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, PIa, 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 similar to 85% at 450 nm as similar to 20 mu m membranes. (C) 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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