In the manufacturing of precision composite materials, interfacial delamination between phenyl silicone rubber and metal substrates has long remained a critical bottleneck affecting product reliability. Conventional silicone rubbers, characterized by excessive molecular chain flexibility and a polarity mismatch with metal surfaces, exhibit low bonding strength and are prone to delamination under stress impact. Phenyl raw rubber—distinguished by its unique "molecular structural compatibility" and "interfacial reactivity"—acts as a "molecular-level bonding bridge" between metals and silicone rubber, achieving a transformative leap from mere "physical adsorption" to true "chemical bonding" at the microscopic level.

The key to phenyl raw rubber's ability to enhance peel strength lies in the "interfacial anchoring effect of its phenyl groups." Metal surfaces possess an abundance of active hydroxyl groups; the phenyl groups introduced into the molecular chains of phenyl raw rubber not only augment the chains' rigidity and polarity but—more critically—allow their benzene ring structures to engage in π-electron cloud interactions with active sites on the metal surface, thereby forming potent "molecular anchor points." This anchoring effect acts akin to equipping the silicone rubber molecular chains with "grappling hooks," enabling them to deeply penetrate the microscopic crevices of the metal surface. Upon curing, this process establishes an interlocking structure that boosts peel strength by more than threefold.

Furthermore, phenyl raw rubber's exceptional "thermal expansion coefficient matching" ensures that it maintains a synchronized thermal deformation trajectory with the metal substrate throughout the vulcanization temperature range. During the cooling phase, it prevents interfacial debonding caused by shrinkage stresses, thereby averting "edge warping" and "bubble defects" typically resulting from thermal mismatches. Additionally, the active vinyl groups embedded within its molecular chains can undergo co-crosslinking reactions with metal surface treatment agents (such as silane coupling agents), constructing a three-dimensional network structure—"Metal–Coupling Agent–Phenyl Raw Rubber"—that further reinforces the chemical bonding strength at the interface.

Ranging from molecular-level π-electron cloud interactions to the formation of macroscopic interlocking structures, phenyl raw rubber resolves the persistent challenge of bonding silicone rubber to metals through a synergistic mechanism characterized by a "balance of rigidity and flexibility combined with chemical anchoring." It is not only a key material for enhancing the reliability of composite materials, but also an invisible bond enabling the lightweighting and integrated manufacturing of high-end equipment.