Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin 541004, China.
Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin 541004, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126476. doi: 10.1016/j.ijbiomac.2023.126476. Epub 2023 Aug 23.
Polyvinyl alcohol (PVA) and okra polysaccharide (OP) are biodegradable polymers with high hydrophilicity and good biocompatibility with potential for use as flexible humidity-sensitive materials. Herein, biodegradable flexible composite films (named POP films) were prepared from PVA, OP, and phytic acid using a solution-casting method based on. POP films exhibited excellent mechanical strength, flexibility, flame retardancy, water resistance, humidity response, and humidity-sensing characteristics. Notably, the POP humidity sensors exhibited a hysteresis value of 1.88 % relative humidity for the adsorption and desorption processes and good sensitivity over a wide humidity range of 35-95 %. In addition, the humidity sensor distinguished the frequency of nose breathing, and its response and recovery times were 0.9 and 1.98 s, respectively. The excellent performance of POP sensors in monitoring humidity and human respiratory rates demonstrates the sensor's potential for wearable smart devices.
聚乙烯醇（PVA）和黄蜀葵多糖（OP）是具有高亲水性和良好生物相容性的可生物降解聚合物，有望用作柔性湿度敏感材料。在此，基于溶液浇铸法，使用 PVA、OP 和植酸制备了可生物降解的柔性复合薄膜（命名为 POP 薄膜）。POP 薄膜表现出优异的机械强度、柔韧性、阻燃性、耐水性、湿度响应性和湿度传感特性。值得注意的是，POP 湿度传感器在吸附和解吸过程中的滞后值为 1.88%相对湿度，并且在 35-95%的宽湿度范围内具有良好的灵敏度。此外，湿度传感器能够区分鼻呼吸的频率，其响应和恢复时间分别为 0.9 和 1.98 秒。POP 传感器在监测湿度和人体呼吸频率方面的优异性能表明，该传感器有望用于可穿戴智能设备。
