Journal of Chemical Sciences ( IF 1.7 ) Pub Date : 2022-01-23 , DOI: 10.1007/s12039-021-02006-0 Allen Chaparadza 1 , Stephen Majoni 2
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Polystyrene composites containing silicon orthophosphate, taranakite, and aluminum phosphate, were prepared via melt blending and characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis and cone calorimetry. The systematic investigations of the effects of the additives on flame retardancy, thermal decomposition, and pyrolysis behavior of polystyrene were conducted using cone calorimetry and thermogravimetric analysis. Thermogravimetric analysis indicated that the addition of aluminum phosphates caused small increases in thermal stability as evidenced by as low as 4 °C increase in onset degradation temperature and up to 13 °C increase in midpoint degradation temperature. The addition of silicon orthophosphate resulted in increases of between 9 and 27 °C in onset degradation temperature and between 13 and 31 °C in midpoint degradation temperature. Thermal stability increased with loading percentages, with 10 mass% giving the most stability. The addition of the additives at less than 10 weight percent resulted in a 22 to 52% reduction in the peak heat release rate. Whereas there is a significant reduction in the time-to-ignition for the phosphate composites compared to the virgin polymer, there are remarkable reductions in the peak heat release rate, average mass loss rate and smoke production.
Graphical abstract
中文翻译：
磷酸铝和硅对聚苯乙烯热稳定性和可燃性的影响
聚苯乙烯复合材料含有正磷酸硅、taranakite 和磷酸铝，通过以下方法制备：熔融共混并通过粉末X射线衍射、傅里叶变换红外光谱、热重分析和锥形量热法进行表征。采用锥形量热法和热重分析法系统研究了添加剂对聚苯乙烯阻燃性、热分解和热解行为的影响。热重分析表明，添加磷酸铝导致热稳定性小幅增加，起始降解温度增加低至 4°C，中点降解温度增加高达 13°C 就证明了这一点。添加正磷酸硅导致起始降解温度升高 9 至 27 °C，降解中点温度升高 13 至 31 °C。热稳定性随负载百分比而增加，10质量％提供最大的稳定性。添加少于 10 重量百分比的添加剂导致峰值热释放率降低 22% 至 52%。虽然与原始聚合物相比，磷酸盐复合材料的点火时间显着缩短，但峰值热释放率、平均质量损失率和烟雾产生量也显着降低。
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