In a typical synthesis, PPy (100 μl, 10 wt %) solution and glutaraldehyde [12.5 μl, 50 wt % in deionized (DI) water] were added to 1 ml of PVA/chitosan precursor solution. The gelation was carried out for 24 hours. The obtained gel was immersed into DI water overnight to obtain the pure hydrogel. The purified hydrogel was frozen by liquid nitrogen and then thawed in DI water at a temperature of 30°C. The freezing-thawing process was repeated 10 times. Last, the obtained hydrogel sample was fully swollen for testing.

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