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(a) Photograph of the test for the adhesiveness of the PTFe hydrogel. Two glass vials were glued together by the PTFe-2 (pH 2.6) hydrogel, and they could hold a 200 g weight. (b) Adhesive strength plotted as a function of PTFe hydrogels with different pH values, the tested substrates were pork skin tissue, SS, and PMMA substrates.
