Abstract
AbstractPositron annihilation spectroscopy with its special methods of positron annihilation lifetime spectroscopy (PALS), Doppler‐broadening of annihilation radiation, and angular correlation of annihilation radiation represents an important experimental tool for the study of the free volumes in amorphous and semicrystalline polymers. From PALS, the most important technique for the investigation of polymers and other molecular materials, the size distribution of subnanometer‐size local free volumes (holes) can be determined. The fundamentals and experimental techniques of this method for the investigation of bulk and near‐surface properties are outlined. Typical examples for the study of the temperature and pressure dependence of the free volume and the effect of chemical heterogeneities on PALS are presented.
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