“…V e increases in the whole aging process, indicating that the crosslinking reaction is the dominant reaction. In addition, the results of V e from DMA contain rubber–rubber, rubber–filler, and filler–filler interactions, [ 28,29 ] different from those obtained by the equilibrium swelling tests, which only reflect the interaction between rubber chains. Therefore, the curves in Figure 3F show more pronounced increments owing to the gradual migration of fillers and decrease in rubber–filler, and filler–filler interactions.…”