In this study,the thermal aging test was combined with molecular dynamics simulation to explore the influence of the structure of polydimethyl-methylphenyl-polyphenyl-semisiloxane rubber chain on the high temperature resistance.The molecular dynamics simulation results confirmed that D0.3DPh0.6TPh0.1 system exhibits the highestr steric hindrance effect,and shows the higher dissociation energy,the lower free volume fraction and the more excellent thermal stability at 675 K(D is the dimethylsiloxane chain link(Me2SiO),DPh is the methylbenzosiloxane chain link(Me(Ph)SiO)and TPh is the phenylxisiloxane chain link(PhSiO1.5).x,y and z are the mole fraction of each chain segment in the block copolymerization silicone rubber,respectively).The results of 675 K high temperature aging test showed that the D0.3DPh0.6TPh0.1 system is the most stable,and the quality retention,mechanical properties and rubber elasticity are better.The results of this study provide a certain reference for the development of new high temperature resistant silicone rubber.
关键词
苯梯嵌段硅氧烷橡胶/分子模拟/耐高温性能/力学性能
Key words
phenyl ladder block silicone rubber/molecular simulation/high temperature resistance/mechanical property
维普
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