Han Xiaokun, Lu Tianyun, Wang He, Liu Guiting
The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, PR China.
Key Laboratory of Rubber-Plastics of Ministry of Education, Shandong Provincial Key Laboratory of Rubber, Plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao 266061, PR China.
Int J Biol Macromol. 2025 Apr;303:140651. doi: 10.1016/j.ijbiomac.2025.140651. Epub 2025 Feb 4.
Natural polymers play a non-negligible role in the development of green and sustainable sensors. However, their poor flame retardancy and deficient thermal stability inevitably restrict their application in sensors for monitoring the fire full-process. In this work, a facile and eco-friendly method for the large-scale preparation of flexible films composed of bamboo fiber (BF), carboxymethyl cellulose (CC), and graphene (GN) by solution casting was put forward. Iron ions and phytic acid (PA) self-assemble on its surface, eventually resulting in a film (referred to as BCGP) that exhibits high strength and high flame retardancy. Specifically, the strength of the film reaches 3.92 MPa, and reliable strength still be ensured even after long-term soaking. Furthermore, the limiting oxygen index of the film is as high as 33 %, the vertical burning test attains the V-0 level. As a sensor, the film promptly triggers an alarm within 3.6 s of contact with flames, and its response remains sensitive even after repeated scorching. The temperature response encompasses a wide range of 50 to 200 °C, and the gauge factor is as high as 1572.
天然聚合物在绿色可持续传感器的发展中发挥着不可忽视的作用。然而，它们较差的阻燃性和不足的热稳定性不可避免地限制了其在火灾全过程监测传感器中的应用。在这项工作中，提出了一种简便且环保的方法，通过溶液浇铸大规模制备由竹纤维（BF）、羧甲基纤维素（CC）和石墨烯（GN）组成的柔性薄膜。铁离子和植酸（PA）在其表面自组装，最终得到一种具有高强度和高阻燃性的薄膜（称为BCGP）。具体而言，该薄膜的强度达到3.92兆帕，即使经过长期浸泡仍能确保可靠的强度。此外，该薄膜的极限氧指数高达33%，垂直燃烧试验达到V-0级。作为传感器，该薄膜在与火焰接触3.6秒内迅速触发警报，即使经过反复灼烧其响应仍保持灵敏。温度响应范围为50至200°C，应变片系数高达1572。
