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首页> 外文期刊>Polymers for advanced technologies >Flammability reduction of flexible polyurethane foams via carbon nanofiber network formation
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Flammability reduction of flexible polyurethane foams via carbon nanofiber network formation

机译：通过碳纳米纤维网络的形成降低柔性聚氨酯泡沫的可燃性

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Untreated polyurethane flexible foams (PUFs) are prone to rapid fire growth due to their low density and low thermal conductivity. Furthermore, the low viscosity of the decomposition products generates severe dripping that increases the fire hazard related to the combustion of PUFs. In fact, this downward flow of flaming liquid often results in a pool-fire that promotes flame propagation and boosts the rate of heat release (HRR) due to a significant increase in the burning area and to feed-back between the flame on the pool-fire and the residual foam. In this work the effect of nanoparticles, i.e., clays and carbon nanofibers (CNFs), on the HRR is investigated with special attention given to melt dripping. A modified cone calorimeter test has been developed for this purpose. It is shown that CNFs form an entangled fiber network which eliminates melt dripping and decreases the HRR.
机译：未经处理的聚氨酯软质泡沫塑料（PUF）密度低，导热系数低，因此容易迅速燃烧。此外，分解产物的低粘度会产生严重的滴落，从而增加与PUF燃烧相关的火灾隐患。实际上，由于燃烧面积的显着增加以及池中火焰之间的反馈，燃烧液体的这种向下流动通常会导致池火，从而促进火焰传播并提高放热率（HRR）。 -火和残留的泡沫。在这项工作中，研究了纳米颗粒（即粘土和碳纳米纤维（CNF））对HRR的影响，并特别关注熔滴。为此，已经开发了一种改进的锥形量热仪测试。结果表明，CNF形成了纠缠的纤维网络，消除了熔体滴落并降低了HRR。

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