DDACLB膜的电学性质研究（I）-电导率

沉积在聚脂基片上的表面软化剂DDAC多分子层，在不同的湿度条件下，其横向导电特性标志该表面活性剂在纤维表面处理过程中驱除静电能力的大小。由原子力显微镜（AFM）图像表明，DDAC的2、4、8多分子层薄膜上的结晶颗粒随层数的增加而增大，因此采用电导率描述其导电性质并借助薄膜电阻加以解释。对复合分子层的电导率的非线性变化除借用了半导体物理学中的渗透理论（PercolationTheory）加以解释外，还建立了线束重叠（Patch-Overlapping）模型以讨论电流渗透中的饱和现象。得出了提高相对湿度对可使流经多分子层的电流强度增加的结论同时又对膜厚、湿度对电流强度的贡献及其相互制约的关系提出了理论解释。

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

The capability of lateral dissipating 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 DDAC multi-layers which may result in the non-liner relationships between lateral conductance and relative humidities(RH)ambient.Based on the data of current and voltage applied,the sheet resistance of deposited DDAC films have been calculated.Percolation theory and patch-overlapping models at different RH have been employed to interpret these non-linear relationships for DDAC multi-layers.It has been found out that the current 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.