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Bayat, Hossein
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article
An experimental study on one-step and two-step foaming of natural rubber/silica nanocomposites
Abstract
<jats:title>Abstract</jats:title><jats:p>The curing and cellular structure of natural rubber (NR)/silica composite foams wereinvestigated. The presence of an activator in the rubber formulation significantlylowered the decomposition temperature of the azodicarbonamide foaming agent, whichallowed foaming before NR curing. Therefore, two foam methods were designed: foaminginitially at 90°C and then curing at 140°C, and foaming and curingsimultaneously at 140°C. Two-step foaming generated a lower cell density andhigher cell size. Incorporation of nano silica into NR increased the foam density,but decreased the cell size. The higher foaming temperature restricted the bubblegrowth because of a higher curing rate and inhibited cell coalescence.</jats:p>