ASSESSMENT OF HEAT RELEASE OF FILLER-POLYMER COMPOSITES BY CONE CALORIMETRY
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摘要: 研究了应用锥形量热法测量聚合物复合材料燃烧的热释放速率时,填料的分解热效应对测量结果的影响。定量研究表明,对于氢氧化铝和氢氧化镁等阻燃填料,当填料的质量分数超过60%时,填料分解时强烈吸热的特性对于应用锥形量热法测量聚合物基复合材料的热释放速率有明显影响,并且还因聚合物而异。在定量研究的基础上,提出了一种利用分解焓对锥形量热仪测定的有效燃烧热值进行校正,然后再换算成热释放速率的简单方法,并给出了校正后的结果同实测值的比较。Abstract: The effects of the heat absorbed during decomposition of some flame retardant fillers on the heat release rate measurement were studied using the cone calorimeter. It was found that the endothermic effect of the filler decomposition will affect the heat release rate measured by the cone calorimeter especially at higher levels of loading. Without appropriate corrections, the heat release rate measured by the cone calorimeter would be overestimated for high endothermic materials. Some typical materials were studied quantitatively, including alumina trihydrate and magnesium hydroxide. For alumina trihydrate and magnesium hydroxide, at the loading level of 80% in polymers, high overestimation could be produced, depending on the individual polymer used. A simple correction procedure is proposed to correct the heat release rate measurement using the cone calorimeter by modifying the effective heat of combustion using pyrolysis enthalpy. The corrected results and the comparison with the experimental values measured by the cone calorimeter are presented in the paper.
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