Microstructure development and mechanical performance of MWCNTs/GNPs filled SEBS with different block content

Abstract

Polystyrene‐poly (ethylene‐butylene)‐polystyrene (SEBS) nanocomposites have been regarded as promising thermoplastic elastomers for several industries owing to their distinct molecular platforms and properties. However, extending their applications requires a thorough understanding of the microstructural changes that nanoparticles induce in SEBS chains. In this work, we used two types of SEBS varying in polystyrene (PS) hard block contents to study the relationship between the structural changes and viscoelastic/mechanical properties of SEBS hybrid nanocomposites containing different multi‐walled carbon nanotubes: graphene nanoplatelets ratios. According to the results, the viscoelastic responses were strongly influenced by the PS block content and nanoparticles ratio, which had an appreciable contribution to the nanoparticles' dispersion state. This was explained in terms of intensified microphase separation induced by the favorable interactions between the carbon‐based nanoparticles and PS blocks. It was also found that the samples containing higher hard block content demonstrated more significant mechanical performance and toughness, which were enhanced by the addition of nanoparticles such that the highest ultimate strength of 24.58 MPa was obtained for the S30C0.5G0.5 sample. Furthermore, some mechanisms, including molecular disentanglements, dissociation of inter/intra‐molecular interactions, the orientation of the rubbery polyethylene butylene chains, and PS microdomain rearrangement, were supposed to interpret the energy dissipation capability of SEBS nanocomposites.

Mechanical and thermal characterization of elastomer modified polypropylene hybrid composites reinforced with hazelnut shell and wollastonite fillers

“…It is believed that this improvement is due to the superior energy dissipation capacity of SEBS, as known from the literature, in comparison to other materials in the mixture, with the aim of enhancing impact resistance. 38,39 The impact strength of SEBS-g-MA was more prominent compared to SEBS, and this is thought to be attributed to the presence of MA in SEBS-g-MA, which improves interfacial properties, resulting in a longer-chain and more regular structure, and consequently, an improvement in mechanical properties. 40 The highest hardness value was measured in pure PP.…”

Low percolation threshold polyvinylidene fluoride/multi‐walled carbon nanotube composites: A perspective of electrical conductivity, crystalline, rheological and mechanical properties

“…For CPC, the percolation threshold is the minimum amount of conductive filler needed to make the composite electrically conductive 21 . Common conductive fillers 22 used in CPC include metals, metal oxides, magnetic ferrites, and carbon‐based materials, 23,24 etc. The conductivity of CPC is directly connected with the amount of conductive fillers present 25 .…”