Abstract
In recent decades, the relevance of recyclability and reprocessability of cross-linked elastomers has increased rapidly, especially taking into account that cross-linked elastomers constitute a great mass of non-recyclable and non-biodegradable waste. This research article highlights some key impacts of using stearic acid at different dosage levels in zinc-based maleated ethylene propylene (M-EPM) ionomers. As inferred from several experimental analysis, a relatively small amount of stearic acid (7.5–10 phr) is sufficient to yield similar properties as one would obtain from the high dosage of conventional ionic plasticizer (10–30 phr) in zinc-based M-EPM ionomer system. All samples were easily prepared by a general rubber processing equipments like internal mixer, two-roll mill, electrically heated hydraulic press, etc. Additionally, 7.5–10 phr of stearic acid can make Zn based M-EPM ionomer reprocessable at high temperature (≥150 °C), exhibiting a typical thermoplastic behavior. Samples were studied using general characterization techniques such as, ODR, DMTA, FTIR, AFM, and TEM analysis. A phenomenal ten-fold rise in the tensile strength, and a significant improvement in the hardness (Shore A) values were observed after the addition of 7.5–10 phr of stearic acid in zinc-based M-EPM ionomer system.
Published Version
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