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Physical and chemical changes in polystyrene during electron irradiation using EELS in the TEM: contribution of the dielectric function

We have performed electron energy‐loss spectroscopy analysis of polystyrene in the analytical transmission electron microscope in order to evaluate the possibility of obtaining both chemical and dielectric information on the polymer at the submicrometre scale. Irradiation has also been studied, particularly the influence of the specimen temperature on the kinetics of degradation.