Effect of modified ZnO capped withN-trimellitylimido-L-alanine diacid as an optically active coupling agent on the morphology and thermal properties of poly (amide-imide)/ZnO nanocomposites

Abstract

In this study, the poly(amide-imide) (PAI)/ZnO nanocomposites (NC) were prepared by means of ultrasonic irradiation. For this purpose, at first, surface of ZnO NPs was modified with N-trimellitylimido-L-alanine diacid as a new capping agent which has features such as nontoxicity, optical activity, and environmentally friendly. Then, the PAI was synthesized by the utilizing of tetra-n-butylammonium bromide and triphenyl phosphite as a condensing agent and green media. This method suggests simple, high-yield (>90%) polymerization reaction with green aspects using ionic liquid. Then, modified ZnO NPs were incorporated into the PAI matrix for the preparation of NCs. The obtained NCs were characterized by several techniques. Field emission scanning electron microscopy and transmission electron microscopy analyses of the NCs were accomplished to study the dispersion of fillers in the polymer matrix and demonstrated a rather good amount of dispersion. According to the thermogravimetric analysis results, the addition of ZnO NPs enhanced thermal stability of the obtained NCs.

The thermal, optical, flame retardant, and morphological consequence of embedding diacid‐capped ZnO into the recycled PET matrix

“…The presence of OAH on the surface of ZnO NPs is revealed by broad band at 3500 cm 21 and a broad peak at 432 cm 21 depicture the ZnAO bond stretching [ Figure 1(a)]. 22,25 There are some characteristic absorption bands related to the imide heterocyclic ring in the spectrum of DA [ Figure 1 for hydroxyl end groups and 3430 cm 21 related to CAO overton. 28 There are two peaks at 3055 and 2965 cm 21 due to CAH bond asymmetric stretching (methylene groups).…”

“…25 As can be seen from Scheme 2, the existence of the polar groups of DA such as NH 2 and ACOOH has been considered as the main factor that can bind to remaining AOH groups on the surface of ZnO NPs. 26 Recycled PET, with the different functional groups, was used as a polymeric matrix material for the NCs preparation.…”

“…Surface modification of ZnO NPs was carried out with DA under ultrasonic irradiation conditions. 25 Firstly; 0.015 g of DA (15 wt % with respect to the ZnO) was added to the mixture of 0.10 g of ZnO NPs that was suspended in absolute methanol. The combination was stirred at room temperature for 24 h and ultrasonicated for 30 min to obtain ZnO/DA (Scheme 2).…”

“…In other earlier reports, the effect of incorporation of DAs based on amino acids into the different types of polymeric structure was examined and results displayed that the synthetic materials from these DAs were biocompatible, biodegradable, and nontoxic. 24,25 So from biological point of view, it can be concluded that bioactive DAs are the suitable selection for the modification of safe ZnO NPs.…”

“…25 Then a facile and simple approach for the manufacturing of novel PET@ZnO/DA NCs is described. The surface modification of ZnO and effects of modified NPs on the properties of the obtained NCs were investigated and characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and X-ray diffraction (XRD) and UV-vis spectroscopy.…”