Preparation And Characterization Of Polyphenol-mediated Hydrophobic And Anti-UV Fabrics

Due to the further improvement of synthesis technology,various physical and chemical methods have been developed to prepare the hydrophobic fabrics.However,many of the methods are time-consuming,costly andunfriendly to environment,and the prepared hydrophobic fabrics tend to be poor in durability and only have single property.Therefore,a simple and low-cost approach is highly desired in the construction of the hydrophobicfabrics.In this thesis,based on the preparation principle of super-hydrophobic surface,we have prepared a series of multi-functional fabrics with hydrophobic and anti-UV properties usingthreedifferent methods.The whole paper mainly includes the following three aspects:Firstly,a highly hydrophobic anti-UV cotton fabric was fabricated via coordination assembly of tannic acid(TA)and Fe(III)followed by treatment with 1-octadecylamine(ODA).The obtained fabric shows excellent oil-water separation property and high UV protection performance(the value of UPF is higher than 50).The composition and morphology of pristine andtreatedcotton fabrics were characterized by total reflection Fourier transform infrared spectroscopy(ATR-FTIR),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and atomic force microscopy(AFM).The wettability,washability and environmental stability of pristine andtreatedcotton fabrics were studied by static water contact angle test(WCA),stability test and washing test.The changes of air permeability,feel and color of pristine andtreated silk fabrics were studied by air permeability,stiffness and color difference test.Also,to further optimize experimental conditions for the construction of hydrophobic surfaces,the concentration and ration of FeCl3 and TA on cotton fabric surfaces have been studied.Secondly,a ZnO@silk fabric composite surface was prepared through one-pot sol-gel method on a silk fabric surface.In addition,a robust superhydrophobic ZnO@fabric was further constructed by dopamine and 1-dodecanethiol modification as a versatile platform for UV shielding.The results showed ZnO particles were uniformly distributed on the fibre surface with a high coating density.In comparison with hydrophobic cotton fabric,the ZnO@silk fabric exhibited a high superhydrophobic activity(CA=152.10 o)and high UV protection performance(the value of UPF is higher than 50).The robust superhydrophobic silk fabric had high stability against repeated abrasion without an apparent reduction in contact angle.We expect that this facile process can be readily and widely adopted for the design of multifunctional fabrics for excellent anti-UV applications,launderingdurability,and superhydrophobic properties.Thirdly,a facile one-step chemical bath deposition method was developed to coat hierarchical ZnO micro/nanoparticles onto silk fabrics(ZnO@Silk).Furthermore,the superhydrophobic ZnO@Silk surfaces areconstructed by the combination of hierarchical structure creation and low surfaceenergy material modification,which allows versatility for high UV protection performance(the value of UPF is higher than 50),laundering durability,and oil/water separation.The superhydrophobic ZnO@Silk shows excellentlaundering durability against mechanical abrasion without an apparent reductionof the water contact angle.The effects of different concentrations of Zn(NO3)2 on the wetting properties and microstructure of the fabrics have been explored.The composition and morphology of pristine andtreatedsilk fabrics were characterized by total reflection Fourier transform infrared spectroscopy(ATR-FTIR),X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM).The changes of air permeability,feel and color of pristine andtreated silk fabrics were studied by air permeability,stiffness and color difference test.