一种高可溶、高光学透明含氟聚酰亚胺的合成与表征

由自制芳香二胺单体9,9-双(3,5-二氟-4-胺基苯基)芴和商品化二酐单体4,4'-(六氟异丙基)双邻苯二甲酸酐经一步法高温缩聚制备了一种新型含氟聚酰亚胺.分别用FT-IR、1HNMR和19FNMR对所制聚酰亚胺结构进行了表征.结果证实其与所设计的结构完全一致,并且酰亚胺化反应完全.该含氟聚酰亚胺表现出高的溶解性:室温下在N-甲基-2-吡咯烷酮、N,N-二甲基乙酰胺、N,N-二甲基甲酰胺、氯仿、二氯甲烷、四氢呋喃等常规溶剂中的溶解度可达10wt%以上.由该聚酰亚胺溶液所制的薄膜无色透明,截断波长在315nm,400nm波长后的透光率在84%以上.此外该含氟聚酰亚胺还表现出良好的热学性能和机械性能:玻璃化转变温度在377℃,空气和氮气中10%热失重温度均在539℃以上;其薄膜的拉伸强度在70～80MPa,断裂伸长率在4%～8%,起始模量为2.6GPa.

Synthesis and Characterization of Fluorinated Polyimide with High Solubility and Optical Transparency

A novel fluorinated polyimide(PI 3) containing fluorenylene cardo structure, was prepared from 9,9-bis(4-amino-3,5-difluorophenyl)fluorene(1) and 4,4'-(2,2-hexafluoropropylene)bis(phthalic anhydride)(2) via a one-step high-temperature polycondensation.FT-IR, 1H and 19F NMR spectra were used to investigate the chemical structure of PI 3.The results confirmed that the structure of PI 3 was in good agreement with the proposed structure and the imidization was conducted completely between 1 and 2.The obtained P...