Electrical Properties of L-B Multilayers of DDAC (Ⅰ)——Conductivity

The capability of lateral dissipahng static charge characterizes the electrical properties of a fabric softener that can be absorbed on fabric surfaces as mono -layer or multi -layers after washing. The DDAC LB multi-layers have been deposited onto thin polyester substrates.Under different relative humidities, the lateral conductance have been measured and non-liner results have been obtained. The atomic force microscopy （AFM） images show non-uniformity of DDA multi-layers which may result in the non-liner relationships between lateral conductance and reative humidities （RH） ambient. Based on the data of current and voltage applied, the sheet resistance of deposited DDAC films have been calculatal. Percolation theory and patch-overlapping models at different RH have been employed to interpret these non-linear relationships for DDAC multi-layers. lt has been found out that the unrrent flowing through the multilayers is controlled by relative humidities and the relationship between the thickness of the multilayers and the RH also does great contribution to the lateral conductance. Based on these, a theoretical explanation and analysis have been given.