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Fig. 1. (a): Molecular structures of NAGA, NASC, PNAGA and PNASC. (b): Schematic illustration of reconstruction of hydrogen bonding of amide and urea in PNASC gels when DMSO is replaced with water. (c): Tensile stress-strain curves. (d): Tensile strength, Young��s modulus and yielding strength of PNASC hydrogels with different initial monomer concentrations (n=3). (e, f, g) Photos portraying the high stiffness of the PNASC-25 hydrogels. (e): 79 g of aluminum sheets can be lifted up by a length of hydrogel line (d=0.6 mm) without stretching, and nylon cord is threaded through a hole in a piece of PNASC-25 hydrogel sheet (3 cm × 1.5 cm × 0.2 cm) and lifts a bottle of water weighing 0.9 kg without occurrence of deformation of the hydrogel hole. The hydrogel sheet (3 cm × 2.5 cm × 0.2 cm) was able to bear self-weight (f) and 70 g of aluminum sheets without collapse (g).

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Fig. 2. (a) Schematic illustration of the fabrication of P(NASC-co-HepMAm) hydrogel tubes and their application as the TIVS in vivo. (b) Sequential steps in placement of hydrogel tube for TIVS in a rabbit model: (1) The rabbit��s arteria carotis was clamped on both sides by the artery clamp; (2) Defective treatment of blood vessels located between two arterial clips; (3) One end of the trimmed hydrogel tube was inserted into the rabbit��s carotid artery (3-4 mm depth) through the defect; (4, 5) Another end of the hydrogel tube was trimmed and the rabbit carotid artery was amputated; immediately, this end of the trimmed hydrogel tube was inserted into rabbit carotid artery (3-4 mm); (6) The arterial clip was removed to restore the blood flow. (c) (1, 7), (2, 8), (3, 9), and (4, 10) are the photos of blood color change in the PNASC-25 and P(NASC-co-HepMAm)-25-15 hydrogel tubes after being implanted for 0, 1, 2, and 4 h. (5, 11) are the photos of the PNASC-25 and P(NASC-co-HepMAm)-25-15 hydrogel tubes removed from the end of arteria carotis. (6, 12) Stereomicroscopic images of the PNASC-25 and P(NASC-co-HepMAm)-25-15 hydrogel tube luminal surface.

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  Փ��朽ӣ�https://pubs.rsc.org/en/content/articlelanding/2020/mh/c9mh01844a#!divAbstract