Influence of blend composition and organic cloisite 15A content in the structure of isobutylene–isoprene rubber/ethylene propylene diene monomer composites for investigation of morphology and mechanical properties

Abstract

A melt mixing method was used for preparation of immiscible isobutylene–isoprene rubber/ethylene propylene diene monomer blends and their polymer nanocomposites containing cloisite 15A nanoparticles. The morphology of nanocomposites was characterized by Fourier transform infrared spectroscopy and scanning electron microscope techniques. The dispersion of nanoclay in isobutylene–isoprene rubber/ethylene propylene diene monomer blends was studied by transmission electron microscopy and XRD analyses. Curing data of the prepared nanocomposites showed a decrease in scorch time (t5) and optimum cure time (t90) with increasing nanoclay content. Intercalation of rubber chains into the organoclay silicate layers was specified by d-spacing amount estimated according to the XRD results. Based on XRD results, a leftward shift towards lower diffraction angles in the organoclay characteristic peak was observed, indicating an increase in the d-spacing values in comparison with the pure organoclay. It confirms the intercalation of elastomer chains into the nanoclay galleries. The mechanical properties of the polymer nanocomposite specimens including hardness, fatigue strength, elongation at break, modulus and tensile strength were found to be better with increasing the nanoclay content. Also, resilience of the polymer nanocomposites decreased.

Enhancement of thermal, morphological, and mechanical properties of compatibilized based onPA6‐enriched graphene oxide/EPDM‐g‐MA/CR: Graphene oxide andEPDM‐g‐MAcompatibilizer role

“…By dynamic curing, the properties of the finished product are greatly improved. [11][12][13][14] Despite all these interpretations, the PA6/chloroprene rubber (CR) blend, including nanocomposite hybrid rubber, are incompatible and immiscible. For this reason, a compatibilizers is used for the process of compatibility in blends to obtain the desired mechanical properties.…”

“…The properties of the materials undergoing the dynamic curing process are very different from those of similar noncured mixtures. By dynamic curing, the properties of the finished product are greatly improved 11–14 . Despite all these interpretations, the PA6/chloroprene rubber (CR) blend, including nanocomposite hybrid rubber, are incompatible and immiscible.…”

Enhanced compatibility, morphology, rheological and mechanical properties of carboxylated acrylonitrile butadiene rubber/chloroprene rubber/graphene nanocomposites: effect of compatibilizer and graphene content

“…2e) are increased. [22][23][24] To ensure the results of curing tests, at least 5 samples were taken from each test. The difference between tests was usually less than 5% on average.…”

“…In fact, XNBR-g-GMA compatibilizer and graphene as reinforcing agent not only improve the mechanical properties of nanocomposites, but also accelerate the curing process. 24 The reaction of sulfur results in an increase in the rate of curing reaction of the rubbers. The possible reaction of epoxide functional groups present in the XNBR-g-GMA compatibilizer and carboxyl groups present in XNBR and also p-p interaction of the C]C functional groups of CR and the graphene C]C groups can facilitate cross-linking reactions (Fig.…”

“…where, a, l, m, s 0 and h 0 are the Yasuda factor, the relaxation time, the dimensionless power index, the yield stress and the zero shear viscosity, respectively, and also, these parameters (according to Carreau-Yasuda model) are reported in Table 5. 24,43,44 Previous reports 45,46 show that higher yield stress values are directly correlated with better orientation of graphene nanoplatelets. Table 5 clearly shows that, by the adding compatibilizer and also increasing the graphene nanoplatelets content to 1 phr, the yield stress improves dramatically, indicating good dispersion and orientation in the XNBR/CR phase.…”