Abstract
The effect of 8 MeV electron irradiation on the microstructure of the free volume in semicrystalline Polypropylene (PP) has been studied by Positron Annihilation Lifetime Spectroscopy (PALS). DSC has been employed to observe the variation in specific heat (Cp) as functions of electron dose and temperature. The Positron lifetime spectra for different electron doses are deconvoluted into three components, of which longest lived component (τ3) signifies the pick-off annihilation of o-Ps at free volume site which is related to the radius of the free volume holes. A gradual decrease in Cp values with increase of irradiation dose is found which may be expected as the free volume increases with the same.
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