Preparation and properties of magnetic Fe3O4/poly(pyrimidine-amide) nanocomposites: selective polyamidation of a bis(amino-pyrimidine-diol) compound in an ionic liquid

Abstract

This work reports the preparation of magnetic nanocomposites (MNC)s from interfacial reaction between multifunctional poly(pyrimidine-amide)s (PPAs) and epoxide functionalized magnetic Fe₃O₄ nanoparticles. In this regard, organosoluble PPAs were synthesized selectively from polycondensation of bis(2-aminopyrimidine-4,6-diol) compound (DATPhP) with different aromatic and aliphatic dicarboxylic acids in a mixture of ionic liquid(IL)/triphenyl phosphite (TPP) at 110 °C for 2.5 h. The PPAs have weight-average molar mass (M_w) up to 49 500 g mol⁻¹, glass transition temperatures (T_g) up to 240 °C and 10% weight loss temperatures (T_10%) up to 486 °C (in N₂). The results showed that strong chemical bonding between modified Fe₃O₄ nanoparticles and PPA chains reduced solubility and enhanced thermal and mechanical properties of the composites. Also, antibacterial and antioxidant activities of the monomer, PPAs and magnetic nanocomposite poly(pyrimidine-amide) (MNCPPA) were studied.