Construction Of Multifunctional Textile Via In-situ Growth Metal-organic Framework Materials

Metal organic framework（MOFs）is a new type of porous crystal material composed of organic linker and metal ions,which has the characteristics of high specific surface area,large porosity and various pore size functions.It has been widely studied in the research fields of ion exchange,gas storage,adsorption and catalytic reaction.However,at present,most of MOFs need high temperature and high pressure reaction to prepare,and the prepared MOF powder is difficult to be processed into a macro form which is easy to use,which greatly limits their application.If a simple and convenient method is used to attach it to the surface of the textile,it will give the multifunction of the textile,so as to expand the scope of application of the textile.It mainly carried out the following three aspects of work:Firstly,Superhydrophobic cotton fabrics with improved ultraviolet resistance were prepared via in situ growing NH₂-MIL-125（Ti）（Ti-MOF）nanoparticles on cotton fibers and subsequently coating with polydimethylsiloxane（PDMS）under room temperature.The synergetic effect of Ti-MOFs nanoparticles and PDMS was critical and essential for obtaining a superhydrophobic coating with anti-UV property.The surface microstructure,chemical composition,and superhydrophobic property of the as-prepared fabrics were characterized by K/S value,scanning electron microscopy（SEM）,X-ray photoelectron spectroscopy（XPS）,energy dispersive spectroscopy（EDS）,and water contact angle（WCA）measurements.The as-prepared cotton fabrics not merely exhibited desirable superhydrophobic property with a water contact angle（WCA）of 154.7±0.7°and a sliding angle of 3.6°,but also displayed the considerable UV resistance.The oil–water separation,stability of UV protection and superhydrophobicity were also investigated.The superhydrophobicity,anti-ultraviolet property,and K/S value of as-prepared PDMS/Ti-MOFs@cotton fabrics were stable after 300 cycles of abrasion and 5 cycles of washing.The facile synthesis technique provided a simple method for scalable construction of multifunctional fabrics.Secondly,we report a facile fabrication of non-fluorinated superhydrophobic and antibacterial cotton fabric surfaces via in situ growing zeolitic imidazolate framework-8（ZIF-8）nanocrystals on cotton fibers under room temperature condition and subsequently coating with polydimethylsiloxane（PDMS）.The surface morphology and chemical composition of treated fabric have been characterized by X-ray photoelectron spectroscopy（XPS）,energy dispersive X-ray spectroscopy（EDS）,X-ray diffraction analysis（XRD）and scanning electron microscopy（SEM）.The as-prepared cotton fabric showed superhydrophobic property with a water contact angle（WCA）of 151.36°and a sliding angle of 3.6°and excellent antibacterial properties against E.coli and S.aureus.The durability of the superhydrophobic and antibacterial fabrics was evaluated by repeated washing and abrasion cycles.The as-prepared fabrics retained their excellent antibacterial property and superhydrophobicity after 300 cycles of abrasion and 5 cycles of washing.The robustness of superhydrophobicity and antibacterial activity made this method has wild application prospects in biomedical field in the future.Thirdly,superhydrophobic cotton fabrics with improved ultraviolet resistance were prepared via in situ growing ZIF-67 nanoparticles on cotton fibers and subsequently coating with polydimethylsiloxane（PDMS）under room temperature.The surface microstructure,chemical composition,and superhydrophobic property of the as-prepared fabrics were characterized by K/S value,scanning electron microscopy（SEM）,X-ray photoelectron spectroscopy（XPS）,energy dispersive spectroscopy（EDS）,and water contact angle（WCA）measurements.The wettability and UV resistance of the composite textiles were characterized by static water contact angle（WCA）and UV resistance tester.The effects of deposition times on the hydrophobicity and UV resistance of the fabric were discussed,and the effects of washing and friction treatment on the stability of the composite functional textiles were investigated.The results show that the static water contact angle of the composite functional textiles is 153.0±2.7°and the UV protection factor（UPF）is 31.10±0.84,showing super hydrophobicity and good UV resistance.