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首页> 外文期刊>Polymers for advanced technologies >Synergistic effects of 4A zeolite on the flame retardant properties and thermal stability of a novel halogen-free PP/IFR composite
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Synergistic effects of 4A zeolite on the flame retardant properties and thermal stability of a novel halogen-free PP/IFR composite

机译：4A沸石对新型无卤PP / IFR复合材料阻燃性能和热稳定性的协同作用

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摘要

The synergistic effects of 4A zeolite (4A) on the thermal degradation, flame retardancy and char formation of a novel halogen-free intumescent flame retardant polypropylene composites (PP/IFR) were investigated by the means of limiting oxygen index (LOI), vertical burning test (UL-94), digital photos, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), cone calorimeter test (CCT), laser Raman spectroscopy (LRS) and X-ray photoelectron spectroscopy (XPS). It was found that a small amount of 4A could dramatically enhance the LOI value of the PP/IFR systems and the materials could pass the UL-94 V-0 rating test. Also, it could enhance the fire retardant performance with a great reduction in combustion parameters of PP/IFR system from CCT test. The morphological structures observed by digital and SEM photos revealed that 4A could promote PP/IFR to form more continuous and compact intumescent char layer. The LRS measurement, XPS and TGA analysis demonstrated that the compactness and strength of the outer char surface of the PP/IFR/4A system was enhanced, and more graphite structure was formed to remain more char residue and increase the crosslinking degree.
机译：通过极限氧指数（LOI），垂直燃烧的方法研究了4A沸石（4A）对新型无卤膨胀型阻燃聚丙烯复合材料（PP / IFR）的热降解，阻燃性和炭形成的协同作用。测试（UL-94），数码照片，扫描电子显微镜（SEM），热重分析（TGA），锥形量热仪测试（CCT），激光拉曼光谱（LRS）和X射线光电子能谱（XPS）。发现少量4A可以显着提高PP / IFR系统的LOI值，并且这些材料可以通过UL-94 V-0等级测试。此外，通过CCT测试，它可以通过大大降低PP / IFR系统的燃烧参数来提高阻燃性能。通过数字和SEM照片观察到的形态结构表明4A可以促进PP / IFR形成更连续和致密的膨胀炭层。 LRS测量，XPS和TGA分析表明，PP / IFR / 4A体系的外炭表面的致密性和强度得到增强，并且形成了更多的石墨结构以保留更多的炭残留物并提高了交联度。

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