The Research Of Application Of Carbon Nanotubes Reinforced Natural Rubber Composites In The Tire And The Interface

Carbon nanotubes (CNT) have been considered as ideal reinfocing fillers, because of their excellent electrical, mechanical and the thermal properties. Due to the strong chemical inertness of CNT surface, there is no effective interaction between CNT and matrix, which limits the application of CNT. Thus, this subject was designed to strengthen the interface between CNT and matrix. We developed a new method of characterizingthe interfacialinteraction state between the filler and matrix quantitativelyby atomic force microscopy nanomechanical mapping technique. At the same time,with the development of science and technology, the enterprise can produce different kinds of tubes, so how to choose the suitable tube in order to exert the maximum potential of CNT is the focus of our search. Our main work was as follows: 1.We selected four kinds of CNT as experimental materials, and prepared CNT/NR composites by mechanical mixing method. The result showed that the addition of CNT could significantly improve the mechanical properties and thermal conductivity of the composite, the degree of Flotube7000for improving mechanical properties was the largest,the degree of Flotube7000and Flotube9011on thermal performance was the most obvious.2.We characterized the filler dispersion by AFM nanomechanical mapping technique, these images qualitatively resembled TEM images. We observed the modulus distribution around the fillers, and then researched the interface between CNT and NR with and without saline coupling agent modification by AFM nanomechanical mapping technique. As a result, we observed that the thickness of the interfacial layer between CNT and NR was9.0nm, the thickness of the interfacial layer between CNT and NR with Si69in situ modification was17.4nm. The result by AFM nanomechanical mapping showed correction with both experimental studies using Rubber Processing Analysis(RPA) and static mechanical properties.3.Although at present CNT and carbon black(CB) reinforced NR has gained widespread attention, but the dynamic performance of composites is rarely reported.We took the CNT (Flotube7000,9011)and carbon black N660as the research object, and prepared carbon nanotubes/carbon black/NR compositesfor improving thermal conductivity of composite material.The result showed that "negative synergy effect" finally, not the "superposition relationship" or even "synergistic effect".4.We found that only the CNT reinforced rubber was hard to meet the high thermal conductivity and low heat build-up in the certain condition of rubber materials. Thus we selected CNT(Flotube9011) and nano-aluminum oxide to prepare composites. The result showed that the using of CNT and aluminum oxide at the same time had"synergistic effect". The dynamic mechanical performance was excellent.