【摘要】 通过分子设计合成了异丁基桥联2-叔丁基苯胺的新型二胺单体4,4′-（2-异丁基）双（2-叔丁基苯胺）,并将其分别与4种商品化芳香族二酐经高温"一步法"缩聚制得了系列聚酰亚胺（PI）树脂.采用多种测试手段研究PI的结构和性能,结果表明,该系列新型聚酰亚胺不但可溶于N-甲基吡咯烷酮及N,N-二甲基甲酰胺等高沸点溶剂,而且在乙酸乙酯和三氯甲烷等低沸点溶剂中也具有良好的溶解性.该系列PI保持了良好的热稳定性,在N₂中5%热失重温度均在480℃以上,玻璃化转变温度（T_g）介于307～356℃之间.经溶液刮涂制得的PI薄膜具有良好的光学透明性,在可见光区平均透过率可达82.3%～89.1%,截止波长介于313～363 nm之间.同时,该系列PI薄膜还具有良好的机械性能和疏水性,有望应用于光伏发电及柔性显示等领域.更多还原

【Abstract】 A novel diamine containing tert-butyl and isobutyl groups{4,4′-（2-isobutyl）bis[2-（tert-butyl）aniline],IBBTBA}was synthesized from 2-tert-butyl aniline and isobutyraldehyde.Then a series of polyimides（PIs）was prepared from IBBTBA and four aromatic dianhydrides by the high-temperature one-plot polymeriza-tion.The structure and properties of the PIs were investigated in detail.The results indicate that all PIs show good solubility not only in high-boiling aprotic solvents[N-methylpyrrolidone（NMP）,N,N-dimethylacetamide（DMAc）,etc.],but also in low boiling point solvents[ethyl acetate（EA）,CHCl₃,etc.].They can be processed into flexible films easily by the solution casting or blade coating.All the resulting PI films（around25μm in thickness）have good transparency with the average transmittance from 82.3%to 89.1%and the cut-off wavelength from 313 nm to 363 nm in the visible light region.Satisfactorily,all PIs still maintain the good thermal stability.Their 5%mass loss temperatures（in N₂）are above 480℃and T_gvalues are in the range from 307℃to 356℃.Besides,all PIs films exhibit good mechanical properties and hydrophobicity.In sum-mary,these PI films are potential candidates for applications in the fields of photovoltaic power generation,flexible display and so on.更多还原