Influence of hybrid nanostructures and its tailoring mechanism on permeability, rheology, conductivity, and adhesion properties of a novel rubber blend nanocomposite

Abstract

The present work provides an extensive insight on effect of hybrid nanofillers and its structure-property relationship in nanocomposites based on bromobutyl rubber (BIIR)/ polyepichlorohydrin rubber (CO) blends. TEM photomicrographs reveal high degrees of dispersion of nanoclay with the formation of hybrid nanostructures. Rheological behavior of the nanocomposites displays shear thinning nature and significant reduction of die swell (up to 13% reduction) is observed with increase in the dosage of nanoclay. The addition of the nanoclay drastically reduces the air permeability up to 17%, increases electrical conductivity and thermal conductivity of the rubber nanocomposites. Adhesion of rubber to the fabric ply is found to be good in the nanocomposite having a lower dosage of nanoclay. These unique attributes were found to stem from the fundamental viscoelastic characteristics i.e., increase in the entanglement density due to the hybrid nanostructures. The development of hybrid nanostructures and its significant contribution to the improvements of properties are schematically explained. Rubber formulations with such suitably tailor nanostructures will find their applications for next generation rubber based industrial products. 23to the low free path of the phonon and frequent phonon scattering effect at the rubber interface, the net thermal conductivity of B 90 H 10 CB 50 NC 0 is less. Scheme 5 explains the effect of hybrid nanostructure in enhancing the thermal conductivity of the nanocomposites. The dispersed hybrid nanostructures bridges between the BIIR-CO interface and acts as an extended path for the phonons to travel. The extended mean free path of phonons have now become to (λ+x) and (λ+y) from λ before it gets scattered. The increase in the mean free path corresponds to the increase in the thermal conductivity of the nanocomposites. However, relative decrease in the thermal conductivity of B 90 H 10 CB 50 NC 10 with increase in the temperature corresponds to the increase in the number of structural defects in the nanocomposites at higher temperatures. 32Scheme 5: Increase in the mean free path due to the formation of hybrid nanostructure in BIIR-CO nanocomposites 4.7. Adhesion Strength.Adhesion between the components is a basic requisite of any composite product when it is subjected to dynamic applications. The effect of nanoclay on the adhesion of the nanocomposites with neighboring fabric compound were analyzed and shown in Figure

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