基于纳米铯钨青铜制备个人热管理智能纺织品OACSTPCD

There is a wealth of natural fabrics and they have been highly sought after in the textile industry over the past thousands of years and in the pre-industrial textile trade.Among them,silk made of excellent natural mulberry is one of the dominant industries in China,and it is popular in the garment industry because of its unique properties.In recent years,the progress of technology has continuously improved living standards,and consumers'requirements for clothing have also increased.Nowadays,people not only pursue the beauty of clothing,but also have more requirements for the functionality of clothing.Therefore,the additional function of the fabric has gradually attracted attention.In recent decades,fossil fuel resources have been gradually depleted.Due to their non-renewable nature,people have conducted extensive research on sustainable green clean energy,mainly focusing on high output,efficient transportation,low energy consumption and environmental friendliness.Using new energy to develop new materials and broadening the application fields of materials can not only improve the efficiency of resource utilization,but also increase revenue and obtain new materials with high added value.In recent years,it has been found that nano-cesium tungsten bronze particles(CsxWO3NPs)are excellent photothermal nanomaterials,which have potential applications in photocatalysis,photothermal therapy and other fields.By loading nano-cesium tungsten bronze on the surface of silk,silk fabrics can achieve multiple functions.Dopamine can spontaneously polymerize under alkaline conditions and form polydopamine(PDA)by oxidative polymerization.And it can act on almost all substrates and has strong adhesion.Therefore,polydopamine is used to modify a variety of nanoparticles,and the core-shell structure formed has been widely used.Polydopamine films can also be used as an excellent secondary reaction platform,so they are widely used as a material surface modifier.In the study of surface modification,there are some common problems,such as unstable bonding,and ease to fall off during washing or repeated use when nanomaterials are modified on the surface of fabrics.To explore a green and convenient method to prepare modified silk fabrics,this study combines physical and chemical methods. A CsxWO3/PDA modified silk fabric was prepared by surface modification of natural silk fabrics with polydopamine-assisted photothermal nanomaterial cesium tungsten bronze.The effects of modification on the surface morphology,secondary structure,mechanical properties and UV-shielding capacity of silk fabrics were studied.The results of scanning electron microscopy(SEM)show that the addition of CsxWO3 and PDA makes the surface of silk fabric rough,but there are no holes or depressions.The results of mechanical properties test show that the addition of CsxWO3 and PDA does not deteriorate the mechanical properties of silk,and the breaking strength and elongation at break of modified silk are improved.Among them,the average breaking strength and breaking elongation of the modified fabric CsxWO3-Silk-PDA group increase by 67.77％and 29.92％,respectively,compared with the blank fabric,reaching(417.08±63.97)MPa and 33.56％±8.76％.Fourier transform infrared spectroscopy(FT-IR)analysis shows that the surface modification process does not destroy the secondary structure of silk,and PDA is successfully bound to the surface of silk fabric.The irradiation experiments under infrared light and natural light show that there is basically no difference in the temperature between the modified fabric and the blank silk fabric when there is no light.When the modified fabric is stimulated by light,it is heated by absorbing solar energy to"keep warm".The test results show that the maximum temperature of CsxWO3/PDA-modified silk fabric under sunlight irradiation is nearly 15 ℃ higher than that of the blank group,while it is nearly 40 ℃ higher than that of the blank group under infrared light irradiation.This shows that CsxWO3/PDA-modified silk fabric has excellent photothermal properties.On this basis,the article uses the method of water washing to study the changes in the bonding strength and photothermal properties of nanomaterials.It is found that the modified silk fabric still has excellent photothermal conversion ability after washing,which decreases slightly after washing and is basically stable after 20 washing cycles.After 30 soft washing cycles,the photothermal properties of CsxWO3/PDA-modified fabrics decrease by no more than 5％under sunlight. This work provides a method for preparing self heating functional modified silk fabrics by surface modification of silk through a one-step impregnation method,and obtains intelligent textiles with high toughness and wear resistance.This strategy of modifying natural fabrics through scalable nano-processing technology can provide ideas and reference for the design and development of smart textiles,and also has high development and utilization value in the fields of sterilization and seawater desalination.