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°C and the onset decomposition temperatures in the range of 435–462°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.