Phase Crosslinking Strategy to Construct Impact‐Resistant and Buffer‐Enhanced Bilayer Hydrogels with High Interfacial Adhesion

solution, exhibits a compressive modulus of 1493 ± 94 kPa at 50% strain, while the soft layer provides energy-dissipating cushioning. As a proof of concept, a helmet-like bilayer structure demonstrates simultaneous impact resistance and shock absorption. This work establishes a universal platform for constructing complex soft-hard composites through interfacial molecular entanglement and crystallization, addressing challenges in gradient-material fabrication for diverse biomechanical applications. The strategy with gravity-independent gradient control and dual-phase integration mechanism offers new avenues for designing multifunctional biomimetic materials.