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Role of Electron‐Donative Dopant Molecules in the Triboelectrification of Polystyrene Films
Author(s) -
Hoshino Katsuyoshi,
Ohoka Haruhi,
Kokado Hiroshi,
Kitamura Takashi
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010201)202:3<367::aid-macp367>3.0.co;2-w
Subject(s) - dopant , polystyrene , triboelectric effect , chemistry , electrochemistry , x ray photoelectron spectroscopy , molecule , doping , dispersion (optics) , homo/lumo , photochemistry , chemical physics , electron affinity (data page) , electron , chemical engineering , materials science , organic chemistry , electrode , polymer , optoelectronics , optics , physics , engineering , quantum mechanics
The triboelectrification between iron carrier beads and polystyrene films molecularly‐doped with 50 electron‐donative organics are investigated in a nitrogen atmosphere and low humidity (<10% RH) conditions. The electrochemical oxidation potential of the dopants correlates well with the tribocharging amount within the framework of a homologous series of dopant molecules, but turns out not to be a widely applicable and reliable indication. Considerations of liquid‐phase electrochemical oxidations and solid‐phase frictional electrifications lead us to use calculated oxidation potentials instead of the measured one, and it is revealed that a relatively good relation holds between the calculated potential and the charging amount. However, there still exists some dispersion of the data in the relationship. X‐ray photoelectron spectroscopic measurements of the film surfaces, combined with the above findings, reveal that the dopants form charge transfer complexes with environmental dioxygen and that they serve as the positive‐charging sites. This is evidenced by an even more reliable relationship between the charging amount and the binding energy of O1s electrons. A possible mechanism is proposed for the positive charging of organic compounds on the basis of the charge‐transfer model.