Preparation and Properties of Polyimides Containing 1,2,3-Triazole Moieties

A new diamine containing 1,2,3-triazole ring was synthesized by the click reaction in the presence of Cu (I) catalyst. A series of novel polytriazoleimides (PTAIs) were synthesized using the prepared diamine by the conventional two-step thermal or chemical imidization method with commercially available aromatic dianhydrides. The chemical structure of the monomers and polymers was characterized by Fourier transform Infrared, H-1 nuclear magnetic resonance (NMR), and C-13 NMR spectral analysis. Solubility of the PTAIs was tested in various organic solvents. The glass transition temperatures of these PTAIs are in the range of 215-254 degrees C. PTAIs exhibit low dielectric constant of 3.04-3.34 at 1 MHz, high thermal stability, and temperature corresponding to 5% (T-5%) weight loss is in the range of 442-492 degrees C. The flame retardance values (limiting oxygen index) are in the range of 38.4-40.5. The PTAI films exhibited good mechanical properties with tensile strength of 96.2-98.9 MPa, elongation to break of 9.8-12.6%, and tensile modulus of 2.5-3.1 GPa.