ИСТИНА

In this work, linear and star-shaped oligoimides were synthesized according to the Bn + AB scheme using a polycondensation in a benzoic acid melt, where Bn are aromatic amines with the different number of amine groups (n = 1,2,3 and 4), AB - 3-aminophenoxyphthalic acid (APPA). Also, during the polycondensation of AB monomers, along with the formation of the main products, the formation of cycles occurs. In this work, the effect of loading AB monomer on cyclization was studied, and the first steps were taken to study the mechanism of formation of cycles. All obtained oligoimides were investigated by IR, 1H NMR spectroscopy, as well as by the SEC method with triple detection (RI, MALLS and viscosimetry). The process of cyclization by monomer APPA was investigated in more detail using the MALDI ToF method.