Nano-Reinforcement Of NR And Percolation Phenomena In NR With Spheroidal Inorganic Particle

Several new types of inorganic nanopaticle and reinforcing resin were used to prepare the reinforced NR, and the properties of the composites were systematicly studied in this paper. A percolation phenomenon were proposed for the mechanism of CB filler-network in NR, which was similar to the percolation behavior in rubber toughened resin. The main content is listed as follows:(1) Prepared NR/OMMT(DK4) nanocomposites via mixing. Found that the composite has a superior performance with 25 phr OMMT. The elongation at the break and the property of heat-resisting oxygen aging of the nanocomposite was much higher, but the wear strength drop compared with the NR reinforced by equal content of carbon black N330. The tensile strength and 300 % modulus of the nanocomposite were equal to that of the NR reinforced by equal content of carbon black N330.DMA result demonstrate the OMMT/NR composite has a superior dynamic heat generation than N330/NR in 60~80oC.NR/MMT composites were prepared by the reactive mixing intercalation method in the presence of CRA-138M resin, the influence of resin amount, reaction temperature and the rotational speed on the result of insertation were studied.(2) MWNTs reinforced NR as a new filler.SEM images showed poor dispersion of raw MWNTs.Resin GLR-20 and PN759 improve surface cohesiveness and mechanical properties slightly.Moreover, after MWNTs were modified via mixing functionalized MWNTs (treated by HNO3) with SA or TESPT, both the tensile strength and the wear strength of MWNTs/NR composites improved obviously, and the tensile strength would be enhanced further when used together with resin PN759.(3) Several kindes of new reinforcing resins and their synergistic effection with N330 as reinforcement agents in the composite were studied individually on the mechanical properties of NR composites, and the optimized resin content were obtained. Also studied the feasibility of replacing carbon black N234 with new carbon black CD2109 in the tread rubber formula.(4) Percolation behavior was proposed here for the reinforcing mechanism of spherical inorganic nanoparticles in NR. There were two kinds of percolation behaviors and relative models in the formation process of filler-network in NR. On one part, the formation of CB stress volume balls'network was a behavior of set-percolation, and the threshold value was 0.15. On the other part, CB– CB themselves network belonged to a behavior of bond-percolation, which was revealed in conductivity test.