Structure and performance preparation on alginate-based fibrous aerogel with double network

Abstract

To sodium alginate and acrylamide (AM) as raw material, using ammonium persulfate (APS) as initiator, N,N-methylene bisacrylamide (MBA) as crosslinking agent, SA/PAM-based fibrous aerogels are prepared by extrusion and freeze drying techniques based on dual network structure design. The results show that the best preparation process is one step molding, acrylamide 50 wt%, 1.2 mm spinneret pore size, 9 mm/min spinning rate, 3 wt% CaCl2 coagulation bath, 5 min coagulation time. The aerogels present a microscopic multi-layered pore structure with macroporous intervening mesopores and micropores, and rendered as macroscopic fibrous. The average pore size of macropores is 2093.70 nm, the specific surface area is 230.00 m2/g, the porosity is 72.10%. The average pore size of mesopores and micropores is 40.44 nm, the specific surface area is 18 m2/g and the thermal conductivity of fiber aerogels/epoxy composites is 0.1321 w/m·k.