中文摘要：

以4，40（六氟异丙烯）二酞酸酐（6FDA）为二酐单体，2，2-双（3胺基-4-羟基苯）六氟丙烷为二胺单体，采用“溶液缩聚-亚胺化反应”两步合成法，获得了可溶性聚酰亚胺材料。通过傅里叶变换红外光谱（FTIR）、凝胶色谱（GPC）、热重分析（TGA）、X射线衍射（XRD）等分析测试，考察了原料配比、亚胺化温度、亚胺化时间及催化剂等因素对产物重均分子量等特性参量的影响。结果表明：通过调节合成条件，该聚酰亚胺重均分子量可达4．5×10^4，具有优良的热稳定性，其起始分解温度高于490℃，且在NMP、DMF、DMAc、DMSO、THF、丙酮等有机溶剂中具有优良的溶解性能，能于80℃的低温下亚胺化制得，对材料的大批量制备具有重要意义。

英文摘要：

4,4′-（Hexafluoroisopropylidene）diphthalic anhydride （6FDA） was polymerized with 2, 2 bis （3-amino-4-hydroxyphenyl） hexafluoropropane （BAPAF）. Fluorinated polyimide was obtained via a two- step polycondensaion procedure. The effect of reaction factors like raw materials＇ ratio, imidization tem- perature, imidization time and catalyst on the molecular weight were studied. Polyimide was characterized by FT-IR, GPC, XRD and solubility test. Results showed that polyimide of 6FDA-BAPAF obtained under imidization temperature （80 ℃） had high molecular weight reaching 4.5 ×10^4 , which displayed excellent thermal properties with Td higher than 490 ℃ and had excellent solubility in polar aprotic organic solvents such as NMP, DMF, DMAc, DMSO, THF and acetone.