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• W4319462006 abstract "ABSTRACTTo improve the flame retardancy of phenolic foam from the perspective of sustainable development, it is a feasible way to add bio-based flame retardants into phenolic foam. Lignin has a similar structure to phenol, which provides a possibility to replace part of phenol. In this paper, we prepared a kind of reactive bio-based flame retardant based on enzymatic hydrolyzed lignin, in which side chain was chemically grafted with phosphorus and nitrogen and benzene ring would participate in the phenolic condensation reaction. According to elemental analysis and ICP-OES data, the content of nitrogen and phosphorus in modified lignin (NP-L) increased to 2.95% and 3.55% respectively. Compared with original lignin, the carbon residue rate of NP-L increased from 3.25% to 12.13% because of the presence of flame retardant elements N and P. Then lignin-based flame retardant was used to replace phenol for modifying phenolic foams (NPLPFX). The limited oxygen index (LOI) and compressive strength of phenolic foam were improved effectively by adding modified lignin when the substitution rate was less than 25%. The LOI and compressive strength of the modified phenolic foam with 5% replacement amount (NPLPF5) are 55.6% and 0.24 MPa, which increased by 88% and 60% compared with pure phenolic foam. The cone calorimetric data also showed that NPLPF5 had good flame retardancy, and the peak heat release rate and total heat release were significantly lower than PF. This work suggests a novel green strategy for improving the flame retardancy performance of phenolic foam and promoting the utilization of lignin.KEYWORDS: Modified ligninflame retardancyphenolic foam AcknowledgementsThis work was supported by the National Key Research and Development Program of China (Grant No. 2021YFC2101604), the National Natural Science Foundation of China (Grant Nos. 31890773 and 32071718 to X.H. Yang), the Research Funds of Jiangsu Key Laboratory for Biomass Energy and Material (Grant Nos. JSBEM-S-201803 to X.H. Yang).Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe authors confirm that the data supporting the findings of this study are available within the article.Correction StatementThis article has been corrected with minor changes. These changes do not impact the academic content of the article." @default.
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• W4319462006 date "2023-02-20" @default.
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• W4319462006 title "Synthesis of a reactive lignin-based flame retardant and its application in phenolic foam" @default.
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• W4319462006 doi "https://doi.org/10.1080/09593330.2023.2176792" @default.
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