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首页> 外文期刊>Polymers & Polymer Composites >Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends
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Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

机译：红磷母料与可膨胀石墨对聚丙烯/热塑性聚氨酯共混物的易燃性和热稳定性的协同作用

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摘要

The flammability characterization and synergistic effects of red phosphorus masterbatch (RPM) with expandable graphite (EG) in flame-retardant polypropylene (PP)/thermoplastic polyurethane (TPU) composites are investigated by limiting oxygen index, UL-94 testing, cone calorimeter tests, thermal gravimetric analysis, Fourier transform infrared (FTIR), and scanning electron microscopy. The results show that the flame retardancy of PP/TPU/EG/RPM composites is greatly influenced by RPM. The synergistic effects between RPM and EG take place in the flame-retardant composites. The presence of RPM with EG decreases significantly the heat release rates and total heat release, and UL-94 V-0 rating is achieved when suitable amount of RPM substitutes for EG in the PP/TPU/EG/RPM composites. The T (onset) and T (10 wt%) of the composites are improved because of the presence of RPM. The FTIR spectra show that the incorporation of RPM improves the thermo-oxidative stability of PP/TPU at higher temperatures. The morphological observations indicate the reinforcement of thermal stability, and flame-retardant performance is attributed to the compact and stable char layers promoted by RPM with EG acted as an effective heat barrier and thermal insulation.
机译：通过限制氧指数，UL-94试验，锥形量热计测试，研究了红磷母料（例如，在阻燃聚丙烯（PP）/热塑性聚氨酯（TPU）复合材料中的可燃性表征（RPM）的可燃性表征和协同作用。热重分析，傅里叶变换红外（FTIR），以及扫描电子显微镜。结果表明，PP / TPU / EG / RPM复合材料的阻燃性受RPM的大大影响。 RPM与例如阻燃复合材料之间的协同效应。当合适量的RPM替代物（例如PP / TPU / EG / RPM复合材料）时，实现RPM的存在明显降低的RPM和总热释放和UL-94V-0等级。由于RPM的存在，复合材料的T（发作）和T（10wt％）得到改善。 FTIR光谱表明RPM的掺入在较高温度下提高了PP / TPU的热氧化稳定性。形态学观察表明热稳定性的加强，阻燃性能归因于由RPM促进的紧凑且稳定的炭层，其具有例如有效的热屏障和绝热。

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