Effect of Temperature and Fatigue on Gas Barrier Properties of Brominated Butyl Rubber
Butyl rubber bromide(BIIR)has become the preferred material for tire inner liner due to its excellent gas barrier properties.However,its performance and service life will be greatly affected by high temperature generated by frictional heating and fatigue effect under rolling.Therefore,it is of great significance to explore the effect of temperature and fatigue on gas barrier properties of BIIR.In this paper,the changes in the gas barrier properties of BIIR under the single-factor effects of temperature and flexural fatigue,as well as under the dual-factor effects were studied.And through analysis methods such as crosslinking density testing,dynamic mechanical analysis,and transmission electron microscopy,the changes in the molecular crosslinking network and filler distribution of BIIR under the dual-factor effects of temperature and fatigue were explored.The results show that the thermal aging increases the crosslinking density of BIIR and improves its gas barrier properties.The effect of fatigue on its gas barrier properties is also relatively small.However,under the joint action of temperature and fatigue,the crosslinking network formed by BIIR at higher temperatures is more prone to cracking under the effect of flexural fatigue,which drives the"movement"of filler particles and leads to a significant reduction in the gas barrier properties of BIIR rubber.
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