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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 compiled by solvothermal method. Substituted, 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. , 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 ~ 20 μm membranes.