文章通过聚乙烯醇( PVA) 与硐酸( H3BO3) 交联制备成水凝胶薄膜, 添加焦磷酸三聚氛胺( MPP) 提高 PVA / MPP sŠ水凝胶薄膜的阻燃性能, ·添加20 wt% MPP ¿, PVA 阻燃性能óÞ UL94 V0 +, MPP 的加v可有效降低水凝胶薄膜的热释放速度( HRR) 和发烟里｡ 实验结果表明, MPP 与 PVA 分子之间的氢键相互作用可以保持材料的力学性能, 提高材料的阻燃性能｡ PVA / MPP 水凝胶膜的阻燃机理是气相与凝聚相阻燃机理的协同作用, MPP 分解为三聚氛胺和磷酸, 然后三聚氛胺转化为 N2 和 CO2 , 磷酸促进 PVA 水凝胶形成连续致密的炭层, 阻碍了与外界的氧气和热里交换｡

In this work, Polyvinyl alcohol ( PVA) was crosslinked via Boric acid( H3 BO3 ) and prepared to be the hydrogel film. MPP is used to improve the flame retardant properties of the PVA hydrogel films. The experimental results showed that the PVA / MPP hydrogel films could achieve UL94 V0 rating with a 20 wt% addition of MPP which could effectively reduce the HRR and the smoke emission of the PVA hydrogel films. The flame retardant mechanism of the PVA / MPP hydrogel films is a synergistic effect of gasphase with condensed phase flame retardant mechanism. MPP decomposed into melamine and phosphoric acid, then melamine converted to N2 and CO2; Phosphoric acid promoted the PVA hydrogels formation of a continuous and dense char layer which hinders the exchange of oxygen and heat with the outside. At the same time, because of the interaction be tween MPP and PVA, the mechanical properties of PVA are maintained while the flame retardancy of PVA is improved.