| Summary: | The influence of the molecular structure of monophenyl and diphenyl silicone rubber on the high temperature resistance was studied by combining experiment and molecular simulation. The results showed that hardness, mechanical properties and high temperature resistance of the diphenyl silicone rubber system were not significantly different from those of the monophenyl silicone rubber system at the early aging stage of high temperature of 400 ℃, but after 10 aging cycles of high temperature of 400℃, mechanical properties and mass retention rate of the diphenyl silicone rubber system were higher, and high temperature resistance was better. In addition, the results of molecular simulation confirmed that Si—O of diphenyl silicone rubber has higher dissociation energy at 675 K, and the diphenyl silicone rubber system has stronger steric effect, smaller free volume fraction, lower probability of contact with oxygen, and higher thermal stability in long-term high temperature environment.
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