SYNTHESIS AND CHARACTERIZATION OF NOVEL POLY(AMIDE-IMIDE) NANOCOMPOSITE/SILICATE PARTICLES BASED ON N-PYROMELLITIMIDO-L-PHENYL ALANINE CONTAINING SULFONE MOIETIES

In this work, first N-pyromellitimide-L-phenyl alanine synthesized by reaction of Pyromellitic anhydride with L-phenyl alanine in the presence of acid acetic, and purified. This monomers characterized by FT-IR and 1H-NMR.Then poly(amide-imide) prepared by reaction within N-pyromellitimide-L-phenyl alanine with 4,4'-diamino diphenyl sulfone with direct polymerization method at the presence triphenyle phosphate(TPP), calcium chloride(CaCl2), pyridine(Py) and N-methyle-2-pyrolidon(NMP). The synthesis poly(amide-imide) were characterized by elemental analysis and FT-IR. Two new PAI nanocomposites reinforced by 5% and 10% of organoclay particles were prepared. Then organoclay incorporated to PAI with scanning electron microscopy (SEM), X-ray diffraction (XRD), FT-IR methods. Exploring images of the scanning electron microscopy and the x-ray diffraction have shown that the mixture process of silicate nano particle and polymer matrix has been done well. Also several properties of them such as optical transparency investigated by uv-vis, thermal gravimetric analysis (TGA/DTG) and compared with pure PAI. Moreover, results show that presence of the mineral material lead to the reduction of light passing, and also this reduction has a direct relation with increase of percent of organoclay in the PAI matrix. We also found that adding some clay in polymer lead to increase of the thermal stability. This increment was due to the high thermal stability of mineral particles and the high dipole attraction among mineral layers and polymer chains.