PC/纳米SiO_2复合材料的热降解行为

Thermal degradation behavior of PC/nano-SiO_2 composite

采用熔融共混法制备了聚碳酸酯(PC)/纳米二氧化硅(SiO2)复合材料。采用X射线衍射和扫描电子显微镜研究了PC和PC/纳米SiO2复合材料的结构,采用热重分析了PC和PC/纳米SiO2复合材料的热降解行为,用Kissinger-Akahira-Sunose法研究了PC和PC/纳米SiO2复合材料的热降解动力学。结果表明:PC的内部结构没有发生变化,且纳米SiO2在基体中分散均匀;加入纳米SiO2能显著改善PC的热稳定性,且PC和PC/纳米SiO2复合材料的热降解温度均随升温速率提高呈线性增加;PC和PC/纳米SiO2复合材料的热降解活化能均随转化率升高而增加,且PC/纳米SiO2复合材料的活化能明显高于PC。

Polycarbonate （PC）/nano-silica （nano-SiO2） composite was prepared by melt blending. The structure of PC and the composite was studied by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, the thermal degradation behavior of PC and the composite was analyzed by thermogravimetry （TG）, and the thermal degradation kinetics of PC and the composite was studied by Kissinger-Akahira-Sunose method. The results indicate that the interior structure of PC has no change and the nanoparticles disperse evenly in the matrix. The thermostability of PC is improved markedly by adding SiO2 nanoparticles, and the thermal degradation temperatures of PC and the composite increase linearly with the increase in the heating rate. The thermal degradation activation energy of both materials shows a rising trend with the increase of the conversion and the activation energy of PC/nano-SiO2 is higher significantly than that of PC at each conversion.