Fabrication of a bi-hydroxyl-bi-DOPO compound with excellent quenching and charring capacities for lignin-based epoxy resin

编号 020034802

推送时间 20220620

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Fabrication of a bi-hydroxyl-bi-DOPO compound with excellent quenching and charring capacities for lignin-based epoxy resin

来源期刊 International Journal of Biological Macromolecules

期 第348期

发表时间 20220430

关键词 Lignin;  DOPO;  Bi-hydroxyl; 

摘要 In this study, lignin-based epoxy resins (EP) were fabricated using lignin, phenol and glyoxal as crosslinking reagents. For improving the flame retardancy, a bi-DOPO compound with bi-hydroxyl structure was successfully synthesized, containing excellent quenching and charring capacities. Good?pyrolysis?behaviors of as-synthesized flame retardant resulted in significant quenching effect via structure decomposition to release POradical dot?and PO2radical dot?free radicals for capturing reactive Hradical dot?and OHradical dot?radicals produced from epoxy combustion. With addition of 0.18?wt% phosphorus, epoxy composite (10% LPG-ER-4) passed V-0 rating with high limited oxygen index (LOI) value of 35.2%. Cone calorimeter tests showed that heat release (including heat release rate (HRR) and total heat release (THR)) from combustion was reduced with assistance of flame retardant. Char residue analyses illustrated that bi-hydroxyl structure in DOPO-based flame retardant benefited the formation of char layer with higher compactness and integrity to serve as a protective shell of interior epoxy matrix. Furthermore, exterior pore size of char residue was narrowed or blocked to avoid the release of heat and volatiles generated from combustion. This study provided a feasible method to improve flame retardancy of lignin-based EP and proposed flame-retardant mechanism both in gaseous and solid phases.

服务人员 尚玮姣

服务院士 宋湛谦

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