Filled NR composite

However, it was as well reported that the rebound resilience and the dynamic compression properties of the CNT/NR nanocomposites are better than that of CB-filled NR composites. 

Wirasate et al also prepared NR nanocomposites using pristine Na -MMT or OMMT as reinforcing agent by a conventional mechanical mixing method. They found that both Na -MMT and OMMT could accelerate the vulcanization reaction of NR. The abrasion resistance of NR was improved by the addition of either Na" -MMT or OMMT. OMMT-filled NR composites showed better abrasion resistance than those of Na -MMT filled NR composites. Meanwhile, they had also found that the addition of Si69 to NR resulted in improvement of the abrasion resistance of the NR/Na -MMT composites due to the reduction in Na -MMT particle size. Particle size and dispersion of OMMT remained the same by the addition of Si69, thus the abrasion resistance, abrasion pattern and mechanical properties were not affected. 

Zhang et alP prepared highly filled NR composites based on silane-modified kaolin (SMK), precipitated silica (PSi) and their mixed-compound additions (SMK + PSi) by melt blending. It was found that these highly filled NR/SMK composites exhibited outstanding mechanical properties, exeellent gas barrier properties and much higher thermal stability, compared to the pure NR. The gas barrier properties of NR composites with SMK and PSi were much higher than those of NR/PSi composites, and better than those of NR/SMK. 

Compared to the neat NR and CB/NR composites, the addition of the CNTs brought about remarkable increase in hardness, tensile modulus and tensile strength to the rubber material. The rebound resilience and dynamic compression properties of the CNT/NR nanocomposites are better than that of CB-filled NR composites, which is beneficial for the actual application such as tire, etc., under a dynamic condition. The fracture morphology of the cured CNT/ NR nanocomposites is shown in Figure 6.16. 

Figure 8.20 shows the XRD patterns for CB- and clay-filled NR composites. A broad peak is apparent for OMt-filled NR B composites. This peak disappears completely in the case of EOMt-filled NR-CB composites. Although the NR composites are filled with significant amounts of CB the absence of any peak indicates a complete exfoliation of the clay minerals when they are mixed in expanded form. Strain-induced filler-filler network breakdowns by dynamic tension mode at constant frequency and temperature was carried out and the... 

Figure 8.21 Filler-filler network (Payne effect) in hybrid filler filled NR composites.

Micro and Nano Zinc Oxide Filled NR Composites... 

In materials research, the development of rubber nanoeomposites is rapidly emerging as a multidisciplinary research activity whose results could broaden the applications of rubber to the great benefit of many different industries. This chapter covers the various parameters effeeting material properties of miero and nano-CaC03 filled NR composites and nanoeomposites. 

The effect of different preparation methods on the mechanical properties of micro/nano-Si02 filled NR composites have been studied by many workers. These findings show that the mechanical properties of Si02 nanocomposites of NR are enhanced in comparison to that prepared by traditional blending. 

The mechanical properties of the control NR composite, untreated HNT-filled NR nanocomposite, treated HNT-filled NR nanocomposite, and silica-filled NR composite are tabulated in Table 19.6. The addition of 10 phr HNT loading increased the tensile modulus and tensile strength compared to the neat NR vulcanizate. However, the values of elongation at break of the HNT filled rubber nanocomposite were decreased in comparison to the unfilled NR vulcanizate. The silica filled NR vulcanizate showed inferior properties as comparison to HNT filled nanocomposites. It is well known that the modulus of rubber vulcanizates is proportional to the degree of crosslink density. Therefore, modulus of rubber vulcanizates increased with the increased of crosslink density. In contrast, the elongation at break decreased with increasing crosslink density. 

Table 19.7 Mechanical properties of FASi/PSi-filled NR composites with different PSi weight fractions. (Reprinted from ref. 62 with permission from Elsevier .)...

Figure 21.1 Complex dynamic viscosity as a function of shear rate (100 °C, 1 Hz) for the mica-filled NR composites.

Thanunya et al reported the use of FA as filler in NR to reinforce and/or reduce product cost. In their study the viscoelastic properties of FA-filled NR composites with various FA loadings were investigated with the utilization of... 

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