Effects of ammonium polyphosphate to pentaerythritol ratio on composition and properties of carbonaceous foam deriving from intumescent flame-retardant polypropylene
Effects of ammonium polyphosphate to pentaerythritol ratio on composition and properties of carbonaceous foam deriving from intumescent flame-retardant polypropylene
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DOI：
10.1016/j.polymdegradstab.2014.04.016
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发表时间：
2014-09
影响因子：
5.9
通讯作者：
Yin Xia;Fangfang Jin;Zongwen Mao;Y. Guan;A. Zheng
中科院分区：
文献类型：
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作者：
Yin Xia;Fangfang Jin;Zongwen Mao;Y. Guan;A. Zheng
在我们的工作中，膨胀型阻燃剂(IFR)是由聚磷酸铵(APP)和季戊四醇(PER)组成的经典体系。研究了APP/PER重量比(APP/PER)对聚丙烯(PP)/IFR复合材料炭质泡沫各方面的影响。测试参数包括炭质泡沫的阻燃性和组成，以及结构和热物理性能。PP/IFR复合材料产生的碳质泡沫是磷降解产物(PDP)和不溶性炭黑的物理混合物。APPER对碳质泡沫的结构和热物理性能的影响包括膨胀率、气密性、导热系数和热扩散率。这些性质反过来影响了气体和凝聚相之间的质量(O2和可燃物)和热传递的效率。发泡阶段混合熔体和固化碳质泡沫中PDP的含量被认为是碳质泡沫这些重要性能的主要调节因素。用简明的传热传质理论对阻燃试验结果进行了定性解释。
In our work, a classical system was used for intumescent flame retardant (IFR), consisting of ammonium polyphosphate (APP) and pentaerythritol (PER). Effects of weight ratio of APP to PER (APP-PER ratio) on various aspects of carbonaceous foam deriving from polypropylene (PP)/IFR composites were investigated. Tested parameters included the flame retardancy and composition, as well as the structural and thermophysical properties of the carbonaceous foam. The carbonaceous foam resulting from PP/IFR composites was a physical mixture of phosphorous degradation products (PDPs) and insoluble chars. The structural and thermophysical properties of the carbonaceous foam affected by the APP-PER ratio include its expansion ratio, air tightness, thermal conductivity and thermal diffusivity. These properties in turn affected the efficiency of both mass (O2and combustibles) and heat transfer between the gas and the condensed phases. The content of PDPs in the mixed melt during the foaming stage and in the solidified carbonaceous foam was considered as the main regulator of these important properties of the carbonaceous foam. Concise heat and mass transfer theories were applied to qualitatively explain the results of flame retardant tests.