摘要
降解芯轴技术是制备激光惯性约束聚变靶丸的重要技术之一。利用热分析技术研究了3种不同引发剂(偶氮二异丁腈(AIBN)、过氧化二叔丁基(DTBP)、过氧化苯甲酰(BPO))对聚α-甲基苯乙烯(PAMS)热降解温度的影响,采用热裂解-气相色谱质谱联用技术分析了PAMS降解产物。研究表明,加入DTBP后,能较大降低PAMS的热降解温度,且不改变PAMS主要降解产物,其完全降解温度为339.8℃,相对未添加引发剂的PAMS,降低近50℃;此外,DTBP加入只起催化降解作用,其添加量的大小对PAMS热降解影响不大,但为降低制靶工艺不确定性,添加DTBP的含量应越小越好。而加入AIBN和BPO的PAMS完全降解温度分别为364.5℃和374.3℃,对提高PAMS的热降解性能没有较大改善,且加入AIBN后会有大分子降解产物出现,直接影响芯轴微球的降解性能及目标靶丸的球形质量。
The decomposable mandrel technique is an important method for fabrication inertial confinement fusion targets. The effects of three kinds of initiators including azobidsisobutyronitrile(AIBN),benzoyl peroxide(BPO) and ditert-butyl peroxide(DTBP) on the thermal degradation of poly(α-methylstyrene)(PAMS) were investigated by TG /DTG. The thermal pyrolysis products of PAMS were characterized by GC-MS. The experimental results show that the complete degradation temperature of PAMS is 339. 8 ℃ with adding DTBP,and 50 ℃ less than that of PAMS without initiators. The thermal pyrolysis behaviour of PAMS is not affected by the DTBP content. To reduce uncertainty of target fabrication,the DTBP content is as little as possible. However,the complete degradation temperatures of PAMS with adding AIBN or BPO are 364. 5 ℃ and 374. 3 ℃,respectively,and there are macromolecules in the pyrolysis products of PAMS with AIBN,which could reduce degradation of PAMS and the quality of targets.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第2期61-66,共6页
Polymer Materials Science & Engineering
基金
国家高技术发展计划项目
关键词
聚α-甲基苯乙烯
降解芯轴技术
引发剂
降解温度
热重分析
poly(α-methylstyrene)
decomposable mandrel technique
initiator
pyrolysis temperature
thermal gravity analysis
