School of pharmacy Weifang Medical University Weifang 261053, Shandong P. R. China.
Shandong Engineering Research Center for Smart Materials and Regenerative Medicine Weifang Medical University Weifang 261053, Shandong P. R. China.
ChemistryOpen. 2020 May 20;9(5):593-598. doi: 10.1002/open.202000059. eCollection 2020 May.
Cyclotriphosphazene (CP) based porous organic polymers (POPs) have been designed and prepared. The introduction of CP into the porous skeleton endowed special thermal stability and outstanding flame retardancy to prepared polymers. The nonflammable level of PNK-CMP fabricated via the condensation of 2,2'-(1,4-phenylene)diacetonitrile (DAN) and hexakis(4-acetylphenoxy)cyclotriphosphazene (HACTP) through Knoevenagel reaction, in vertical burning tests reached V-2 class (UL-94) and the limiting oxygen index (LOI) reached 20.8 %. When used as additive, PNK-CMP could suppress the dissolving out of PEPA effectively, reducing environment pollution and improving the flame retardant efficiency. The POP and PEPA co-added PU (m%: m%=5.0 %: 5.0 %) could not be ignited under simulated real-scale fire conditions. The nonflammable level of POP/PEPA/PU in vertical burning tests (UL-94) reached V-0 class with a LOI as high as 23.2 %. The smoke emission could also be suppressed, thus reducing the potential for flame spread and fire hazards. Furthermore, carbonization of PNK-CMP under the activation of KOH yield a hyperporous carbon (PNKA-800) with ultrahigh BET surface area (3001 m g) and ultramicropore size showing excellent ORR activity in alkaline conditions.
环三磷腈（CP）基多孔有机聚合物（POPs）已被设计和制备。CP 的引入赋予了制备聚合物特殊的热稳定性和卓越的阻燃性。通过 Knoevenagel 反应缩合 2,2'-(1,4-亚苯基)二乙腈(DAN)和六(4-乙酰苯氧基)环三磷腈(HACTP)制备的PNK-CMP，在垂直燃烧测试中达到 V-2 级（UL-94），氧指数（LOI）达到 20.8%。当用作添加剂时，PNK-CMP 可以有效抑制 PEPA 的溶解，减少环境污染并提高阻燃效率。POP 和 PEPA 共添加的 PU（m%：m%=5.0%：5.0%）在模拟实际火灾条件下无法点燃。POP/PEPA/PU 在垂直燃烧测试（UL-94）中的不燃等级达到 V-0 级，LOI 高达 23.2%。烟雾排放也可以得到抑制，从而降低火焰蔓延和火灾风险的可能性。此外，在 KOH 的活化作用下，PNK-CMP 的碳化生成具有超高 BET 表面积（3001 m g）和超微孔尺寸的超多孔碳（PNKA-800），在碱性条件下表现出优异的 ORR 活性。
