SEARCH Articles Figures Tables Free volume positron annihilation lifetime spectroscopy Lifetime spectroscopy Positron Positron annihilation lifetime spectroscopy Positron annihilation lifetime spectroscopy PALS), free volume Positron annihilation lifetime spectroscopy PALS), polymer transport properties Positron annihilation lifetime spectroscopy free volume polymers Positron annihilation lifetime spectroscopy high free volume polymers Positron annihilation lifetime spectroscopy polymers Positron annihilation lifetime spectroscopy volume Positron annihilation lifetime spectroscopy volume holes Positron annihilation lifetime spectroscopy, PALS Positron lifetimes Positron spectroscopy Small Angle X-ray Diffraction Scattering and Positron Annihilation Lifetime Spectroscopy