School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China; Key Laboratory of Advanced Textile Composite, Ministry of Education, Tiangong University, Tianjin 300387, China.
Int J Biol Macromol. 2024 Feb;259(Pt 1):129252. doi: 10.1016/j.ijbiomac.2024.129252. Epub 2024 Jan 8.
Inspired by mussel adhesion and intrinsic flame retardant alginate fibers, a biomass flame retardant (PPCA) containing adhesive catechol and sodium carboxylate structure (-COONa) based on biomass amino acids and protocatechualdehyde was designed to prepare flame retardant Lyocell fibers (Lyocell@PPCA@Na). Furthermore, through the substitution and chelation of metal ions by PPCA in the cellulose molecular chain, flame retardant Lyocell fibers chelating copper and iron ions (Lyocell@PPCA@Cu, Lyocell@PPCA@Fe) were prepared. Compared with the original sample, the peak heat release rate (PHRR) and total heat release (THR) for modified Lyocell fibers were significantly reduced. In addition, the modified sample exhibited a certain flame retardant durability. TG-FTIR analysis showed that the release of flammable gaseous substances was inhibited. The introduction of Schiff bases and aromatic structures in PPCA, as well as the decomposition of carboxylic metal salts were beneficial for the formation of char residue containing metal carbonates and metal oxides to play the condensed phase flame retardant effect. This work develops a new idea for the preparation of eco-friendly flame retardant Lyocell fibers without the traditional flame retardant elements such as P, Cl, and Br.
受贻贝黏附性和天然阻燃海藻酸钠纤维的启发，设计了一种生物质阻燃剂（PPCA），它含有基于生物质氨基酸和原儿茶醛的黏附性邻苯二酚和羧酸钠结构（-COONa）。为了制备阻燃性 Lyocell 纤维（Lyocell@PPCA@Na），进一步通过 PPCA 在纤维素分子链中的取代和螯合金属离子。通过 PPCA 在纤维素分子链中的取代和螯合金属离子，制备了螯合铜和铁离子的阻燃性 Lyocell 纤维（Lyocell@PPCA@Cu，Lyocell@PPCA@Fe）。与原始样品相比，改性 Lyocell 纤维的峰值放热率（PHRR）和总热释放（THR）显著降低。此外，改性样品表现出一定的阻燃耐久性。TG-FTIR 分析表明，可燃气体物质的释放受到抑制。PPCA 中席夫碱和芳构结构的引入以及羧酸金属盐的分解有利于形成含有金属碳酸盐和金属氧化物的炭残渣，从而发挥凝聚相阻燃作用。这项工作为制备无传统阻燃元素（如 P、Cl 和 Br）的环保型阻燃 Lyocell 纤维提供了新的思路。
