Three biobased epoxy resins from vanillic alcohol, linseed oil and cardanol were crosslinked with phosphoric acid to prepare vitrimers. The reactivities of the different types of epoxy towards phosphoric acid were assessed by ¹H and ³¹P NMR spectroscopy on model molecules. The resulting phosphate esters constitute the nodes of the network, which can exchange with free hydroxy groups upon heating, thus conferring reshaping capability to the materials. Additionally, the phosphate groups endow flame retardant properties to the materials. When exposed to fire a char layer is formed, which insulates the inner part of the material and slows down its combustion. Finally, mixtures of the three epoxy resins led to dynamic materials with both fire retardancy properties and low T_g.

中文翻译：

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磷酸：阻燃可持续玻璃体的资产

将香草醇、亚麻籽油和腰果酚制成的三种生物基环氧树脂与磷酸交联以制备玻璃体。^{通过模型分子的1} H 和³¹ P NMR 光谱评估不同类型的环氧树脂对磷酸的反应性。所得的磷酸酯构成网络的节点，在加热时可以与游离羟基进行交换，从而赋予材料重塑能力。此外，磷酸基团赋予材料阻燃性能。当暴露在火中时，会形成炭层，该层使材料的内部绝缘并减缓其燃烧。最后，三种环氧树脂的混合物产生了具有阻燃性能和低T _g的动态材料。