Intrinsically anti-flammable and self-toughened phosphorylated?cardanol-derived novolac?epoxy?thermosets

编号 020029503

推送时间 20210614

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Intrinsically anti-flammable and self-toughened phosphorylated?cardanol-derived novolac?epoxy?thermosets

来源期刊 Industrial Crops & Products

期 第295期

发表时间 20210407

关键词 Cardanol;  Phosphorylation;  Epoxy?thermosets;  Intrinsic anti-flammability;  Toughening; 

摘要 To overcome the?flammability?and brittleness of DGEBA,?cardanol?was selected to synthesize bio-based?epoxy?in this work because of its unique structure with both rigid aromatic rings and flexible long fatty chains. A novel intrinsically anti-flammable and self-toughened?cardanol-derived novolac?epoxy?was synthesized through condensation, phosphorylation, and?epoxidation?processes, with a?cardanol-based?epoxy?monomer without phosphorylation (ECF) as a contrastive sample. TGA results showed that the char yield of ECF-PO(OPh)2/DDM was much higher than those of DGEBA/DDM and ECF/DDM?thermosets?due to the catalytic charring effect of phosphate species. The DGEBA/DDM and ECF/DDM?thermosets?exhibited high?flammability, whereas the ECFPO(OPh)2/DDM possessed exceptional anti-flammability. Specifically, the?cured?ECF-PO(OPh)2/DDM possessed a high LOI value of 33.5 % and UL-94 V-0 rating; the PHRR, THR, and TSP values measured by cone calorimeter test were declined by 69.5 %, 28.6 %, and 16.4 % compared to those of the commercial DGEBA/DDM?thermoset. Besides, the?cured?ECF-PO(OPh)2/DDM?thermoset?showed good toughness originated from the long fatty chain of?cardanol. This as-synthesized phosphorylated?cardanol-derived novolac?epoxy?possesses simultaneously fire-safe and toughening characteristics, which could be a renewable substitute for commercial DGEBA counterpart to overcome its?flammability?and brittleness.

服务人员 尚玮姣

服务院士 宋湛谦

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