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Fig. 2 Tribo charging process. When two different materials are brought into contact, there will be a transfer of charge from one material to the other in order to eliminate the imbalance of charge. The magnitude and direction of the charge transfer depends on many factors including the chemical and electronic structure of both materials. Over the years, a lot of testing has been done contacting one material against another and measuring the resulting magnitude and polarity of the charge attained on each of the materials. The results of one such study, presented in the form of a so-called "triboelectric series," are shown in Table I. The farther two materials are away from each other in the series, the greater the triboelectric charge that should be produced when these two materials come in contact. Note that polytetrafluoroethylene (PTFE) is shown at one end of the series as being the strongest electron acceptor and nylon 6/6 is shown at the other end as being the strongest electron donor. According to this study, all materials that contact Electron Donor (+) Nylon 6/6 Cellulose Cellulose acetate Polymethyl methacrylate Polyacetal Polyethylene terephthalate Polyacrylonitrile Polyvinyl chloride Polybisphenol carbonate Polychloroether Polyvinylidene chloride Polystyrene Polyethylene Polyproplene Polytetrafluoroethylene Electron Acceptor (-) Table I. Triboelectric Series 221

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