Fig. 4. Mechanical properties of PAAm and PU-PAAm hydrogels. (A) Tensile stress–strain curves of different PAAm and PU-PAAm hydrogels; (B) loading–unloading cycle curves of P-30; (C) loading–unloading cycle curves of PP-30; (D) tensile experiment of knotted P-30 and PP-30; (E) notch sensitivity test of P-30 and PP-30.
