Abstract
How to improve the flame retardancy of lyocell fibers has become an important issue in textile industry. Herein, lyocell fibers were firstly undergone etherification reaction between sodium chloroacetate and the hydroxyl groups of lyocell fibers to obtain carboxymethylated lyocell fibers (CM-lyocell), then the sodium ions of CM-lyocell were replaced by aluminum ions, and the flame retardant lyocell fibers (FR-lyocell) were prepared. Compared with lyocell fibers, the degradation temperature of FR-lyocell decreased by about 80 °C, and the char residue in nitrogen increased from 15.1 to 31.8 wt% at 800 °C. Importantly, the limiting oxygen index (LOI) value of FR-lyocell fabric was increased from 17.2 to 26.4%. Besides, the peak of heat release rate (PHRR) and total heat release (THR) of FR-lyocell had 77.4% and 76.3% reduction, respectively. The FR-lyocell can generate a highly graphitized char layer and release more water at high temperatures, which are beneficial to improving the flame retardancy of lyocell fibers. Moreover, the tensile test showed that the tensile strength of FR-lyocell decreased from 3.95 to 3.08 cN/dtex with a 22% reduction, showing good strength retention.
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The authors are very grateful for the financial supports of the National Natural Science Foundation of China (No. 51573134) and the National Key Research and Development Program of China (2017YFB0309000).
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XG and YW contributed equally to this work. XG conceived the idea and designed the experiments. YW contributed to the material fabrication. YW conducted the thermal properties measurement and analyzed the corresponding results. XG was responsible for the SEM images, the combustion testing, FT–IR measurements. XG and YW contributed to the microscale combustion calorimetry and the corresponding analysis. YLR and XHL co-wrote and revised the manuscript. All authors commented on the final manuscript.
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Guo, X., Wang, Y., Ren, Y. et al. Fabrication of flame retardant lyocell fibers based on carboxymethylation and aluminum ion chelation. Cellulose 28, 6679–6698 (2021). https://doi.org/10.1007/s10570-021-03931-6
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DOI: https://doi.org/10.1007/s10570-021-03931-6