Poly(amide-imide)s (PAI)s as engineering materials have received more attention owing to their high thermal and chemical stability. Therefore, organic/ inorganic nanocomposite (NC) of these materials has been widely studied in the last few decades. Here, we present PAI-NCs preparation containing surface modified TiO2 nanoparticles (NP)s by employing silane coupling agent under ultrasonic process. Optically active nanostructure PAI was prepared from 5-(2-benzimidazole)-1,3-phenylenediamine (4) and chiral diacid monomer N-trimellitylimido-L-leucine (5) using molten salt tetrabuthylammonium bromide as an activating medium. A considerable improvement of properties can be achieved by inserting NPs into the polymer matrix. The results of field emission scanning electron microscopy and transmission electron microscopy indicated that there is a little aggregation of a large quantity of particles. Thermogravimetric analysis confirmed that the heat stability of the polymer NCs in the temperature range of 400-800 °C was enhanced.

Líquidos iônicos (ILs) baseados em 1,3-dialquilimidazólio e amônea têm sido usados como meio de reação eficiente para amidação de diversos ácidos carboxílicos com isocianatos. Esse método tem larga aplicação e o procedimento é suave e eficiente quando comparado aos métodos existentes, baseados em solventes convencionais. O "projeto" adequado do (ILs) permite a obtenção de amidas com resultados de bom a excelente. Nessa reação, tanto pode ser usado um isocianato aromático, quanto um alifático.

Ionic liquids (ILs) based on 1,3-dialkylimidazolium and ammonium have been used as an efficient reaction media in the amidation of several carboxylic acids with isocyanates. The method has wide applicability, and the protocol is mild and efficient compared to the existing methods based on conventional solvents. Proper 'design' of the ILs allows us to obtain amides in good to excellent yields. In this reaction, both aromatic and aliphatic isocyanates could be used.