Abstract：
Enhancing the flame retardancy and durability of cellulose fibers, particularly environmentally friendly regenerated cellulose fibers types like Lyocell fibers, is essential for advancing their broader application. This study introduced a novel approach to address this challenge. Cationic-modified Lyocell fibers (Lyocell@CAT) were prepared by introducing quaternary ammonium structures into the molecular chain of Lyocell fibers. Simultaneously, a flame retardant, APA, containing -COO-NH4+ and -P=O(O-NH4+)2 groups was synthesized. APA was then covalently bonded to Lyocell@CAT to prepare Lyocell@CAT@APA. Even after undergoing 30 laundering cycles (LCs), Lyocell@CAT@APA maintained a LOI value of 37.2 %, exhibiting outstanding flame retardant durability. The quaternary ammonium structure within Lyocell@CAT@APA formed asymmetric ionic bonds with the phosphate and carboxylate groups in APA, effectively shielding the binding of Na+ ions with phosphate groups during laundering, thereby enhancing the durability. Additionally, the consumption of Na+ ions by carboxylate groups further prevented their binding to phosphate groups, which contributed to enhance the durability properties. Flame retardant mechanism analysis revealed that both gas and condensed phase synergistically endowed excellent flame retardancy to Lyocell fibers. Overall, this innovative strategy presented a promising prospect for developing bio-safe, durable, and flame retardant cellulose textiles.
摘要：
增强纤维素纤维的阻燃性和耐久性，特别是环保的再生纤维素纤维类型，如Lyocell纤维，对于推进其更广泛的应用至关重要。这项研究引入了一种新的方法来应对这一挑战。通过将季铵结构引入Lyocell纤维的分子链中，制备了阳离子改性的Lyocell纤维（Lyocell@CAT）。同时,阻燃剂，APA,合成了含有-COO-NH4+和-P=O(O-NH4+)2基团。然后将APA共价键合至Lyocell@CAT以制备Lyocell@CAT@APA。即使在经历了30个洗涤周期(LC)之后，Lyocell@CAT@APA保持了37.2%的LOI值，表现出突出的阻燃耐久性。Lyocell@CAT@APA内的季铵结构与APA中的磷酸根和羧酸根形成不对称离子键，在洗涤过程中有效屏蔽Na+离子与磷酸盐基团的结合，从而提高耐久性。此外,羧酸盐基团对Na+离子的消耗进一步阻止了它们与磷酸盐基团的结合，这有助于提高耐久性能。阻燃机理分析表明，气相和凝聚相协同赋予Lyocell纤维优异的阻燃性。总的来说,这一创新战略为发展生物安全，耐用,和阻燃纤维素纺织品。
