Slippery Epoxy Composites With Whisker‐Reinforced Porous Structures for Lubricant Locking

ABSTRACT Slippery liquid‐infused porous surfaces (SLIPS) typically suffer from inadequate stability due to poor matrix‐lubricant interactions. To address this limitation, we developed a novel epoxy resin/polydimethylsiloxane (EP/PDMS) composite porous membrane through a rational structural design. The system employs epoxy resin as a “hard segment” to provide strong adhesion and friction resistance, while polydimethylsiloxane serves as a “soft segment” to impart flexibility and hydrophobicity. The composite was synthesized via an epoxy‐amine addition reaction, and hydrophilic calcium sulfate whiskers (CSW) were hydrophobically modified with stearic acid (SA‐CSW) and physically incorporated into the polymer matrix. A stable porous structure was fabricated using the breath‐figure method, and after silicone oil infusion, an ultra‐smooth surface was obtained. Systematic investigation revealed that the optimal performance was achieved with 5% SA‐CSW content, an amino‐terminated polysiloxane to epoxy resin ratio of 1.5:10, and a coating concentration of 20 mg/mL, resulting in a remarkably low sliding angle (SA) of 5°. Comprehensive characterization including FTIR, XPS, TGA, and SEM confirmed the successful construction of the composite structure and its excellent stability. The developed SLIPS demonstrate outstanding comprehensive properties including superior oil retention, enhanced mechanical durability, excellent lubrication performance, and effective antibacterial capability, providing a reliable solution for stable lubricant‐infused surfaces.