Synthesis and characterization of novel SEBS-g-MA/OMMT nanocomposites with thermal and mechanical resilience

A hybrid polymer nanocomposite polystyrene-b-poly(ethylene-ran-butylene)-b-polystyrene-grafted maleic anhydride with organically modified montmorillonite; SEBS-g-MA/OMMT was synthesized through solution casting methodology with varying clay proportions. The organophilic character was introduced into the inorganic clay platelets using 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPPP) as an intercalating mediator employing ion interchange process which was confirmed by XRD patterns. Nanocomposite films were investigated by FTIR, XRD, and SEM for their morphology. XRD pattern of the nanocomposite film revealed the homogeneous dispersion of platelets into the matrix, thus responsible for the improved material properties. Enhanced forces of adhesion led to a compatibilized system as depicted by scanning electron micrographs. Fine dispersion and smooth surface particles were exfoliated and were unidentified under the microscope. SEBS-g-MA showed improved mechanical strength up to 8% clay content based on tensile tests. When the mechanical strength of the nanocomposite was examined with its clay content, a 90% increase in modulus was found when compared to the original polymer matrix. Thermal decomposition temperatures of the nanocomposite ranged from 365 to 446 °C. With increasing clay loading, the nanocomposite exhibited thermal stability greater than pure polymers under similar conditions.