Li Fu, Liu Jikang, Liu Xiangfu, Wang Yao, Gao Xiang, Meng Xianggao, Tu Guoli
Wuhan National Research Center for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 403052, China.
Polymers (Basel). 2018 May 18;10(5):546. doi: 10.3390/polym10050546.
A novel rigid semi-alicyclic dianhydride 9,10-difluoro-9,10-bis(trifluoromethyl)-9,10-dihydroanthracene-2,3,6,7-tetracarboxylic acid dianhydride (8FDA) was reported, and its single crystal X-ray diffraction result revealed the existence of the polymorphic structure in this compound. The detail geometric configuration transition during the synthesized process was investigated, exhibiting a transition of from - to - when the hydroxyl groups were substituted by fluoride with diethylaminosulfur trifluoride (DAST). Compared with the dianhydride 4,4'-(Hexaflouroisopropylidene) diphthalic anhydride (6FDA) and 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA), the resulting polyimide (PI) films based on 8FDA exhibited an obviously higher glass transition temperature (, 401 °C) and a much lower coefficient of thermal expansion (CTE, 14 ppm K). This indicates that 8FDA is an ideal building block in high-performance soluble PIs with low CTE.
报道了一种新型刚性半脂环族二酐9,10-二氟-9,10-双（三氟甲基）-9,10-二氢蒽-2,3,6,7-四羧酸二酐（8FDA），其单晶X射线衍射结果表明该化合物存在多晶型结构。研究了合成过程中详细的几何构型转变，当用三氟乙胺基硫（DAST）将羟基被氟取代时，显示出从-到-的转变。与二酐4,4'-（六氟亚异丙基）二邻苯二甲酸酐（6FDA）和1,2,4,5-环己烷四羧酸二酐（HPMDA）相比，基于8FDA制备的聚酰亚胺（PI）薄膜表现出明显更高的玻璃化转变温度（，401℃）和更低的热膨胀系数（CTE，14 ppm K）。这表明8FDA是具有低CTE的高性能可溶性聚酰亚胺中的理想结构单元。
