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Synergistic effect of aluminum hypophosphite and intumescent flame retardants in polylactide

机译：次磷酸铝与膨胀型阻燃剂在聚丙交酯中的协同作用

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Aluminum hypophosphite (AHP) was introduced into polylactide/intumescent flame retardant (PLA/IFR) systems by melt blending. The flame retardant and thermal properties of the PLA composites were investigated. The results suggest that a synergistic effect exists between IFR and AHP on the char formation and anti-dripping behavior of PLA composites. The PLA/IFR composites containing 10wt% IFR can pass the UL-94V-0 rating but the test is accompanied by heavy melt dripping. For the PLA/AHP a UL-94V-2 rating is obtained for the same loading of IFR. However, the composites containing 7wt% IFR and 3wt% AHP pass the UL-94V-0 rating with modified dripping behavior. Moreover, the char from combustion of PLA/IFR is flexible but of poor quality. That for PLA/AHP is brittle with many cracks. In contrast, that for PLA/IFR/AHP is strong and compact. Thus it can resist the erosion due to heat and gas formation and protect the inside of the matrix. In addition, AHP causes the crosslinking among APP, which promotes the char formation and prevents the melt dripping. This is the main reason for the good flame retardant properties of PLA composites. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：通过熔融共混将次磷酸铝（AHP）引入聚丙交酯/膨胀型阻燃剂（PLA / IFR）系统中。研究了PLA复合材料的阻燃性和热性能。结果表明，IFR和AHP之间存在协同作用，对PLA复合材料的炭形成和抗滴落行为具有影响。包含10wt％IFR的PLA / IFR复合材料可以通过UL-94V-0等级，但该测试伴随着大量熔体滴落。对于PLA / AHP，在相同的IFR负载下获得UL-94V-2等级。但是，含有7wt％IFR和3wt％AHP的复合材料通过了具有改进的滴落性能的UL-94V-0等级。此外，PLA / IFR燃烧产生的焦炭具有柔韧性，但质量较差。 PLA / AHP的脆性很多。相反，PLA / IFR / AHP的坚固而紧凑。因此，它可以抵抗由于热量和气体形成而造成的腐蚀，并保护基体内部。另外，AHP引起APP之间的交联，从而促进了炭的形成并防止了熔体的滴落。这是PLA复合材料具有良好阻燃性能的主要原因。版权所有（c）2015 John Wiley＆Sons，Ltd.

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