With the rapid development of flexible electronic devices, the combination of silicone rubber and graphene has become a research hotspot. By regulating interfacial interactions and filler dispersion states, synergistic improvements in material properties can be achieved.

1. Interface Design and Enhancement Mechanism

Graphene was surface-modified using a silane coupling agent (e.g., KH-550) to form covalent bonds within the silicone rubber matrix. Transmission electron microscopy (TEM) revealed that modified graphene was uniformly dispersed in silicone rubber with an average spacing of approximately 200 nm. Dynamic mechanical analysis (DMA) showed that when the graphene content reached 3 wt%, the storage modulus of the composite increased to 1.2 GPa, a 5-fold improvement over pure silicone rubber. This enhancement is attributed to graphene’s high stiffness and efficient interfacial stress transfer.

2. Optimization of Electrical and Thermal Conductivity

A three-dimensional graphene network was constructed via freeze-drying and combined with the flexibility of silicone rubber to prepare a highly conductive and thermally conductive composite. At 8 vol% graphene content, the electrical conductivity reached 150 S/cm and the thermal conductivity 2.5 W/(m·K), representing increases of 10¹⁷ and 10 times compared to pure silicone rubber, respectively. This material demonstrated rapid response characteristics in flexible heaters, achieving a temperature of 80°C within 5 seconds.

3. Multifunctional Integration Applications

By combining piezoresistive effects with thermal responses, an intelligent skin with tactile perception and self-heating capabilities was developed. Experiments showed a 200% resistance change rate under 10% strain, while surface temperature stabilized at 45°C under 10 V voltage. This makes it suitable for wearable medical devices.


Low compression set precipitated silicone rubber