Abstract
AbstractThe effect of hexamine (HA) addition on the morphological, thermal, mechanical, and dielectric properties of acrylonitrile butadiene rubber (NBR) composites has been considered. In this regard, HA was composited with NBR in different part percentages. The prepared formulations were characterized by using ATR‐FTIR and mapped with AFM for their topographical features which revealed multiple protrusions and showed that HA was distributed in the form of clustered crystals on the rubber surface and within the rubber matrix. The investigated data revealed that the tensile strength, elongation, and shore A hardness were improved with addition and increasing HA ratio till 50 phr then reneged. The thermal gravimetric analysis (TGA) showed a graduated decreasing effect on the thermal stability by addition of HA. Moreover, upon increasing the proportion of HA in the composite, the electrical resistivity was dropped by several orders of magnitude at a critical filler concentration. The conductivity through composite material is described as a transport mechanism that involves electrons tunneling through the gaps founded in between of the two discontinuous conducting elements and a continuous conducting network forming. Experimental and calculated values of electrical resistivity showed close similarity only at higher HA loading ratios.
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