摘要
采用氧指数、TGA-DSC以及SEM等分析方法,研究了耐热添加剂对硅橡胶阻燃性能的影响。研究表明,耐热添加剂Fe2O3,CeO2和TiO2可提高硅橡胶的耐热空气老化性能和阻燃性能,300℃高温老化对硅橡胶的阻燃性能影响不明显。耐热添加剂能抑制硅橡胶侧链基团的氧化断裂,提高起始分解温度30℃以上,降低分解释放热62%以上。燃烧灰烬中SEM分析表明,耐热添加剂是通过消除自由基的机制,阻止了氧对硅橡胶侧基的攻击,从而明显减轻硅橡胶的热分解,提高了阻燃性能。
The effect of heat-resistant additive on flammability of silicone rubber was investigated by analysis method such as Oxygen Index,TGA-DSC and SEM.It is found that the heat-resistant additives Fe2O3,CeO2 and TiO2 improve the hot air ageing properties and flame-resistance of silicone rubber,but the effect of 300℃ hot air on flammability of silicone rubber is indistinct.Heat-resistant additive inhibits oxidized breakage of the pendant group of silicone rubber,and the initial decomposition temperature is increased more than 30℃,and the decomposition release heat is decreased about 62%.The SEM of combustion results show that through the mechanism of eliminating free-radical,heat-resistant additive can inhibit oxygen from attacking to the pendant group,thereby reducing the decomposition of silicone rubber obviously and improving the flammability of silicone rubber.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第5期66-70,共5页
Journal of Aeronautical Materials
关键词
硅橡胶
耐热添加剂
阻燃性能
silicone rubber
heat-resistant additive
flammability
