石墨烯改性Lyocell纱线制备及性能研究OA

To address the urgent demand for flexible conductive materials in smart wearable fabrics,by com-bining highly conductive graphene with Lyocell fibers which possess excellent mechanical properties and biocom-patibility,the graphene-modified Lyocell yarns were prepared by using impregnation,wet spinning,filtration and in-situ polymerization methods.The optimal process was selected through performance comparison,and the effects of graphene addition levels(0%,0.5%,1.0%,1.5%,2.0%)on the yarn's microstructure,electrical conductivity,mechanical properties and flexible sensing performance were systematically investigated.The per-formance regulation mechanism was revealed through various characterization methods.The results showed that the modified Lyocell yarn prepared by wet spinning method exhibited the best comprehensive performance.When the addition level was 1.5%,the yarn's volume resistivity decreased from 1.2×1012 Ω·cm to 1.8×104 Ω·cm,achieving a breakthrough in electrical conductivity.The breaking strength reached 7.76 cN/dtex,which was 20.3%higher than that of pure Lyocell yarn.The flexible sensing performance was optimal:the bending sensing response rate was 42.3%within the bending angle range of 0°～180°,and the response time was≤0.3 s and the recovery time was≤0.5 s within the tensile strain range of 0%～50%.After 500 cycles of testing,the response stability retention rate reached over 95%,demonstrating excellent flexible sensing response and repeatability.