硝酸在改性氟塑料内囊内的渗漏行为  

Permeability investigation of nitric acid in a tetrafluoroethylene-hexafluoropropylene (F46) container

作　　者：龚朝阳[1,2] 程璇[1,2] 张颖[1,2] 郭亚涤[1] 

机构地区：[1]厦门大学材料学院材料科学与工程系,福建省厦门市361005 [2]福建省特种先进材料重点实验室,福建省厦门市361005

出　　处：《合成树脂及塑料》2016年第1期41-43,共3页China Synthetic Resin and Plastics

摘　　要：推进剂在改性氟塑料聚全氟代乙丙烯(F46)内囊内的渗漏不可避免,通过设计特定的装置,用浓硝酸替代推进剂,利用离子色谱检测存放不同时间后渗透出内囊的硝酸根离子的含量来评价内囊的防渗透性能,采用扫描电子显微镜对改性氟塑料膜的内表面进行表征。研究发现,随着浸泡时间的增加,硝酸根离子的渗透速率减慢并趋于平稳,由最初的每天约8μg/g下降到最后的约1μg/g。氟塑料内囊的内壁表面被腐蚀,腐蚀物堵塞了自由体之间的间隙,从而导致硝酸渗透速度的降低。It is inevitable for possible permeation of corrosive chemical substances stored in a tetrafluoroethylene-hexafluoropropylene（F46） container due to the spaces between the chain segments of F46. A specially designed device was used in this paper to investigate the permeability of nitric acid which was a substitute of corrosive chemical substance in an F46 container. An ion chromatogram（IC） was employed to examine the permeability of the container by detecting the changes in concentrations of nitrate ions during different periods of F46 membrane immersion in ultra-pure water. Surface morphologies of F46 membrane before and after the immersion were studied by scanning electron microscopy（SEM）. It is found that the permeable rate of nitrate ions is slow down and is virtually unchanged as the immersion time increase. The inside surface of F46 membrane corroded appreciably, which reduces the permeability velocity acid.

关 键 词：聚全氟代乙丙烯 渗透 离子色谱 硝酸根离子 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]