| As a country with prosperous textile industry,China’s environmental pollution caused by traditional textile dyeing and finishing processes cannot be underestimated,it’s urgent to find a way to obtain colors in an environmentally friendly way.In recent years,with the development of research,environmentally friendly structural color has been paid more and more attention in the textile field.Structural coloration is the production of color by micro-nano structures which are interacted with light.It has attracted great attention worldwide and becomes a promising candidate technique for textile dyeing owing to its high brightness,fadeless,and pollution-free characteristics.However,most of the currently prepared structural color fibers have some disadvantages,such as complex preparation processes,high cost,poor mechanical properties of the fibers,and insufficient practicality of the fibers.In this study,a core-shell coaxial amorphous structural color fiber was prepared by microfluidic technology,and the purpose of this study is to obtain a structural color fiber with good performance.The main research results and contents are as follows.1.The microfluidic technology was successfully used to prepare the amorphous photonic fiber with core-shell coaxial structure.The core layer of the fiber is formed by polystyrene(PS)nanoparticles which could produce structural color,and a small amount of carbon black.The skin layer is calcium alginate fiber obtained through a cross-linking reaction of sodium alginate and calcium chloride.The skin layer not only provides mechanical properties for the fibers,but also wraps the core layer to ensure that the arrangement of nanoparticles in the core layer is not damaged when in use.More importantly,the calcium alginate skin layer is a transparent layer,so as to ensure that the structural color in core layer can be displayed.2.Structural color fibers with different saturation were obtained by changing the content of carbon black nanoparticles added in the core layer.The color saturation of the fiber was investigated in the range of 0-2%of the proportion of carbon black in PS nanoparticles.When the core layer is free of carbon black,the color of fiber is the same as the color of PS nanoparticles aqueous dispersion,which is nearly white.As the content of carbon black increases,the color saturation of fiber gradually increases.But it is not that the more the carbon black content,the higher the fiber color saturation.On the contrary,more carbon black will cause the fiber color to be darker and affect the saturation of fiber structure color.3.By changing the size of the core PS nanoparticles,fibers with different colors were obtained.Twelve sizes of PS nanoparticles between 150 nm and 295 nm were synthesized by emulsion polymerization method.Then,structural color fibers with twelve colors were obtained by microfluidic spinning method.The color are navy blue,blue,cyan,navy green,green,yellow-green,pink,pink-purple,purple,navy purple,navy blue-purple,blue-purple.These colors cover the entire visible spectrum,and it was found by experiments that the fiber color has a red shift as the size of nanoparticles increases.4.In the process of prepare structural color fibers,an aqueous solution of sodium alginate with a concentration of 3%was used as the external phase spinning solution,an aqueous dispersion of PS microspheres with a concentration of 10%and a small amount of carbon black as the internal phase spinning solution.And the calcium chloride solution with a concentration of 4%serves as a coagulation bath.In the microfluidic device,the external phase pore size is 600 μm,the internal phase pore size is 120 μm,and the spinning speed is 4 mL/h for the external phase and 1 mL/h for the internal phase.Under such spinning parameters,the structural color fibers with good color properties and mechanical properties can be prepared.The breaking strength of the fiber is about 8 MPa,which can be embroidered on the fabric as thread. |
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