强韧大豆蛋白导电水凝胶的制备及传感性能研究OA

Soybean protein isolates(SPI)were mixed with acrylamide(AAm),cationic cellulose nanofiber(CCNF)and lithium chloride(LiCl)to fabricate an interpenetrating network hydrogel matrix by thermal-induced radical polymerization.Then,the high toughness polyacrylamide-soybean protein isolates-cationic cellulose nanofiber(PAAm-SPI-CCNF)conductive hydrogel was prepared by impregnating the hydrogel matrix in ammonium sulfate solution.And the mechanical,anti-freezing and sensing properties of the conductive hydrogel were investigated.The synergistic effect among CCNF,SPI cluster and PAAm polymer chains endows conductive hydrogel with excellent mechanical properties.Compared with PAAm-SPI hydrogel without CCNF,under the condition of the amount of CNNF was 3 g,the elongation at break increases from 840％to 973％,tensile strength increases from 148 kPa to 370 kPa and toughness from 768 kJ/m3 to 1 869 kJ/m3 for PAAm-SPI-CNNF3 hydrogel.Additionally,this hydrogel exhibits remarkable resilience with over 65％elastic recovery under 90％compressive strain.Meanwhile,the hydrogel has exceptional anti-freezing properties,maintaining high ionic conductivity of 0.293 S/m at-30 ℃.The assembled sensor based on this hydrogel exhibited desirable strain and pressure response.The hydrogel sensor achieves gauge factor(GF)of 1.15 and 2.95 in the strain ranges of 0-100％and 100-500％,respectively.In the pressure intervals of 0-50,50-200,and 200-450 kPa,the GF was 0.975,0.087,and 0.021 kPa-i,respectively,and the hydrogel sensor still has stable sensing performance at low temperatures.