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首页> 外文期刊>Polymers for advanced technologies >Effect of exfoliation on poly(styrene-co-acrylonitrile)/montmorillonite nanocomposite flammability
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Effect of exfoliation on poly(styrene-co-acrylonitrile)/montmorillonite nanocomposite flammability

机译：剥落对聚苯乙烯-丙烯腈/蒙脱土纳米复合材料可燃性的影响

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摘要

Montmorillonite clays (MMT) have shown potential as non-halogenated fire retardants in polymer blends, but the effect of morphology of the resulting nanocomposite is not well understood. In this article MMT blends are studied in a styrene-acrylonitrile copolymer (SAN) matrix to get structure-property relationships relating to the more complex problem of flame retardancy (FR) of acrylonitrile-butadiene-styrene copolymer (ABS) computer housings. The morphology observed in SAN/ MMT blends using twin screw extrusion was complex, and was affected by the compatibilizing amine head group substituent size, the amine tail group length, and the amine exchange ratio. However, the morphology did not affect flammability properties significantly. The most important determinant of FR properties was clay loading. Peak heat release rate was reduced up to 49% at a loading of about 12% organoclay, using a 2-ethylhexyl dimethyl hydrogenated tallow ammonium surfactant. Backside temperatures were measured during FR tests, and significant reductions in maximum heat soak temperature and time to reach heat soak temperature were noted as exfoliation increased, supporting the theory that the clays have an insulative effect.
机译：蒙脱土粘土（MMT）在聚合物共混物中已显示出作为非卤代阻燃剂的潜力，但对所得纳米复合材料的形态学影响尚不甚了解。在本文中，在苯乙烯-丙烯腈共聚物（SAN）基质中研究MMT共混物，以获得与丙烯腈-丁二烯-苯乙烯共聚物（ABS）计算机外壳的阻燃性（FR）更为复杂的问题相关的结构-性能关系。在使用双螺杆挤出的SAN / MMT共混物中观察到的形态很复杂，并且受相容的胺首基取代基尺寸，胺尾基长度和胺交换率的影响。但是，形态并未显着影响可燃性。 FR性能最重要的决定因素是粘土含量。使用2-乙基己基二甲基氢化牛脂铵表面活性剂，在负载约12％的有机粘土时，峰值放热率降低至49％。在FR测试过程中测量了背面温度，并且随着剥落的增加，最大保温温度和达到保温温度的时间显着减少，这支持了粘土具有绝缘作用的理论。

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