Abstract:

In the preparation of polymer antistatic composites using conductive fillers， the addition amount of a conductive filler directly determines the conductivity of the resulting composites； however， the microscopic morphology of the conductive filler inventively affects the efficacy of the conductive channel. Polypyrrole （PPy） materials with different network structural features were prepared by using a soft template， and the PPy/polyurethane （PU） composites were prepared through solution blending. The effect of structural difference in PPy on the electrical conductivity of the composites was investigated. The electrical conductivity of PPy/PU composites at a PPY addition amount of 1 wt%~3 wt% was analyzed by using networked PPy materials with a line diameter in the ranges of 20~35 nm and 30~50 nm， and their electrical conductivities reached were an order of 10^-7 S/m compaed to the PPy particles. The composites all showed a decrease in electrical conductivity under 100 %~500 % deformation. However， the electrical conductivity of the networked PPy/PU composites only decreased by one order of magnitude， and the electrical conductivies of the composites containing 1 wt% and 3 wt% PPy particles were identical. The results indicated that the native network of the networked conductive filler could maintain the integrity of conductive channels in the composites under deformation of the composites. This allows the materials to maintain a high conductivity under deformation.

Key words: networked polypyrrole, antistatic composite, deformation condition, conductive property