Study On The Preparation,Structure And Properties Of Graphene Functional Finished Silk Fabrics

In this paper,two creative methods were used to finish functional finishing agent graphene onto silk fabric,in order to develop an environmentally-friendly and industrialized modified method to enduring silk fabric with flame retardancy,conductivity and UV-resistance property,and flame retardant properties of modified silk fabric were mainly studied.Graphene oxide(GO)hydrosol was successfully synthesized through improved Hummers' method.The surface morphology and structure of GO were evaluated by atomic force microscope,X-ray diffraction(XRD)and Raman spectrometry.Furthermore,the viscosity test showed that the GO hydrosol not only had good water solubility,but also had high viscosity,and it can be used as a kind of coating finishing agent.GO dispersions were prepared from the obtained GO hydrosol.Silk fabrics were dipped in GO dispersions,and simple variable method was introduced in the experiments to find optimized effect factors in the dyeing process through evaluating the K/S value and whiteness index of modified silk fabrics.Subsequently,GO-dyed silk fabrics were immersed in L-ascorbic acid aqueous solution.In order to deposit more amount of reduced GO(r GO)on silk fabric surface for obtaining better properties,this dyeing-reduction cycle was repeated 1,3,5,7,9 times,respectively.Surface morphology and structure of the r GO-dyed silk fabric were characterized by scanning electron microscopy(SEM),XRD and Raman spectrometry.Tests of flame retardancy indicated that the flame retardant properties of modified silk fabric after 9 times dyeing-reduction treatment had a significant improvement in comparison with the pristine silk fabric,it had a LOI of 27.6%,and its residual weight after thermogravimetric test was still 38%.In addition,surface resistance of modified silk fabric can be decreased to 8 K?/sq.More than that,the UPF value of modified silk fabric can be increased to 55.19,which can be considered as anti-ultraviolet textile product.Based on the above two chapters,large-scale and multifunctional silk fabrics were prepared by depositing GO hydrosol onto silk fabrics via an environmentally-friendly “dry-coating” method through coating machine,and subsequently reduced in L-ascorbic acid aqueous solution.Through this modification method,the amount of reduced GO deposited on silk fabric can be easily controlled and calculated,and up to 19.5 wt% r GO could be deposited on silk fabric surface relative to the fabric weight.The morphology and structure of prepared r GO-coated silk fabric were characterized by SEM,XRD and Raman spectrometry.In comparison with pristine silk fabric,the modified silk fabric exhibited improved fire resistance and smoke suppression properties.The sheet resistance of r GO-coated silk fabric decreased to 0.13 k?/sq,and the UPF of r GO-coated silk fabric reached 500.Washing durability test indicated that the r GO-coated silk fabrics had good durability for common use.The functional silk fabric deposited with 19.5 wt% r GO was designed into a fire-resistant conductor that kept conducting even after 60 s of combustion.The silk fabric deposited with 3.9 wt% r GO was also successfully assembled into a wearable human motion signal sensor.