Theevolutionofstructureandp Ropertiesofintegratedrubber Vulcanizatesduring Dynamicfatigueprocess

Integrate rubber is a new synthetic rubber, its research and development is order to satisfy the requirements of high-performance tires for use, and its basic performance has been systematically studied, but its dynamic fatigue performance has not been reported in detail. The subject mainly systematic studied the dynamic fatigue performance of not oil-filled integrated rubber. Studied the fatigue process of integrate rubber in which the sample changed from serviceable condition to fatigue failure until fatigue fracture and lose using value to study the dynamic fatigue performance of this new rubber systematically.The second chapter of this thesis studied the dynamic fatigue performance of integrated rubber. The results showed that integrated rubber had excellent dynamic fatigue performance and has little difference with dynamic fatigue performance of SBR. The S-N curve of SIBR showed that the unfilled SIBR has more potential defects and crack propagation rate faster while filling SIBR on the contrary.This paper studied the transition of structure and properties at different fatigue levels of unfilled SIBR, SBR and IR, the results showed that:FTIR-ATR spectra has larger changes with the ongoing dynamic fatigue, the intensity of the absorption peak at1733cm-1are significantly higher. This phenomenon is also found in the SBR and IR, but it is more obvious in the SIBR. The research of high temperature fatigue shows that cis-1,4-butadiene, cis-double bond and3,4-structural of SIBR changes.The crosslink density of SIBR, SBR and IR are significantly reduced. The thermal stability of the SIBR rubber are affected significantly, the unstable factors change. In the strain sweep mode, the E’of the SIBR and SBR are slightly lower at a smaller decline, while the E’ of the IR is increased significantly at a larger increase.The stress relaxation rate of SIBR and IR are increased after the first decreases, butthat of SBR is continuously reduced. The analysis of scanning electron microscopyshows that SIBR and SBR have no obvious micro-cracks or pores, but the IR has aclear micro-cracks.The tensile strength and elongation at break of SBR and IR aresignificantly reduced after the first increases, but SIBR are continuously reduced.This paper studied the transition of structure and properties at different fatiguelevels of filled SIBR, SBR and IR, the results showed that: The crosslink density ofSIBR and SBR are reduced after the first increases, but that of IR is continuouslyreduced. The analysis of scanning electron microscopy shows that the three filledrubber all have pores during the dynamic fatigue process and the pores areconcentrated in the latter part of the dynamic fatigue. The thermal stability of thethree filled rubber are not affected significantly, the thermal stability remainsunchanged. By DMTS we found that in temperature scan mode, the storage modulusof the high temperature zone are significantly decreased and the tanδ is increased; inthe strain sweep mode, Payne effect of three filled rubber is significantly reduced;stress relaxation rate of SIBR is increased after the first reduction, that of SBR isreduced after the increase, but IR is continuously reduced. The tensile strength andelongation at break of SIBR, SBR and IR are significantly reduced.