The Structure Design,Preparation,and Performance Study Of Flexible Mechanical/Thermal Management Devices

With the development of society and science and technology,people have more diversified requirements for wearable clothing,and functions such as comfort,health monitoring and intelligence have become people’s new demands.The single function of traditional wearable devices is difficult to provide more comfortable guarantee for human body in complex scenes.Based on this,the research of new wearable devices with flexible,intelligent and thermal comfort performance is of great significance.Thesis,a multifunctional integrated device is designed and fabricated,which has the performance of human body sensitive monitoring and thermal management.Flexible forces-sensitive/thermal management integrated devices have the advantages of flexible,energy-saving temperature control,intelligent monitoring and so on.They can provide new solutions in health care,sports protection,military support and other fields,and have a wide application prospect.Thesis,the design,preparation and performance of integrated devices are studied.The main contents are as follows:（1）Research on flexible pressure sensing/Personal thermal management integrated Device based on fabric Substrate.In the field of force sensitivity research,the effects of different braided structures and different braided densities on the force sensitivity of multifunctional integrated devices were investigated.COMSOL finite element simulation software was used to analyze the stress of fabric models with different structures and braided densities.The simulation results are verified by high temperature carbonization method and carbon black impregnation method,and the conclusion is consistent with the simulation results.The sensitivity of carbonized fabric based multifunctional devices is higher(6.667×10~3 kpa^-1 at 0-20 k Pa,5.181×10~2 kpa^-1 at 20-100 k Pa).In terms of thermal management performance,the average reflectance of the visible band of the multi-functional integrated device is over 85%,and the infrared emissivity is over 90%,which can effectively emit the infrared thermal radiation of human body and avoid the solar radiation of the visible band,and has excellent radiation cooling capability.The wearable application test of the multi-functional device of force sensitive/thermal management was carried out.The combination of the device and mask proved that the device could achieve the dual performance of respiratory rate detection and radiation refrigeration,demonstrating the important application value of the device.（2）Research on flexible pressure sensing/personal thermal management integrated device based on electrostatic spinning fiber.Polyacrylonitrile-zinc oxide electrospinning films with different nano zinc oxide content were prepared by electrospinning process.The reflectance of the film is about 60%-80%in the 300-1000 nm band,and the transmittance exceeds 80%in the 8-14μm band.The cooling effect of the film has been verified in outdoor environment.The carbon nanofiber flexible pressure sensing/personal thermal management integrated device was prepared,and its sensing performance and temperature control performance were tested.The sensitivity response was 5.705×10~5k Pa^-1 at 0-30 k Pa^-1.The average reflectance of visible band is more than 85%,and the infrared emissivity is close to 90%.