Rubber nanocomposites MWCNTs

Figure 19a, b compares the storage modulus as well as tan 8 for various nanocomposites prepared from EVA rubber having 50% vinyl acetate content and loaded with MWCNT, as a function of temperature [162]. Throughout the experimental temperature range of —35 to 20°C, the storage moduli show steady increase from the virgin rubber with the increase in MWCNT level (see Fig. 19a). For example, there is...

Sanchez studied the functionalization of oxidized SWCNTs and MWCNTs dispersed in thermoplastic elastomers based on poly(butylene terephthalate) (PBT)/ poly(tetramethylene oxide) (PTMO). These nanocomposites showed good dispersion and enhancement in thermo-oxidative stability [27]. 1 % of pristine multi-walled carbon nanotube (MWCNTs) were dispersed in silicon rubber. The SR nanocomposites showed 28 % better thermal stability and 100 % improvement in the ultimate tensile strength is achieved as compared with the pristine polymer matrix counterpart [28]. Also ionic liquids have been tested to improve the dispersion and thermal stability of MWCNTs in polychloroprene rubber (CR) showing improvement in these properties [29]. On the other hand the effect of carbon nanofiber on nitrile rubber was studied. It has been found that the nanofiber increase the thermal stability and decrease the flammability [4]. 

At the same time, Peddini et al. described the preparation of nanocomposites from styrene-butadiene mbber (SBR) and multiwall carbon nanotubes (MWCNT). MWCNT are important nanostructures due to the exceptionally high modulus and aspect ratios there has been much interest in using them as reinforcing agents for polymer composites. Styrene-butadiene rubber (SBR), commonly used as a tread stock for tires, is employed here as the matrix for creation of a masterbatch with oxidized MWCNT (12.3-15 wt%). These materials do not show a high level of electrical conductivity as might be expected from a percolation concept, signifying excellent tube dispersion and formation of a bound rubber layer on the discrete MWCNT [126]. 

Peddini, S.K., Bosnyak, C.P., Henderson, N.M., Ellison, C.J., Paul, D.R. Nanocomposites from styrene-butadiene rubber (SBR) and multiwall carbon nanotubes (MWCNT) part 1 morphology and rheology. Polymer 55, 258-270 (2014)... 

The viscoelastic properties of natural rubber (NR) nanocomposites filled with silica/multiwall carbon nanotube hybrid fillers have been studied by H. Ismail et al. [46]. The addition of hybrid fillers (MWCNTs-i-silica) to the NR matrix... 

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