A green route for the synthesis of novel optically active poly(amide–imide) nanocomposites containing N-trimellitylimido-l-phenylalanine segments and modified alumina nanoparticles

Abstract

In the present study, novel optically active poly(amide-imide)/alumina nanocomposites (PAI/Al 2 O 3 NCs) containing different amounts of modified -Al 2 O 3 nanoparticles (NPs) were synthesized using the ultrasonic-assisted technique. To improve NPs dispersion and increase the possible interaction between NPs and PAI matrix, the surface of -Al 2 O 3 NP was modified with bioactive diacid coupling agent. The PAI chains were formed from the polycondensation of N-trimellitylimido-L-phenylalanine diacid with 1,5-diamino naphthalene under green conditions. The obtained polymer and inorganic metal oxide NPs were used to prepare chiral PAI/Al 2 O 3 NCs through the ultrasonic irradiation. PAI/Al 2 O 3 NCs were characterized by Fourier transform infrared spectra, x-ray diffraction patterns, field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and ultraviolet-visible (UV-Vis). TGA results confirmed that the heat stability of the prepared NP-reinforced composites was improved compared with the pure polymer. In addition, TEM and FESEM images showed that NPs were dispersed into the polymer matrix at nanoscale.

Recent development in the synthesis of polymer nanocomposites based on nano-alumina

“…Mallakpour and et. al [114,106] The increase of the decomposition thermal was related to the thermal insulation effect of Al 2 O 3 NP and the strong hydrogen bonding between filler and matrix, which protect the PVA matrix and reduce mobility of the PVA chains in these NCs [115,116].…”

Dispersion of surface-modified nano-Fe3O4 with poly(vinyl alcohol) in chiral poly(amide-imide) bearing pyromellitoyl-bis-l-phenylalanine segments

“…From a technological point of view, the use of an organic solvent in large scale preparation is not very friendly, and molten TBAB salt was selected as ionic liquid because it proved to be the most valuable among those employed. Due to their nonvolatility, ionic liquids have a little effect on the environment and human health and so, they are known as green solvents due to their properties such as chemical stability, low-to-high viscosity and high ionic conductivity properties [30][31][32][33][34][35]. Diamine 4 could improve thermal and solubility properties of the final polymer, owing to the aromatic nature of it.…”

“…As part of our continuing efforts in developing tractable chiral macromolecules including natural amino acid [27][28][29][30][31][32][33][34], in this work for the first time, we reported the synthesis of NC materials based on amino acid containing PAI and modified Fe 3 O 4 NPs. In this way, at first, the Fe 3 O 4 NPs were successfully fabricated by the reaction between Fe2 ?…”

Exploration of the role of modified titania nanoparticles with citric acid and vitamin C in improvement of thermal stability, optical property, and mechanical behavior of novel poly(vinyl chloride) nanocomposite films

“…The percentage of the oxygen in the atmosphere is 21%; therefore, materials that have LOI quantities lower than 21% burn easily, however, and materials with higher quantities of LOI lie in the class of self‐extinguishing materials . Therefore, pure PVC and its NCs were considered the self‐extinguishing compounds because of the obtained LOI values.…”