooctylphenyl ether (X-100, the number of PEO groups was m = 9.5) has excellent ability to disperse silver particles. A loading of 75 wt % of silver powder was used to prepare silver paste that contained 0.8 wt % of X-100. This paste had the lowest viscosity and the lowest electrical resistivity of cured silver paste on the indium tin oxide (ITO) film and ITO glass, i.e., 5.52 × 10−5 and 6.82 × 10−5 Ω cm. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41183.