Thermo‐oxidative decomposition kinetics of elastomeric composites based on styrene‐(ethylene‐butylene)‐styrene triblock copolymer and organomontmorillonite

Abstract

ABSTRACT:The elastomeric nanocomposites based on organomontmorillonite (OMMT) and styrene-(ethylenebutylene)-styrene (SEBS) thermoplastic elastomer were prepared by melt processing using maleic anhydride grafted SEBS (SEBS-g-MA) as compatibilizer. Thermo-oxidative decomposition behavior of the neat components and the nanocomposites were investigated using thermogravimertic analysis (TGA) in air atmosphere. The isoconversional method is employed to study the kinetics of thermo-oxidative degradation. The heating modes and the composition of nanocomposites were found to affect the kinetic parameters (E a , lnA and n). The E a and lnA values of SEBS, OMMT, and their composites are much higher under dynamic heating than under isothermal heating. The reaction order (n) of OMMT was lower than those of SEBS and their composites. The obtained TG profiles and calculated kinetic parameters indicated that the incorporation of OMMT into SEBS significantly improved the thermal stability both under dynamic heating and under isothermal heating. The simultaneously obtained DSC data showed that the enthalpy of thermal decomposition decreased with OMMT loading. No significant change in the nonisothermal and isothermal stability of the nanocomposites with addition of SEBS-g-MA.

Thermal decomposition behavior and mechanical properties of elastomeric composites based on polyolefinic thermoplastic elastomer and organomontmorillonite

“…Although the effect of OMMT contents on XRD patterns of the composites have been investigated and the results are not shown here, no significant change in the XRD patterns is observed with OMMT loadings. As reported earlier in our work[17], the…”

“…Note XRD pattern of OMMT used in the present study possesses three characteristic reflection peaks at 2θ02.5, 4.3, and 7.2 corresponding to the d-spacing of 3.40, 2.10 and 1.27 nm, respectively. As compared with the XRD pattern of the neat OMMT [17], the sharp d 001 -plane spacing peak of OMMT in San-5 and San-5/1MA slightly shift to the lower diffraction angle, i.e., from 2θ02.5 (d-spacing03.40) for OMMT to 2θ 02.44 (dspacing03.58) for San-5. Meanwhile, the remarkable shift of the d 001 -plane spacing peak of OMMT to the lower angle is observed for San-5/5MA and San-5/ 10MA composites.…”

Ceramic nanoparticles and carbon nanotubes reinforced thermoplastic materials for piezocapacitive sensing applications

“…As shown in Figure 2a), both neat SEBS and SBS present a very similar spectrum, with characteristic styrene and butadiene absorption bands. Both SBS and SEBS present several absorption peaks in the 3000-2800 cm -1 region associated with the C-H aliphatic groups [33], together with sharp peaks located at 1493 and 1454 cm -1 arising from the aromatic C=C stretching of styrene [34]. The peak at 699 cm -1 results from the ring out-of-plane deformation vibrations of the phenyl group [35].…”

Styrene–butadiene–styrene/graphene nanocomposites with improved thermal oxidation stability

“…Saikrasun et al ., for example, manufactured SEBS/organic montmorillonite nanocomposites through melt blending and evaluated their thermal oxidation degradation process. They discovered that adding organic montmorillonite to SEBS enhanced its thermal stability 14 . A similar analytical approach was used by Saikrasun et al .…”

“…They discovered that adding organic montmorillonite to SEBS enhanced its thermal stability. 14 A similar analytical approach was used by Saikrasun et al to evaluate the effects of carbon nanotubes and montmorillonite on the thermal stability of SEBS, and satisfactory results were also obtained. 15 These investigations ignored the influence of nanofillers on SEBS phase structure, hence disregarding the synergistic effect of SEBS phase structure and nanofillers on the enhancement of thermal oxidation stability of SEBS nanocomposites.…”