Biomimetic Porous Thermal Insulating Fiber And Textile

Maintaining body temperature is crucial for human health in daily life.At present,we usually regulate the temperature of room or entire building by air condition or other equipment to keep the indoor thermal comfort of human body,which causes enormous loss of energy.Therefore,people began to pay more attention to control temperature of the microenvironment around human body directly by wearable devices or clothing.In this regard,many animal hairs provide inspiration for people.Through functional study and biomimetic preparation of animal hairs,it will provide new ideas for the design and development of novel,multifunctional,high-performance porous fiber material.In extreme environments,the use of thermoregulating textile can effectively ensure that human body maintains normal temperature,thereby maintaining human health and improving labor productivity.Inspired by polar bear hair,polyimide aerogel fiber with efficient thermal insulation,tensile resistance,high temperature resistance and flame retardancy is prepared by the freeze spinning technology.High porosity,high tensile strength,and efficient thermal insulation are achieved simultaneously by constructing aligned porous structure.Through simple surface modification method,the fibers and textiles can be incorporated with other functions such as acid alkali resistance and thermoregulation.Because of the high temperature resistance and flame retardancy of polyimide,the textile woven with such porous fiber is expected to be used in special protective equipment such as firefighting clothing.In order to further research the influence of porous structure on fiber's thermal insulating property,COMSOL Multiphysics has been used to build a heat transfer model of porous fiber.The reliability of the model is validated by changing parameters for simulation,such as material thermal conductivity and fiber porosity.On this basis,starting from the structural characteristics of the biological model polar bear hair,the influence of pore diameter and core-shell structure on thermal insulating performance has been studied in order to provide theoretical basis for the optimization design and manufacture of thermal insulating fiber.