This paper is aimed to illustrate the structure and thermal property of intumescent char produced by flame‐retardant polymers containing expandable graphite (EG). For this purpose, high‐impact polystyrene (HIPS) flame retarded by EG individually or in combination with microencapsulated red phosphorus (MRP) was prepared. The results indicate that the intumescent char from HIPS/EG/MRP composite, which contains a small amount of phosphorus element and more oxygen element, is much more compact and continuous than that from HIPS/EG composite with identical loading of flame retardant due to binding effect of phosphoric acid and its derivatives. The intumescent char produced by HIPS/EG/MRP composite exhibits much enhanced thermal and thermo‐oxidative stability as well as thermal‐insulating effect, which can withstand destruction of heat and oxygen effectively and thus provide a good fire‐proof barrier. The temperature beneath this intumescent char is decreased significantly in case of action by flame. By comparison, the porous and loose intumescent char generated by HIPS/EG composite has poor thermo‐oxidative endurance, and most of it can be consumed in air at high temperature without effective protection for the polymer. This has resulted in remarkable increase in flame retardancy of the HIPS/EG/MRP composite.

中文翻译：

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阻燃高抗冲聚苯乙烯/可膨胀石墨/微囊化红磷复合材料产生的膨胀炭的结构和热性能

本文旨在说明由含可膨胀石墨（EG）的阻燃聚合物生产的膨胀炭的结构和热性能。为此，制备了单独或与微囊化的红磷（MRP）结合使用EG阻燃的高抗冲聚苯乙烯（HIPS）。结果表明，HIPS / EG / MRP复合材料中的膨胀炭含有少量的磷元素和更多的氧元素，比起HIPS / EG复合材料，由于结合，阻燃剂的负载量相同，其致密性和连续性要高得多。磷酸及其衍生物的作用。由HIPS / EG / MRP复合材料生产的膨胀型炭表现出大大增强的热和热氧化稳定性以及隔热效果，可以有效抵抗热量和氧气的破坏，从而提供良好的防火屏障。在火焰作用下，这种膨胀炭的温度会大大降低。相比之下，HIPS / EG复合材料产生的多孔和疏松膨胀性炭具有较差的热氧化耐力，并且大部分可在高温下在空气中消耗，而无法有效保护聚合物。这导致HIPS / EG / MRP复合材料的阻燃性显着提高。大部分在没有有效保护聚合物的情况下可在高温空气中消耗。这导致HIPS / EG / MRP复合材料的阻燃性显着提高。而且大部分都可以在高温下在空气中消耗，而无法有效保护聚合物。这导致HIPS / EG / MRP复合材料的阻燃性显着提高。