The Preparation And Failure Mechanism Of Butadiene Rubber Composites

As a kind of high elastic polymer materials, rubber, which qualifies outstanding material properties, is important in national product. It commonly used to manufacture tires and other products under dynamic conditions. However, the rubber is poor in property of heat conductivity because of entropy elasticity in the polymer chain. It is easy to appear small crack on the rubber products in the process of dynamic fatigue. So the material performance and service life will bring huge losses. In this paper, with the extremely cold resistance and anti-aging performance, butadiene rubber(BR) is used for base material of experimental research. Through the carbon black, silica and blending with natural rubber compound we explore butadiene rubber production of crack and the crack mechanism; Then combination of macro and micro study methods explain the process of crack growth and sum up the new theory of rubber dynamic fatigue failure, which extends the service life of the rubber in the dynamic process.The first part of the discussion in the paper, different particle sizes of silica fillers are used to construct different filler network structures in the butadiene rubber to study the crack growth and extension of shape. The regularity of the performance of rubber particles forming strong impact are put forward. By adding silane coupling agent(Si69), the contrast test shows that further improve particles and the interaction of rubber matrix can effectively reduce the butadiene rubber crack propagation speed. Moreover, silica and silane coupling agent grafting rate, which the silane coupling agent on both ends of connection rubber molecular chain and nanoparticles respectively, was the key to control rubber crack propagation speed.In the second part of this paper, different content and same particle size of carbon black filled butadiene rubber and its performance applied to horizontal comparison. The experimental results show compete relationship between mechanical properties and carbon black content. With the increase of carbon black fillers, the reinforcement mechanics and other mechanical properties of rubber increased significantly; but too much carbon black fillers will cause micelles in rubber matrix and affect their performance. Therefore, it is particularly important to explore the suitable carbon black fillers content to reduce rubber crack propagation rate.In the last part of the paper, the natural rubber with better the compatibility to butadiene rubber, different proportion of blending are prepared to explore the rubber crack propagation. Combined with actual speed measuring results and the phase diagrams taken by scanning probe microscopy analysis shows that if the smaller blending system phase size is, the fuzzier phase boundary is, the easier to reduce the rate of crack growth. We concluded that the crack tip stress concentration easily release energy in the weak phase interface, undermining the rubber matrix structure. Finally it leads to fatigue failure of rubber products.