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首页> 外文期刊>Polymers for advanced technologies >Some comments on the main fire retardancy mechanisms in polymer nanocomposites
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Some comments on the main fire retardancy mechanisms in polymer nanocomposites

机译：关于聚合物纳米复合材料主要阻燃机理的一些评论

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摘要

Barrier formation and increasing the melt viscosity are addressed as the two main general fire retardancy mechanisms of polymer nanocomposites. They result in specific impacts on fire properties that consequentially cause varying flame retardancy efficiency in different fire tests. The barrier formation retards mainly flame spread (peak of heat release rate) in developing fires, but does not reduce fire load (total heat evolved), ignitability or flammability (limiting oxygen index, UL 94). Furthermore, this flame retardancy effect increases with increasing irradiation and vanishes with decreasing irradiation. The increased melt viscosity prevents dripping, which is beneficial or disadvantageous depending on the fire test used. In some test, it become the dominant influence, transforming self-extinguishing samples into flammable materials or causing wicking. Advantages and the limits are sketched comprehensively for exploiting the main general fire retardancy mechanisms of polymer nanocomposites. It is concluded that barrier formation and changing the melt viscosity in nanocomposites are not sufficient for most applications, but must be accompanied by additional mechanisms in special systems or in combination with other flame retardants.
机译：屏障形成和增加熔体粘度被解决为聚合物纳米复合材料的两个主要通用阻燃机理。它们会对防火性能产生特定影响，从而在不同的防火测试中导致不同的阻燃效率。屏障的形成主要阻止火焰在蔓延的火焰中蔓延（放热率的峰值），但不会降低火负荷（放出的总热量），可燃性或可燃性（极限氧指数，UL 94）。此外，这种阻燃效果随着辐射的增加而增加，而随着辐射的减少而消失。增加的熔体粘度可防止滴落，这取决于所使用的耐火测试是有利还是不利。在某些测试中，它成为主要的影响因素，将自熄的样品转变为易燃材料或引起芯吸。全面概述了利用聚合物纳米复合材料主要阻燃机理的优点和局限性。结论是，纳米复合材料的壁垒形成和熔融粘度的改变对于大多数应用来说是不够的，但是必须在特殊系统中或与其他阻燃剂组合使用，并伴随其他机理。

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