Luminescence spectra of anthracene solutions in polyethylene matrices were studied for various solute concentrations at 77°K. The impurity spectrum appeared to be a summation of at least two spectra corresponding to different types of interstitial dispersion of anthracene in crystalline and amorpous regions of polyethylene. The sensitivity of impurity electronic spectra to structural effectson the polymer matrix (variation in crystallinity, quenching) was found to be high. This leads to the assumption that impurity electronic spectra may serve as an “indicator” of structural transformations in the polymer (this possibility is illustrated with the cold‐drawing of polyethylene). Also noted were unusually large energy spacings for electron transitions which occur with different interstitial arrangements of impurity in polyethylene. These result from specific intermolecular interactions within the crystalline and amorphous regions, and thus characterize the morphology of the polymer.
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