| Abstract: | ![]()
A new cardo diamine monomer, 1,1‐bis[4‐(4‐aminophenoxy)phenyl]‐4‐tert‐butylcyclohexane containing tert‐butylcyclohexylidene units was prepared in three steps from 4‐tert‐butylcyclohexanone. The monomer was reacted with various aromatic dicarboxylic acids and tetracarboxylic dianhydrides to produce polyamides and polyimides, respectively. All the polymers, characterized by X‐ray diffraction, are amorphous. These cardo polymers exhibit good solubility in a variety of solvents. Almost all polymers are soluble in N‐methyl‐2‐pyrrolidone (NMP), N,N‐dimethylacetamide (DMAc), N,N‐dimethylformamide (DMF), dimethyl sulfoxide (DMSO), pyridine, and even in tetrahydrofuran (THF) and cyclohexanone. The polymers show glass transition temperatures between 244–310°C and decomposition temperatures at 10% mass loss ranging from 486–526°C in nitrogen. The tough and flexible polymer films have tensile strength of 77–137 MPa, elongations at break of 5–14%, and tensile moduli of 2.0–2.6 GPa. |
