Zn2+-DTPMPA chelated cellulose nanocrystal hybrid: synergistic flame-retardant, antibacterial and mechanical reinforcement mechanisms for PA66 composites

作者：Gang Long, Xue Ma, Hou–Yong Yu, Meijin Jin, Xuefei Chen, Xiaohua Wang, Zengwen Yao, Dengteng Ge, Cheng Zeng, Shengjian Wang, Haojie Zang, Yi Jiang · 发表于：Carbohydrate Polymers · 年份：2025 · DOI：10.1016/j.carbpol.2025.124691 · 被引用次数：5 · 研究领域：Flame retardant materials and properties、Advanced Cellulose Research Studies、Natural Fiber Reinforced Composites

The inherent flammability, lack of antibacterial function, and “performance-sustainability trade-off” caused by traditional additives of polyamide 66 (PA66) severely restrict its application in safety-critical fields like aerospace and medical devices. Thus, this study prepared a green bio-nanohybrid (DCZ) by constructing interfacial chelation between Zn 2+ and diethylene triamine penta(methylene phosphonic acid) (DTPMPA) on the surface of cellulose nanocrystals (CNC). When compounded with PA66, DCZ exhibits excellent properties: limiting oxygen index (LOI) reaches 31.3 %, peak heat release rate (pHRR) decreases by 65.3 %, total heat release (THR) decreases by 26.8 %, and no melt dripping as well as good antibacterial performance. Notably, the chelation-induced cross-linked interphase also improves the material's tensile strength by 61.9 %. After 30 days of UV irradiation or immersion in pH 3–11 solutions, the LOI loss remains less than 4 %, breaking the bottleneck of poor weather resistance of traditional flame-retardant PA66 under harsh environments. This strategy upgrades PA66 into a multifunctional “safety material” platform, which can be processed into films, fibers and complex profiles. It provides a green and feasible technical path for the development of high-end safety materials for aerospace interiors, medical devices and other fields.