Abstract
Electron spin resonance (ESR) was used as a new method to analyze the synergy between two nanofillers dif-ferent by nature, form and rigidity dispersed in natural rubber matrix. Natural rubber (NR) nanocomposites loaded with fixed amount of carbon nanotubes (2 parts per hundred of rubber parts; phr) and various amounts of expanded organically modified montmorillonite (EOMt, 4–20 phr) were investigated. The dependence of the double integral of the resonance spectra on the amount of EOMt present in the natural rubber was established. Its decrease with an in-creaseof the amount of EOMt confirmed the synergy between these two nanofillers. Also DMA temperature sweep measurements were performed and the cluster-cluster aggregation (CCA) model was used to assess the apparent filler networking energy. The obtained results suggest that the presence of the EOMt above a critical amount strengthens the hybrid-filler networking.
Highlights
The electron spin resonance (ESR) spectroscopy is a powerful technique for the investigation of carbon-based materials
In our recent publication [13] we investigated Natural rubber (NR) based hybrid nanocomposites that contained 6 phr multiwalled carbon nanotubes (MWCNT) and various quantities of EOMt
The method of Electron spin resonance (ESR) can be successfully applied for analysis of the interactions between the MWCNTs and EOMt in NR hybrid filler nanocomposites
Summary
The electron spin resonance (ESR) spectroscopy is a powerful technique for the investigation of carbon-based materials. In our recent publication [13] we investigated NR based hybrid nanocomposites that contained 6 phr multiwalled carbon nanotubes (MWCNT) and various quantities of EOMt. The obtained ESR spectra had a symmetrical Lorentzian shape for all nanocomposites, indicating good dispersion of the MWCNT throughout the NR matrix, regardless of the EOMt presence and quantity.
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