Simple and efficient microwave-assisted polycondensation for preparation of chiral poly(amideimide)s having pendant phenol moiety.
Chiral bisaminoacids were synthesized by interaction of pyromellitic dianhydride with different aminoacids (phenylalanine, leucine, isoleucine, valline and alanine) in boiling glacial AcOH. Polycondensation of prepared bisaminoacids with aromatic diamine, containing pendant hydroxyl-groups, was carried out in molten tetrabutylammonium bromide under action of microwave irradiation. With yields 88–96% were prepared optically active polyamidoimides (PAIs), having inherent viscosities from 0.30 to 0.58 dL/g (0.5% solution in DMF, 25°C) and [α] 589 25 = −28...−48 deg. As shown X-ray diffraction and emission scanning electron microscopy, PAIs are nanostructured and amorphous polymers.