High Glass Transition and Optical Transparency of Novel Organosoluble Polyamides Containing 4‐tert‐‐Butyltoluene Moiety

A series of novel polyamides 3a-3d containing 4-tert-butyltoluene moiety, were prepared using the phosphorylation polycondensation technique. FT-IR and (1)H NMR techniques were used to investigate the chemical structures of 3a-3d. The results confirmed that they agreed with the proposed structures for 3a-3d completely. The 3a-3d had inherent viscosities ranging from 0.71 to 1.67 dL.g (1). All the polyamides showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most amide polar solvents. Flexible and tough polyamide films could be prepared by casting from DMAc (N,N-dimethylacetamide) solvent. Their films were nearly colorless and exhibited high optical transparency, with the UV cutoff wavelength in the range of 346-363 nm and transmittance higher than 80% at 450 nm. They also exhibited high glass transition temperatures in the range of 310-343 degrees C and the onset decomposition temperatures in the range of 435-462 degrees C in nitrogen atmosphere. Meanwhile, these polyamide films possess good mechanical properties with tensile strengths of 76.4-86.1 MPa and elongations at break of 11.2%-27.3%. Due to those properties, these polyamides could be considered as photoelectric and microelectronic materials.