Abstract
To counter the paper flammability, Silk fibroin-Polyquaternium-10/Melamine phosphate-SiO2 (SF-JR400/MP-SiO2) based on natural silk protein may be applied to the Dongba Paper (DBP) surface using layer-by-layer assembly. The microstructure and composition of the coating may be assessed using a scanning electron microscope, fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy. The presence of the coating increases the paper combustion limiting oxygen index from 20.4 to 38.0%. Compared to the untreated DBP, TGA analysis shows that the initial decomposition temperature of the 25-layer assembly rises from 115 to 148 °C, and the residual char yield increases from 11.3 to 38.8%. XPS shows that the formation of a char on the coating surface protects the internal fibers of paper from heat feedback and consequent thermal decomposition. Analysis using cone calorimeter tests (CONE) indicates that a 25-layer assembly can reduce the peak and total heat dissipation by 88.4% and 54.7%, respectively analysis suggests that silk protein may function as an agent to accelerate the coating, formation of a protective. This work provides technical implications to produce flame-retardant handmade paper.
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Acknowledgments
This work was supported by the Research Fund for Advanced Talents of Jiangsu University, China (Grant No.15JDG147) and Key R&D Plan in Anhui Province, China (202004g01020012). Also, thanks eceshi (www.eceshi.com) for the FTIR analysis.
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Sun, Z., Li, Z., Ma, Z. et al. Natural silk fibroin based flame retardant LbL-coating for Dongba paper. Cellulose 29, 9393–9406 (2022). https://doi.org/10.1007/s10570-022-04832-y
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DOI: https://doi.org/10.1007/s10570-022-04832-y