Abstract
AbstractThe free volume behavior as a function of time during curing of natural rubber‐carbon black composites studied by positron annihilation lifetime spectroscopy (PALS) is reported. The lifetime and intensity of the ortho‐positronium (o‐Ps) pick‐off annihilation, which correlate with the average size and the number of holes respectively, were measured as a function of curing time. The samples were cured at 160 °C, while all PALS measurements were made at room temperature. Results for curing D706 (Duradene‐706), a synthetic rubber is also reported and compared with those found from natural rubber (NR). (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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