Shi Yongqian, Fu Libi, Chen Xilei, Guo Jin, Yang Fuqiang, Wang Jingui, Zheng Yuying, Hu Yuan
College of Environment and Resources, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, China.
State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China.
Nanomaterials (Basel). 2017 Sep 5;7(9):259. doi: 10.3390/nano7090259.
A series of aluminum hypophosphite (AHPi)/graphite-like carbon nitride (g-C₃N₄) (designated as CAHPi) hybrids were prepared, followed by incorporation into thermoplastic polyurethane (TPU). The introduction of CAHPi hybrids into TPU led to a marked reduction in the peak of the heat release rate (pHRR), total heat release, weight loss rate, smoke production rate and total smoke production (TSP). For instance, pHRR and TSP decreased by 40% and 50% for TPU/CAHPi20. Furthermore, the increasing fire growth index and decreasing fire performance index were obtained for TPU/CAHPi systems, suggesting reduced fire hazards. It was found that improved fire safety of TPU nanocomposites was contributed by condensed phase and gas phase mechanisms. On one hand, g-C₃N₄ accelerated the thermal decomposition of AHPi for the formation of more char layers. On the other hand, g-C₃N₄ induced AHPi to generate more free radical capture agents when exposed to flame, besides protecting AHPi against thermal oxidation.
制备了一系列次磷酸铝（AHPi）/类石墨相氮化碳（g-C₃N₄）（命名为CAHPi）杂化物，随后将其掺入热塑性聚氨酯（TPU）中。将CAHPi杂化物引入TPU导致热释放速率峰值（pHRR）、总热释放、失重率、产烟速率和总产烟量（TSP）显著降低。例如，TPU/CAHPi20的pHRR和TSP分别降低了40%和50%。此外，TPU/CAHPi体系的火灾增长指数增加，火灾性能指数降低，表明火灾危险性降低。研究发现，TPU纳米复合材料的消防安全性能提高是由凝聚相和气相机制共同作用的结果。一方面，g-C₃N₄加速了AHPi的热分解，形成了更多的炭层。另一方面，g-C₃N₄在暴露于火焰时诱导AHPi产生更多的自由基捕获剂，同时保护AHPi免受热氧化。
