Synthesis and Characterization of Novel Polyamides Containing Purine Moiety

A series of new polyamides (inherent viscosities between 0.61 and 1.84 dL g−1) were prepared directly by low-temperature polycondensation of a new purine-moiety-containing diamines, 7,10-bis(4-aminopheny) adenine, with various acyl dichlorides in N-methyl-2-pyrrolidinone. The resultant polymers showed glass transition temperatures between 312–339°C and 5% weight loss temperatures ranging from 405 to 513 and 378 to 485°C in nitrogen and air atmosphere, respectively. Some polymers were amorphous and could be cast into transparent, light-colored, and flexible films with tensile strengths of 84–110 MPa, elongations at break of 8.4–16.5%, and tensile modulus of 3.3–5.5 GPa.