Abstract
AbstractWe used Positron Annihilation Lifetime Spectroscopy (PALS) to investigate the effect of cross‐linking on the free volume properties of Natural Rubber (NR) composites. In order to form any meaningful product for industrial purposes, NR is mixed with different compounds, then cured in a process called vulcanization. One of the most important compounds used in the mixing process is sulfur. Sulfur forms cross‐links with NR restricting the mobility of the polymer chains. Addition of sulfur and vulcanization reduce the o‐Ps lifetime and intensity. By compating un‐vulcanized and vulcanized samples we show that sulfur inhibits Ps formation and that with cross‐link formation during vulcanization the o‐Ps lifetime and intensity both decrease with increasing sulfur concentration. Swelling measurements were also done using toluene absorption to measure cross–link density as a function of sulfur concentration. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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