Functional Polyester Fabrics Based On The Chelation Between Tannin And Metal Ions

Tannin?tannic acid,TA?is a kind of water-soluble polyhydroxy substance widely distributed in plants,which has strong chelating effect to metal ions.In this thesis,taking advantage of the chelation between the tannic acid?TA?and different metal ions,two kinds of functional polyester fabrics were fabricated successfully.?1?Long-lasting antibacterial fabric containing silver ions.By the chelation between TA with silver ions.Ordinary silver-based antibacterial fabrics contain the silver nano-particles?Ag NPs?;however,the durability of such fabrics is poor.After washing,the content of Ag NPs decreases and the antibacterial property decreases sharply.Herein,to address this problem,we have fabricated an antibacterial fabric based on the strong chelation between TA and silver ions from AgNO₃ via layer-by-layer self-assembly method.The so-obtained sample was abbreviated as?TA/Ag?n,in which n was the cycles of deposition of TA and silver ions.The surface morphology and composition of the fabrics were characterized by field emission scanning electron microscopy?FE-SEM?and X-ray photoelectron spectroscopy?XPS?.According to the standard of"AATCC-61:2007 accelerated washing color fastness"under the condition of 1A,the fabrics were accelerated laundered.The anti-bacterial properties were tested according to the standard of"GB/T 20944.3-2008 anti-bacterial evaluation Part 3Oscillation method".The results showed that the inhibition rate of the?TA/Ag?5 sample to staphylococcus aureus,escherichia coli and candida albicans was all over 99.9%before washing,and was still over 99%after 30 cycles of accelerated laundering cycles,which were equivalent to 150 cycles s of household or commercial washing.?2?Janus wetting fabric.The regulation of surface wettability of fabrics is very important for the development of high-value and multi-functional products.Herein,we have fabricated the Janus wetting fabric with one side superhydrophobic?contact angle was 158.4±5.2°and sliding angle was 5.4±0.4°?and the other side superhydrophilic?water absorption time 1.8±0.3s?via the controlled deposition of 1-dodecanethiol?DT?on the surface of polyethylene terephthalate?PET?fabric pre-deposited by copper.The stability of Janus wetting fabrics exposed to air and water under ultrasonicaion was studied.The results showed that,after 30 minutes of water ultrasonication?40KHz,100W?,the hydrophobic surface of Janus fabric still possessed excellent hydrophobic properties?147.6±1.2°,the sliding angle was 8.2±2.3°?and the water absorption time of the hydrophilic surface increased slightly to 5.3±1.2 s.After exposure to ambient atmosphere?temperature was 10-30?,relative humidity was 50-60%?for one year,the contact angle/sliding angle of the hydrophobic surface changed to 143.5±3.8°/16±2.5°.The water absorption time of hydrophilic surface prolonged to 15.4±2.4 s.In particular,it should be pointed out that compared with general methods,the reported methods for functional fabrics in this thesis have the characteristics of time-saving,high efficiency,and low cost.The so-obtained fabrics possess good stability.This is mainly attributed to the following two aspects.On the one hand,the strong chelation between TA with metal ions enables the silver ions or the so-reduced copper particles be anchored firmly to the surface of the fabric.Thus,the binding strength of the Ag⁺ions or Cu particles is improved.On the other hand,the thiol group of DT molecules can form a strong coordination bond with copper,which makes DT molecules bond firmly to copper on the PET fabric.