“…In most cases, side chain oxidation and thermal decomposition are the main reactions of thermal aging, which can also lead to the main chain breakage of silicone rubber. [4][5][6][7] When the main chain is broken, new small silane molecules will be produced inside the silicone rubber material. In addition, high temperature easily leads to the increase of cross-linking density and the decrease of flexibility of cross-linking links, which makes the main chain of polymer not arranged in an orderly manner, resulting in a small number of crosslinking links withstanding external forces, 8,9 thus making the material hard, brittle, inelastic, tensile strength, and tear strength reduced.…”