摘要
A novel triptycene-based dianhyride as a shape-persistent building block with high internal free volume was conveniently synthesized via solvothermal method.Subsequently,three all-aromatic polyimides,Pla,PIb and PIc,were prepared by a one-step polycondensation of triptycene-2,3,6,7-tetracarboxylic dianhydride with 2,2＇-bis（trifluoromethyl）benzidine,m-tolidine and 3,3＇,5,5＇-tetramethylbenzidine,respectively.The corresponding polymers exhibit good solubility,excellent thermal stability,significant microporosity with large BET surface areas of up to 623 m^-2 g^-1 as well as an unexpected optical property with a transmittance of -85%at 450 nm as -20μm membranes.
A novel triptycene-based dianhyride as a shape-persistent building block with high internal free volume was conveniently synthesized via solvothermal method.Subsequently,three all-aromatic polyimides,Pla,PIb and PIc,were prepared by a one-step polycondensation of triptycene-2,3,6,7-tetracarboxylic dianhydride with 2,2＇-bis（trifluoromethyl）benzidine,m-tolidine and 3,3＇,5,5＇-tetramethylbenzidine,respectively.The corresponding polymers exhibit good solubility,excellent thermal stability,significant microporosity with large BET surface areas of up to 623 m^-2 g^-1 as well as an unexpected optical property with a transmittance of -85%at 450 nm as -20μm membranes.
基金
the National Natural Science Foundation of China(No.51473055)for financial support
