Wu Chang, Wu Zong-Xing, Long Shu-Jin, Luo Xi, Cheng Xian-Wei, Guan Jin-Ping
Key Laboratory of Flame Retardancy Finishing of Textile Materials (CNTAC), College of Textile and Clothing Engineering, Soochow University, 199 Renai Road, Suzhou 215123, China.
Key Laboratory of Flame Retardancy Finishing of Textile Materials (CNTAC), College of Textile and Clothing Engineering, Soochow University, 199 Renai Road, Suzhou 215123, China; Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production (ERC), Soochow University, 199 Renai Road, Suzhou 215123, China.
Int J Biol Macromol. 2024 Dec;283(Pt 4):137956. doi: 10.1016/j.ijbiomac.2024.137956. Epub 2024 Nov 22.
The development of sustainable and durable flame-retardant protein silk fabric without compromising its physical properties is of interest but challenging. In this study, a fully biobased reactive flame-retardant, vanillin phytate, was synthesized from biomass phytic acid and vanillin. Subsequently, vanillin phytate was covalently grafted onto silk fabrics along with diethyl phosphite under mild conditions via the Kabachnik-Fields reaction. The chemical structure of vanillin phytate and its potential cross-linking mechanism with silk fibers, thermal stability, combustion behavior, flame retardancy, washing durability, and mode of action of the modified silk fabrics were investigated. The modified silk exhibited a significant reduction in heat and smoke release by 63.8 % and 90 %, respectively, versus pristine silk. The modified silk fabrics also demonstrated excellent self-extinguishing capacity, with a reduced damaged length of 7.0 cm and an increased limiting oxygen index of over 34 %. Furthermore, the modified silk fabric maintained self-extinguishing performance after 25 washing cycles, showing high flame-retardant efficiency and good washing durability. The char residue analyses revealed that the modification primarily exerted its flame-retardant effect in the condensed phase. Interestingly, the present strategy had less influence on the physical performance of silk fabrics, indicating a wide range of practical applications.
开发出既可持续又耐用、且不影响其物理性能的阻燃蛋白质丝绸织物很有意义，但也具有挑战性。在本研究中，由生物质植酸和香草醛合成了一种完全基于生物的反应型阻燃剂——香草醛植酸。随后，在温和条件下，香草醛植酸与亚磷酸二乙酯通过卡巴契克-菲尔德反应共价接枝到丝绸织物上。研究了香草醛植酸的化学结构及其与丝绸纤维的潜在交联机理、热稳定性、燃烧行为、阻燃性、洗涤耐久性以及改性丝绸织物的作用方式。与原始丝绸相比，改性丝绸的热释放和烟雾释放分别显著降低了63.8%和90%。改性丝绸织物还表现出优异的自熄能力，受损长度减少至7.0厘米，极限氧指数提高超过34%。此外，改性丝绸织物在25次洗涤循环后仍保持自熄性能，显示出高阻燃效率和良好的洗涤耐久性。残炭分析表明，改性主要在凝聚相中发挥其阻燃作用。有趣的是，目前的策略对丝绸织物的物理性能影响较小，表明其具有广泛的实际应用前景。
