Zhengzhou Rainbow Rubber Products Factory Contact: Fengjing Li phone: 15038139303 13613852984 QQ: 284163392 Address: Zhongyuan District Xisanhuan 冯湾村 six groups http://www.zzhhxjzp.com/ unsaturated rubber contains no double bonds, although it can react with the ozone reaction but slowly, not easy to produce cracking. There were many people on the unsaturated rubber ozone generation and growth of cracks done research. These researchers based on their experimental data are proposed mechanism of crack generation and growth. For example, some believe that the generation of cracks, due to breakage of the molecular chain is under stress due to the decomposition of the ozonide, the result tends to separate from each other is greater than the tendency of recombination. The crack growth in the ozone concentration and rubber molecular chain mobility related to a certain time when the ozone concentration, the greater the molecular chain movement, the faster crack growth. Some people think that the physical properties of ozone generation and growth of cracks to form ozone and rubber ozonide thin rubber physical properties as well as with the original surface layer related to the different. For example, Murray considered rubber ozonation process is a process of physical and chemical processes occur together. When the rubber in contact with ozone, the surface of the double bonds react quickly with ozone, mostly generated ozonide, so that the original supple rubber chains rapidly converted to contain a lot of stiff chain ozonide ring. When a stress is applied to the rubber, the tensile stress in the rubber chains started to make more double bonds with ozone exposure, the rubber chains contain more ozonide ring and become more brittle. Embrittlement of the surface under stress or dynamic stress is very prone to cracking.