| The outbreak of COVID-19 in 2019 quickly swept the world and seriously threatened people’s lives and health.Medical protective clothing has become an indispensable item for medical staff to save patients.However,the existing protective clothing has poor ventilation and moisture permeability.Wearing protective clothing for a long time by front-line medical staff will significantly reduce human comfort,thereby reducing work efficiency,and even endangering life and safety due to overwork.Besides,it is very essential to monitor and feedback the health status of medical staff wearing protective clothing,which can effectively prevent accidents.At present,commercial protective clothing and protective masks have a single function,and poor wearing comfort,so it is impossible to monitor the physical health of the wearer in real-time.In response to the above problems,this thesis starts with the modification of medical protective clothing fabrics and the application of fabric sense.It started three parts of work:Firstly,the electrospinning nanofiber fabric with better air permeability and moisture permeability was used to replace the meltblown,and SiO2 radiative cooling particles were introduced into the nanofiber material.Secondly,the radiative cooling medical protective clothing fabric was prepared by hot-pressing with radiative cooling nanofiber film and medical nonwoven cloth,to realize the moisture and heat management of the microenvironment in the protective clothing.A force-sensitive sensing fabric based on the piezoresistive principle was developed by combining two-dimensional nanomaterial MXene with pure cotton fabric.It was applied to the wearable monitoring field to monitor the movement posture and respiratory rate of medical personnel in real-time.The main research contents of this thesis are as follows:（1）Study on SiO2/PVDF radiative cooling nanofiber membranes by electrospinning:SiO2/PVDF radiative cooling nanofiber membranes was prepared by electrospinning.The effects of SiO2 particle size,SiO2 doping amount,and PVDF concentration on the surface morphology and infrared transmittance of SiO2/PVDF nanofiber membranes were studied.The optimum process parameters were determined as follows:the concentration of PVDF in the spinning solution was15%,the particle size of SiO2 was 2μm,and the SiO2/PVDF was 0.15（mass ratio）.Under these parameters,the microstructure and infrared transmittance of the SiO2/PVDF nanofiber membranes was the optimum.（2）Preparation and application of radiative cooling medical protective clothing fabric:SiO2/PVDF nanofiber membranes and nonwoven fabric were hot-pressed to obtain the sandwich structure of radiative cooling medical protective clothing fabric（SiO2/PVDF-NWF）.The fabric has an excellent radiative cooling function.According to the radiative cooling test,the temperature difference between the upper and lower sides of the fabric is 2.5℃,which could effectively improve the wearing comfort of the protective personnel and achieve personal thermal management.Besides,blood oxygen,temperature&humidity,and positioning sensors were assembled on the protective clothing of radiative cooling fabric to build a multifunctional sensing system.（3）Application of MXene-based force-sensitive sensing fabric in protection system:By impregnation method,the two-dimensional nanomaterial MXene was compounded with pure cotton fabric to obtain conductive fabric.After the structural design,MXene-based force-sensitive sensing fabric was constructed together with nylon fabric of screen printing interdigital electrode.The sensing fabric was characterized by high sensitivity(18.023 k Pa-1),a wide detection range（20.5 Pa-17.7 k Pa）,and high stability（3000 cycles）.The sensing fabric was combined with protective clothing and mask to build an intelligent protection system,which can be used to monitor the movement posture and respiratory rate of medical staff. |
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