摘要
研究了多种聚碳酸酯材料的热分解特性,考察了其热分解特性与热释放的关系。结果表明,在空气条件下聚碳酸酯材料都表现出了两个阶段分解的特性,氧气会导致聚碳酸酯材料热稳定性降低和炭层氧化。溴系阻燃剂的加入会导致聚碳酸酯的热失重峰值温度(DWPT)提高,这意味着峰值出现的时间将延后,效果以溴系阻燃剂PBBC最为明显。硅氧烷成分的加入有助于提高聚碳酸酯的耐热性和成炭性,显著降低热释放,但是会提高质量热损失峰值速率(DWPV)。碳酸钙的加入不但会降低聚碳酸酯的耐热性和成炭性,而其同时降低DWPV。硅氧烷成分和碳酸钙同时加入对降低DWPV具有显著的协同作用。添加20%溴系阻燃剂PBBC可以显著降低聚碳酸酯热释放峰值(PHRR)、2min热释放总量(THR)和DWPV,添加碳酸钙能够使DWPV进一步降低,但是对降低热释放没有任何帮助,反而会导致THR显著增加。这也说明,DWPV的降低并不一定导致材料的PHRR和THR也同时降低。
The thermal decomposition characteristics of several polycarbonates （PC） and its relationship between thermal decomposition characteristics and its heat release were studied in this paper. The results indicated that under the air condition the thermal degradation curve of PC displayed a double decomposition characteristic, and the existence of oxygen resulted in the decrease of the material thermal stability and the carbon layer oxidation. The derivative weight peak temperature （DWPT） of PCs increased with the addition of bromine flame retardants, meanwhile the peak time shift to the higher value range, especially the addition of bromine flame retardant （PBBC）. The introduction of siloxane into the polycarbonates can improve the heat resistance, char-formation, reduce the heat release and increase the derivative weight peak （DWPV）. The addition of calcium carbonate into the polycarbonates can reduce the heat resistance char-formation and the DWPV. The addition of both siloxane and calcium carbonate in the polycarbonates had a significant synergistic effect on reducing the DWPV. Adding 20% PBBC into polycarbonate can significantly reduce the peak heat release rate （PHRR）, total amount of heat release （THR） in 2 minutes and DWPV; Adding calcium carbonate into polycarbonate can further reduce DWPV, had no effect on the reducing of the heat release rate, and increase the THR at 2 minutes. All of these experiment phenomena showed that the reduction of DWPV did not mean the lower value of PHRR and THR.
出处
《塑料工业》
CAS
CSCD
北大核心
2014年第1期55-58,共4页
China Plastics Industry
基金
国家自然科学基金项目(61179050)
关键词
聚碳酸酯
热降解
热释放
Polycarbonate
Thermal Decomposition
Heat Release
