| Over the past few years,numerous intelligent textile fibers have been created to address the challenges posed by complex climate change,with phase change fibers and heat insulation fibers being the focus of the majority of research in this area.The primary focus of this paper is to explore how coaxial wet spinning technology can be applied to produce fiber materials that regulate temperature and offer thermal management capabilities.The temperature regulating fiber in this paper primarily uses thermoplastic polyurethane（TPU）as its base material.Two types of TPU fibers were created for this study:one being a PW/TPU phase change fiber that utilizes paraffin（PW）emulsion as energy storage material,while the other is a TPU thermal insulation fiber.The study examined the morphological features,mechanical properties,heat storage,and heat insulation characteristics of the fibers.The specific results of the research are as follows:1)PW/TPU phase change fiber with"core shell"structure was prepared by coaxial wet spinning,which can realize effective encapsulation of PW.In addition,the tensile test of different phase change fibers showed that the elastic modulus of the fibers increased continuously after alcohol washing and heat treatment.The compositions of the samples were characterized by XRD.The results show that the PCM fibers are composed of PW and TPU,and no other components were produced.2)The thermal energy storage capacity of the samples was characterized by DSC.The results showed that the relative enthalpy efficiency of the PCM fibers at different extrusion rates was more than 97%,and the maximum latent heat was 117.0 J/g.The infrared camera was used to record the temperature changes on the surface of the phase-change fiber.It was found that the duration of the phase change extended with the increase of the extrusion rate ratio up to 66.8 s,and the duration of the phase change was basically unchanged after several cycles.By measuring the water contact Angle of the fiber surface,it can be seen that the hydrophobicity of the phase change fiber after heat treatment increases.Moreover,the mass loss rate of the phase change fabric was still very low（1.6%）after high temperature washing.3)By modifying the surface of the phase change fabric with carbon nanotubes,the phase change fabric with high thermal conductivity and electrical conductivity was obtained.In the test,the efficiency of photothermal conversion is as high as 95.1%and that of electrothermal conversion is 73.2%.4)The phase change fiber with uniformly fractured core material is used to test its tensile elasticity.It can be seen that the single fiber shows a complete closure curve under different strain conditions and after many stretching cycles.In addition,after the fiber is woven into fabric,it is stretched by 30%at room temperature of 25℃,and certain deformation is generated during the shrinkage process.When stretched and shrunk at high temperature of more than 50℃,the fabric morphology remains unchanged,and the surface temperature is not affected by stretching.5)In this paper,different structures of TPU thermal insulation fibers were prepared by coaxial wet spinning,and their thermal insulation properties were analyzed.It was found that their thermal insulation properties were closely related to their structures.The thermal conductivity of completely hollow H-TPU fiber is more than 0.4 W·m-1·K-1,while the thermal conductivity of hollow porous TPU fiber can be effectively reduced to 0.1957W·m-1·K-1.Low thermal conductivity TPU fabric can achieve thermal insulation in hot and cold environments.Compared with cotton fabrics,TPU fabrics greatly hinder the loss of body heat.In addition,the hollow porous structure also gives it good tensile properties,it is still intact under 200%tensile strain,the maximum tensile strength is 0.95 MPa.Figure[49]Table[11]Reference[109]... |
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