Reinforcing mechanisms of carbon nanotubes and high structure carbon black in natural rubber/styrene-butadiene rubber blend prepared by mechanical mixing − effect of bound rubber

Abstract

The reinforcing effect of high structure carbon black (HSCB) and multi‐walled carbon nanotubes (MWCNTs) on natural rubber/styrene‐butadiene rubber blend processed using mechanical mixing was comparatively investigated. In‐depth analysis by dynamic mechanical analysis, the Eggers − Schummer model and Medalia's relationship showed that HSCB aggregates provided large internal pores leading to significant immobilized macromolecules in filled rubber. Additionally, a tubular immobilized rubber layer with a thickness of 8 nm was estimated for the rubber/MWCNT system based on dynamic mechanical analysis data. The mechanical performance of the HSCB filled blend was higher than that of the MWCNT filled blend at the same loading which was correlated to its higher bound rubber content. Both bound rubber content and filler anisotropy were found to govern the overall mechanical properties of rubber/MWCNT composites. Stress softening was correlated with rupture energy suggesting hysteretic failure mechanisms in both MWCNT and HSCB filled rubbers. © 2015 Society of Chemical Industry

Evaluation of spectral, thermal, flame retardant, dielectric, solvent diffusion, and transport behavior of novel nanocomposite derived from chlorinated styrene butadiene rubber and manganous tungstate

“…The tensile strength, oil, and flame resistance of SBR were enhanced by the introduction of polar group in the rubber such as chloro functional group. Halogenated polymers are widely applicable in engineering applications due to the improved physico‐mechanical properties, high dielectric characteristics, resistant to chemicals, oil, and good adhesion to metals . The reaction of alkenes with dichlorocarbene generated from the in situ reaction of chloroform with alkali is a simple route of introducing chlorine atoms into polymer macromolecules; in fact, this is a simple alternative to chlorination and hydro‐chlorination .…”

Influence of poly(methyl methacrylate) grafted multiwalled carbon nanotubes on the mechanical and thermal properties of natural rubber nanocomposites

“…This observation was in accordance with the work reported already on the effect of the high aspect ratio of CNT to modulate the NR properties. 6,7,25 Nevertheless, the decrease is not all that dramatic as the differences were not much between two close filler loadings as shown clearly in Table 2. This may be attributed to the presences of PMMA on the surface of the modified MWCNT, which reduces the aggregation and enhance dispersion of the filler within the NR matrix.…”

“…The enhancement of NR/MWCNT modulus and strength was due to the high level of dispersion of high aspect ratio MWCNT bundles within the NR matrix. 6,7,25 Figure 2 displays the stress-strain curves of MWCNT-g-PMMA/NR nanocomposites including that of the controls of unfilled NR, CB N330, and pristine MWCNT composites. It is noteworthy to observe that from the control composites up to the higher filler loading nanocomposite elastic modulus at and 200% of the composites increased, while the percentage elongation at break decreased.…”

In situ preparation and characterization of biocompatible acrylate‐terminated polyurethane containing chemically modified multiwalled carbon nanotube

“…Carbon nanotube (CNT), a carbon‐based nanoparticle composed of rolled‐up graphite planes, recently has attained enormous attention due to its unique structure (e.g., high flexibility, large specific surface area and big aspect ratio), superior mechanical, thermal and electrical properties as well as biocompatibility . Indeed combination of these properties makes CNT a promising material for bone cement , tissue engineering, biosensors , drug and vaccine delivery systems .…”