File Name : fig. s1.tif

Caption : fig. s1. micromorphology of hydrogel: sem of pva-paa hydrogel with freeze-thaw method (a); sem of pani@pva-paa hydrogel (b); sem of pani@(pva-paa) hydrogel (c); elemental mapping images of cl analyzed by eds (d).

File Name : fig. s2.tif

Caption : fig. s2. mechanical properties of four types of hydrogels: paa hydrogel, pva hydrogel and pva-paa hydrogel without or with freeze-thaw treatment. tensile stress-strain curve (a); compressive stress-strain curve (b).

File Name : fig. s3.tif

Caption : fig. s3. average modulus of hydrogels at different aniline concentrations.