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We present the time evolution of polycarbonate and polystyrene free volume probed by positron annihilation lifetime spectroscopy, which occurs after thermal rejuvenation above the glass transition temperature (T_g) and after plastic deformation via cold rolling. The ortho-positronium (τ_{o-Ps}) lifetime and its intensity (I_{o-Ps}) are used to characterise, respectively, size and concentration of...
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