Abstract
Polystyrene (PS) films were doped with electron-donating and electron-acceptive dopants, and their triboelectric charging behaviors when charged by contact with iron carrier beads were investigated under controlled atmospheres. Saturated surface potential (Vs) of the PS films was shifted to positive direction and the humidity dependence of Vs was decreased by the doping of donor dopants, while acceptor ones brought about the reverse changes. The magnitude of such changes in the charging characteristics seemed to be related to the length ofπ-conjugated systems of the dopants.
PS films doped with1-aminonaphthalene, AN (5-aminoquinoline, AQ) and 1-nitronaphthalene, NN (6-nitroquinoline, NQ) were compared with films doped with 1-amino-4-nitronaphthalene, ANN (5-amono-6-nitro-quinoline, ANQ). It was found that the charging behavior of the former films were govemed by the donor dopants (AN or AQ), while in the latter films electron acceptive groups also contributed to the triboelectric charging.
In addition, the effect of relative positions of electron-acceptive and electron-donative groups of the dopants on charging behaviors was examined using PS films doped with nitroaniline and nitropheno1, and it was revealed that the humidity dependence increased in order of o-<m-<p- positions.
