摘要
The bamboo fiber functionalized with phthalic anhydride underwent carbonization,yielding bam-boo cellulose-derived carbon nanomaterials(C-BCN).These C-BCN were subsequently integrated into an acrylamide precursor solution to synthesize an ultra-robust,fatigue-resistant conductive hydrogel(PAM-C-BCN).During in situ polymerization,the abundant active sites on the C-BCN surface facilitated covalent cross-linking with the polyacrylamide(PAM)matrix.This interfacial interaction promoted strong adhesion between the PAM chains and the carbon nanostructures,forming a densely interpenetrated network through macromolecular entanglement.The synergis-tic coupling of the rigid C-BCN framework with the flexible polymer chains conferred exceptional mechanical resilience and energy dissipation capabilities to the composite hydrogel.Compared to the PAM hydrogel,the PAM-C-BCN hydrogel exhibited an improvement in mechanical prop-erties,with a fracture strength of 363 kPa(a 2.5%increase),an elongation of approximately 2254%(a 2.0%increase),a fracture energy of 30 kJ/m^(2)(a 3.1%increase),and a toughness of 3.04 MJ/m^(3)(a 4.1%increase).Moreover,PAM-C-BCN hydrogel demonstrated high adhesion(up to 7.5 kPa on pigskin)and conductivity(0.21 S/m).This strategy required neither complex design nor processing,offering a simple and efficient approach with great potential for hydrogel appli-cations requiring high mechanical performance.At the crack tip of PAM-C-BCN hydrogel,C-BCN exhibited superior crack propagation resistance compared to SiO2 nanoparticles.Importantly,this strategy offered valuable insights for developing tough and stretchable hydrogels.
基金
supported by Applied Basic Research Program of Yunnan Province(No.202301AS070041)
National Natural Science Foundation of China(No.32171884)
the Major Science and Technology Project of Yunnan Province(202402AE090027)
Long Yang acknowledges Candidates of the Young and Middle-Aged Academic Leaders of Yunnan Province(No.202105AC160048)
the Ten Thousand Talent Program for Young Topnotch Talents of Yunnan Province(No.YNWR-QNBJ-2020-136)
Guanben Du acknowledges the Yunnan Provincial Academician Workstation(No.YSZJGZZ-2020052)
the 111 Project(No.D21027)
supported by the Scientific Research Fund project of Education Department of Yunnan Province(No.2025J0626).
