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利用聚酰胺酸(PAA)在研磨过程形成炭黑(CB)的“impurity-free”分散剂制备纳米CB填充聚酰亚胺(PI)高性能复合薄膜.球磨CB和PAA/N-甲基-2-吡咯烷酮(NMP)溶液的混合液,PAA在研磨过程中降解形成活性分子,原位生成与CB表面具有反应活性和强烈物理吸附能力的“impurity-free”分散剂.拉曼、红外以及紫外-可见光吸收光谱证实了降解PAA分子对CB的改性作用.经改性的CB与PAA溶液共混,涂覆固化制备PI/CB复合薄膜.TEM照片表明该分散剂可以显著促进CB粒子在PI基体中的均匀分散,分散粒径约为200nm.力学性能测试和导电性能测试表明PI/CB复合薄膜的断裂伸长率大幅提高,电阻率(ρ)重复性浮动范围从2个数量级降到1个数量级.进一步研究发现,研磨过程中添加高分子量PAA更有利于CB在PI基体中的均匀分散.
Nano-CB filled polyimide (PI) high-performance composite films were prepared by polyacryl acid (PAA) forming an impurity-free dispersant of carbon black (CB) during milling.Mg and PAA / 2-pyrrolidone (NMP) solution, the PAA degrades during milling to form active molecules and generates in situ “impurity-free” dispersants with reactivity and strong physical adsorption capacity on the CB surface. , Infrared and UV-visible absorption spectroscopy confirmed the degradation of PAA molecules on CB modified CB modified with PAA solution, coated and cured to prepare PI / CB composite film.TEM photos show that the dispersant can significantly promote CB particles dispersed uniformly in PI matrix with a dispersed diameter of about 200nm.Mechanical properties and electrical conductivity tests show that the elongation at break of PI / CB composite films increases sharply and the resistivity (ρ) repeatability fluctuates from 2 The order of magnitude dropped to one order of magnitude.Further study found that adding high molecular weight PAA in the grinding process is more conducive to the uniform distribution of CB in the PI matrix.