Swelling-Crosslinking-Driven Microstructural and Mechanical Evolution in SA/PAAS Hydrogel Fibers

Key Points

• The study aims to understand the mechanisms by which swelling and crosslinking influence the microstructural and mechanical properties of SA/PAAS hydrogel fibers.
• Created SA/PAAS composite hydrogel fibers using wet-spinning technique.
• Investigated the competition between swelling and crosslinking mechanisms.
• Analyzed the evolution of microstructure and mechanical properties throughout the process.
• Fibers underwent a three-phase evolution from a heterogeneous structure to a uniform, dense dual-network.
• Achieved maximum strength of 3.48 MPa and toughness of 1.83 MJ/m3.
• Demonstrated a notable increase in strength and toughness, along with high energy dissipation above 66%.