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首页> 外文期刊>Polymers for advanced technologies >Flame retardancy and charring behavior of polystyrene-organic montmorillonite nanocomposites
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Flame retardancy and charring behavior of polystyrene-organic montmorillonite nanocomposites

机译：聚苯乙烯-有机蒙脱土纳米复合材料的阻燃性和炭化行为

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摘要

The fire performance of polystyrene-organic montmorillonite (OMMT) nanocomposite was investigated by limiting oxygen index (LOI) and cone calorimetry. Scanning electron microscopy, electron dispersive spectroscopy and attenuated total reflection Fourier transform infrared spectroscopy were employed to study the charring process of the nanocomposite. The residue collected upon thermal degradation was analyzed by various means to determine its composition and to understand the flame-retardant mechanism of the nanocomposite. It has been shown that the introduction of OMMT does not have much influence on LOI of the nanocomposite, but can greatly decrease the heat release rate (HRR) and mass loss rate (MLR) and enhance the flame retardancy of the material. The flame-retardant mechanism is due to charring in the condensed phase. The intercalated nanostructure is destroyed, and the silicate nanolayers in the nanocomposite rearrange and accumulate on the material surface during pyrolysis. The charred residue has a honeycomb-like porous structure, which covers on the material surface and serves as a protection barrier against heat transfer and mass exchange, leading to enhanced flame retardancy. The charred residue is composed of pyrolyzed silicate layers and graphitic char. The char is highly stable in nitrogen even at 800℃, but thermo-oxidative decomposition is allowed, and it can be removed completely in the presence of air. Due to the porous structure of the charred residue, the protection from it is mainly to reduce the HRR and MLR and retard burning of the material. It is not enough to make the nanocomposite self-extinguish.
机译：通过极限氧指数（LOI）和锥形量热法研究了聚苯乙烯-有机蒙脱土（OMMT）纳米复合材料的防火性能。利用扫描电子显微镜，电子色散光谱和衰减全反射傅立叶变换红外光谱研究了纳米复合材料的炭化过程。通过各种方法分析热降解时收集的残留物，以确定其组成并了解纳米复合材料的阻燃机理。已经表明，OMMT的引入对纳米复合材料的LOI没有太大影响，但是可以大大降低热释放率（HRR）和质量损失率（MLR）并增强材料的阻燃性。阻燃机理是由于在冷凝相中炭化。插入的纳米结构被破坏，并且纳米复合物中的硅酸盐纳米层在热解过程中重新排列并积聚在材料表面上。烧焦的残渣具有蜂窝状的多孔结构，该结构覆盖在材料表面，并作为防止热传递和质量交换的保护屏障，从而提高了阻燃性。烧焦的残余物由热解的硅酸盐层和石墨焦组成。该炭即使在800℃的氮气中也非常稳定，但是允许热氧化分解，并且在空气中可以完全去除。由于炭化残渣的多孔结构，对其的保护主要是减少HRR和MLR并阻止材料燃烧。仅使纳米复合材料自熄是不够的。

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