Achieving simultaneous enhancement of strength and toughness in carbon nanotube fibers (CNTFs) remains a persistent challenge due to inefficient interfacial load transfer, low nanotube alignment, and high porosity. Herein, inspired by the hierarchical architecture and borate-mediated cross-linking of plant cell walls, we report a bioinspired interfacial bridging strategy to fabricate ultrastrong and tough CNTFs. This approach involves the sequential infusion of poly(pyridobisimidazole) (PIPD) nanofibers and chains into CNTF networks, followed by borate-induced covalent cross-linking and mechanical densification. The PIPD molecular backbone consists of alternating pyridobisimidazole and dihydroxyphenyl rings, which enable the formation of hydrogen bonding and borate-mediated covalent cross-linking network with CNTs. The resulting fibers exhibit strong intertube interactions, improved alignment, and reduced porosity. Consequently, CNTFs achieve an ultrahigh tensile strength of 8.45 ± 0.28 GPa and a high toughness of 238.42 ± 14.78 MJ·m–3, surpassing the performance of commercial high-performance fibers. Additionally, the fibers exhibit high impact resistance with a specific penetration energy of 1.26 MJ·kg–1, outperforming many state-of-the-art protective materials. Experimental characterizations combined with first-principles calculations reveal that the synergistic interplay between the highly ordered assembly and strengthened interfacial interactions enables cooperative deformation and efficient energy dissipation. This work establishes a scalable and biomimetic pathway for fabricating CNTFs with a combination of ultrahigh strength and toughness, making them promising candidates for advanced structural and protective applications.
Polysulfone (PSf) membrane is widely employed in blood purification fields, but the blood compatibility of PSf membrane is not adequate. To improve the hemocompatibility of PSf membrane, 4-(chloromethyl)benzoic acid (CMBA) and sulfonated hydroxypropyl chitosan (SHPCS) were grafted onto PSf membrane surface. In our strategy, CMBA was firstly grafted on the PSf membrane surface through the Friedel-Crafts alkylation reaction, and the product was named BAPSf membrane. Then, SHPCS was grafted onto the BAPSf membrane surface by esterification , and the product was named SHPCS-BAPSf membrane. The effects of temperature and reaction time on the productivity of BAPSf and the grafting density of carboxyl and the effects of reaction time on the grafting density of SHPCS grafted onto the BAPSf membrane surface were studied. The SHPCS-BAPSf membranes are investigated by ATR-FTIR, XPS , contact angle measurements and evaluated by blood compatibility in vitro. The results reveal that the hydrophilicity of SHPCS-BAPSf membranes were grealy improved and the evaluation of protein adsorption , hemolysis test, platelet adhesion plasma recalcification time(PRT), activated partial thromboplastin time(APTT), prothrombin time(PT) and thrombin time(TT) confirmed that the SHPCS-BAPSf membranes have remarkable blood compatibility.
危险品化学品经营许可证（带存储）