Cui Jin-Feng, Li Fang-Yi, Li Jian-Yong, Li Jian-Feng, Zhang Chuan-Wei, Chen Shuai, Sun Xu
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University Jinan 250061 China
National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University Jinan 250061 China.
RSC Adv. 2019 Jun 3;9(30):17405-17413. doi: 10.1039/c9ra01992h. eCollection 2019 May 29.
In this study, magnesium hydroxide (MH) flame-retarded starch/plant fiber composites containing various MH contents (0%, 5%, 15%, 15%) were prepared and named as TF-MH0, TF-MH5, TF-MH10, TF-MH15. Thermal degradation, flame retardancy, mechanical and microscopic characteristics were discussed. The reduction in the maximum thermal degradation rate revealed that the addition of MH provided improvement in the thermal stability of the composite. The horizontal burning test and the limiting oxygen index analysis suggested enhancement in flame retardancy with increasing MH content. Moreover, the density of composites initially decreased and then increased as the MH content increased. The tensile strength was positively correlated with the density, whereas the cushioning performance was negatively correlated with the density. Microscopic analysis showed that there was an interfacial interaction between MH and thermoplastic starch, which not only improves the thermal stability, but also promotes bubble nucleation as a nucleating agent. The cells of TF-MH10 were uniform and dense, thus TF-MH10 had the best buffering performance. Furthermore, the cell structure of TF-MH15 was short in diameter, small in number, and large in skeleton thickness; therefore, TF-MH15 had the highest tensile strength.
在本研究中，制备了含有不同氢氧化镁（MH）含量（0%、5%、10%、15%）的氢氧化镁阻燃淀粉/植物纤维复合材料，并命名为TF-MH0、TF-MH5、TF-MH10、TF-MH15。讨论了其热降解、阻燃性、力学和微观特性。最大热降解速率的降低表明添加MH提高了复合材料的热稳定性。水平燃烧试验和极限氧指数分析表明，随着MH含量的增加，阻燃性增强。此外，复合材料的密度随着MH含量的增加先降低后升高。拉伸强度与密度呈正相关，而缓冲性能与密度呈负相关。微观分析表明，MH与热塑性淀粉之间存在界面相互作用，这不仅提高了热稳定性，还作为成核剂促进了气泡成核。TF-MH10的泡孔均匀且致密，因此TF-MH10具有最佳的缓冲性能。此外，TF-MH15的泡孔结构直径短、数量少且骨架厚度大；因此，TF-MH15具有最高的拉伸强度。
