四甲基二甲酰型芳环化合物的合成

The Synthesis of Di-Methylbenzoyl Phenyl Compounds

双酮酐型聚酰亚胺(PI)具有优异的耐热性能及力学性能,制备此类型聚酰亚胺的重要单体之一是多烷基化合物.通过低温Friedel-Crafts酰基化反应制备1,4-二(3',4'-二甲基苯甲酰基)苯、1,3-二(3',4'-二甲基苯甲酰基)苯、4,4'-二(3',4'-二甲基苯甲酰基)二苯醚、4,4'-二(3',4'-二甲基苯甲酰基)联苯4种四甲基二甲酰型芳环化合物,并且分别对4种化合物的结构进行了红外和核磁分析.结果表明:所得4种化合物与目标产物一致,有望拓展双酮型二酐的种类,进而合成性能更佳的新型双酮酐型聚酰亚胺.

Di-ketone dianhydride polyimides have excellent thermal stability and good mechanical properties in high temperature. Design and synthesis the novel alkyl anhydride is important to the industry of polyimides. 1, 4 - d i （ 3 ＇, 4 ’ -dimethybenzoyl） benzene, 1,3 -di （ 3＇,4 ’ -dimethybenzoyl） benzene, 4,4 -di （ 3＇,4 ’ -dimethybenzoyl） diphenyl ether and 4,4-di（3; dimethybenzoyl） biphenyl are prepared by Friedel-Crafts acylation in this work and are character-ized by FT-IR and 1H NMR. The results show that the structures of four compounds are target compounds. Novel high performance polyimide with di-ketone anhydride groups can be synthesized by these alkyl dianhydrides.