Mild In Situ Growth\nStrategy for Constructing High-Strength\nZr-MOFs/PVDF Fabrics and Efficient Degradation of Chemical Warfare\nAgent Simulants

Zirconium-based metal organic frameworks (Zr-MOFs) exhibit\nrich\nporosity and superior catalytic activity, endowing them significant\npotential in the application of catalytic detoxification. Self-cleaning\ntextiles developed by integrating Zr-MOFs into fibrous carriers represent\nan ideal form of protective material against chemical warfare agents\n(CWAs). Nanofibers have been extensively explored as substrates for\nflexible Zr-MOF textiles owing to their high specific surface areas\nand porosities. However, achieving a uniform and robust loading of\nZr-MOFs onto nanofibers while maintaining their excellent mechanical\nproperties remains challenging. In this study, we propose a methodology\nfor preparing high-strength polyvinylidene fluoride (PVDF) nanofiber/Zr-MOFs\nflexible textiles. We introduce a mild in situ growth strategy that\nincorporates trisubstituted triazine (TTMA) as a cross-linking agent,\nsuccessfully enabling the uniform growth of UiO-66-NH<sub>2</sub> on\nPVDF nanofiber surfaces at 60 °C and ambient pressure. TTMA exhibited\nexcellent dual-functional characteristics, promoting fiber cross-linking\nto enhance the mechanical strength of PVDF, while its abundant carbonyl\ngroups served as active sites to induce rapid growth and secure attachment\nof UiO-66-NH<sub>2</sub>. The resulting UiO-66-NH<sub>2</sub>@PTH\n(nanofibers grew membranes with different TTMA contents) composite\nmembranes exhibited outstanding flexibility and mechanical properties,\nwith tensile strengths reaching up to 18.87 MPa. The uniformly and\ntightly loaded UiO-66-NH<sub>2</sub> particles conferred exceptional\ncatalytic degradation performance against CWA simulants, achieving\ndegradation efficiencies of 99.15 and 99.24% for the CWA simulants\n2-chloroethyl ethyl sulfide and dimethyl 4-nitrophenyl phosphate,\nrespectively, with excellent stability and durability. Additionally,\nthe UiO-66-NH<sub>2</sub>@PTH displays superior moisture vapor permeability,\nwith a moisture vapor transmission rate of 5179.3 g/m<sup>2</sup>·24\nh, ensuring a balance between protection and comfort. This simple\nand feasible strategy may also be applicable to other nanofiber/MOF\ncombinations, offering insights and methods for developing high-performance\nprotective materials against CWAs.