1

2

3

4-tetrachlorotriptycene was synthesized by Diels-Alder reaction using tetrachlorophthalic acid and anthracene.Then by nitration and reduction of 1

2

3

4-tetrachlorotriptycene

2

6-diamino-13

14

15

16-tetrachloro triptycene diamine monomer was prepared.Novel triptycene polyimides were synthesized via a two step polycondensation by 2

6-diamino-13

14

15

16-tetrachloro triptycene diamine and bisphenol A dianhydride and hexafluoro dianhydride and 3

3'

4

4'-benzophenone tetracarboxylic dianhydride.The structure of 2

6-diamino-13

14

15

16-tetrachloro triptycene diamine monomer was characterized by 1H-NMR

13C-NMR and FTIR.The structure of polyimides were characterized by 1H-NMR

FTIR

the properties of the polymers were investigated by solubility

thermal properties

inherent viscosity and BET.The results showed that polyimides containing the tetrachlorotriptycene structure had good solubility

polymers could be dissolved in common organic solvents

such as DMAc

DMF

NMP

THF

pyridine and m-cresol.In particular

polyimides based on bisphenol A dianhydride and hexafluoro dianhydride were easily dissolved in chloroform at room temperature.These polyimides had excellent thermal properties

the glass transition temperature of the polymers was not found between 0~300 ℃ and the 10% weight loss temperatures of these three polyimides were all above 500 ℃.The three polymimides also had good film forming properties giving light transparent films

wherein the polyimide films based on bisphenol A dianhydride were colorless transparent.The polyimide based on hexafluoro dianhydride with BET specific surface area of 370 m2/g was a novel porous polymer.