Molecular charge states and contact charge exchange in polymers

Abstract

Observation of a new phenomenon, the reversible change in sign of charge transferred to a polymer upon sequential contacts with a series of metals, is reported. This observation is interpreted using a model which attributes the polymer charges to the occurrence of local intrinsic molecular-ion states. A phenomenological representation both of these charge states and of the metal/polymer contact charge exchange process is developed. The validity of this phenomenology is tested by comparing its predictions with a systematic study of the contact charging of poly(styrene), poly(methyl methacrylate), and copolymers thereof. Using the contact charge exchange spectra of poly(styrene) and poly(methyl methacrylate) to determine the input parameters, the phenomenological model successfully predicts the contact charge exchange spectra of the copolymers.

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“…The data in Tables III and IV show that the repetition rate is both field and temperature dependent, which would be consistent with a number of interface processes. The lack of detailed knowledge of the interface 28,[41][42][43][44] however, makes it impossible to make an analytical calculation of surface charge replenishment via transfer of charge to surface states, either from the electrode or by ionisation of impurity molecules located in the surface region.…”

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