节点文献
新型含硅芳基乙炔的固化及成炭机理研究
Study on curing and pyrolytic mechanism of new PSAA resin
【摘要】 通过FTIR、DSC、TG和XRD等分析了新型含硅芳基乙炔树脂的组成、固化反应、炭化过程、炭化机理及热分解动力学。结果表明,树脂主链上含有Si元素,在222℃发生Diels-Alder固化反应;固化树脂的起始热分解温度为380℃,900℃的残留率为89.5%。热解动力学分析表明,树脂的炭化分为几个阶段,在250~445℃阶段,为引发阶段,结构变化小;450~725℃为热分解阶段,聚合物的主链破坏并转变为玻璃态炭结构;在830~855℃是芳环发生脱氢交联反应引起的放热阶段;860~895℃为碳化物逐渐向乱层石墨结构转变,此阶段以后热稳定性高。XRD和拉曼光谱表明,1 500℃处理后出现SiC峰,2 200℃处理后出现石墨峰,表明材料在高温处理时可发生部分石墨化。
【Abstract】 Composition,cure reaction,pyrolytic mechanism and thermal decomposition kinetics of PSAA were investigated by using FTIR,DSC,TG and XRD.The results show that main chain of resin contains Si element,and Diels-Alder cure reaction occurs at 222 ℃;initial thermal decomposition temperature of cured resin is 380 ℃,and the char yield at 900 ℃ is 89.5%.Thermal pyrolysis kinetic analysis shows that the pyrolytic process of resin could be divided into four steps,i.e.less structure change stage at 250~445 ℃,thermal decomposition stage at 450~725 ℃,during which main-chain of polymer can be destructed and transited into glass carbon structure,exothermic reaction stage at the 830~855 ℃ due to aromitic ring dehydrogenation,and the stage at 860~895 ℃,during which the carbide can be changed into random layer graphite structure and the thermal stability becomes higher.XRD and Raman spectra shows that the SiC and graphite peak appear after 1 500 ℃ and 2 200 ℃ treatment respectively,which indicates that resin had been graphitized partly during high-temperature treatment.
【Key words】 PSAA; cure; pyrolytic mechanism; thermal pyrolysis kinetics;
- 【文献出处】 固体火箭技术 ,Journal of Solid Rocket Technology , 编辑部邮箱 ,2009年05期
- 【分类号】TB332
- 【被引频次】5
- 【下载频次】146