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SynopsisA simple method for the iodine doping of atactic polystyrene films is described. The marked changes in the physical properties of the polystyrene films, such as dielectric constant, optical absorption coefficient, and thermal diffusivity, are presented as a function of the doping time. The results show strong evidences of the onset of an order-disorder transition as a function of the doping time.

An iodine-incorporated polymeric film, based on a solid-state charge-transfer complex between polystyrene and iodine, is described. The material prepared, originally red, can be marked (changing to transparent) by an Ar+ laser beam. Possible photochemical and photothermal mechanisms for such transformation are proposed. The laser print can be erased by exposing the film to I2 vapor. Besides its use as a laser-beam diagnostic material, possible future applications include optical storage devices.

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