There is a saying that the structure may contain chemical bonds, based on the phenomenon: although the structured glue can be used after retraining, there is a certain gap between the performance and the structure. I think that after structuring, due to the huge amount of hydrogen bonds between silica and polysiloxane, and the polymer entanglement between polysiloxane, retraining requires great shear force and a certain temperature. Huge friction (local high temperature) may cause the polysiloxane chain to break and degrade, and it is not surprising that the performance changes. Although structuring is unavoidable when mixing rubber, the structuring we usually focus on refers to the phenomenon that occurs within months of storage under normal temperature and pressure and very mild conditions. From the structure of raw rubber, which group has the possibility of chemical reaction with silica under normal temperature and pressure and mild conditions? You can say that white carbon black contains chlorine and is acidic, then as long as a very small amount of amine is added, the structure should not be generated. So far, no one has obtained anti-structure by adding amines or adjusting white carbon to neutral Products, so structuring can only be the effect of a large number of hydrogen bonds.

Low-molecular-weight polysiloxane (not the hydroxyl- or alkoxy-terminated one, but methyl or vinyl that is only inert to silica). No structural phenomenon is observed, or the degree is very light. Obviously related to the entanglement of polymer chains.

Therefore, I think that the structure is firstly the effect of silica and raw rubber, and the second is the entanglement of raw polymer to strengthen this effect.