Although SPM exhibits excellent permeability, its adsorption capacity is lower than that of conventional packed adsorbents such as C18 particles. To overcome this limitation, functional polymer particles were hybridized onto the pore surface of the EVA-based spongy monolith, enabling both rapid flow-through performance and enhanced adsorption functionality.

The hybrid materials were fabricated by thermal blending and extrusion molding of EVA resin with porous polymer particles. SEM observations demonstrated that methacrylate-based particles were effectively immobilized on the pore surface and remained stable even after ultrasonic washing.

By introducing ion-exchange functional particles containing MAA, 4VP, or SSA, the hybrid SPM successfully acquired ion-exchange capability. HPLC evaluations revealed stable retention behavior even under high flow-rate conditions up to 3 mL/min, demonstrating suitability for high-throughput separations.

These results indicate that hybridization significantly expands the functionality of SPM from a highly permeable material to an advanced functional separation medium applicable to rapid purification and environmental sample pretreatment.