Applications of ultrasound for modification of zinc oxide and fabrication of optically active poly(amide-imide)/zinc oxide bionanocomposites

Abstract

This research investigates applying zinc oxide (ZnO) nanoparticles (NPs) as inorganic nanofillers to poly(amide-imide) (PAI) as a polymer matrix via ultrasound technique for the preparation of PAI/ZnO bionanocomposites (BNCs). The surface of ZnO NPs was successfully treated with γ-methacryloxypropyltrimethoxysilane coupling agent (KH570) to decrease the hydrophilicity of NPs. The optically active PAI containing natural L-leucine amino acid was synthesized in a green solvent system which is consisted of tetrabutyl ammonium bromide/triphenyl phosphate. The influences of the ZnO on the structure, morphology, thermal, and optical properties of BNCs were, respectively, characterized by several techniques. All the results indicate that NPs are successfully modified and are compatible with polymer matrix and also proved that there is a homogenous dispersion of ZnO NPs in the polymer matrix in nanoscale.

Morphological and Thermal Properties of Poly(amide-imide)/ZnO Nanocomposites Derived from 4,4′-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) and 3,5-diamino-N-(4-hydroxyphenyl)benzamide

“…Among the semiconducting nanoparticles, zinc oxide (ZnO) has a large excitation binding energy (60 meV) at room temperature [3] and high ultraviolet (UV) absorption, as well as a long life span [11] . The optical properties of pure PAI, modified ZnO and NCs containing 4, 8 and 12 wt.% of ZnO NPs were examined and are shown in Figure 7.…”

“…Nanocomposites (NC)s of organic host polymers and nanoscale inorganic semiconductors have attracted extensive attention due to a wide range of potential applications of these materials [2] . Among the semiconducting nanoparticles, ZnO is one of the II-VI semiconductor materials with band gap 3.37 eV and a large excitation binding energy (60 meV) at room temperature [3] . A large electromechanical coupling in ZnO combined with the low symmetry of the wurtzite crystal structure gives rise to strong piezoelectric and pyroelectric properties [4] .…”

Surface Treatment of ZrO2Nanoparticles with Biosafe Citric Acid and Its Utilization for the Synthesis of L-leucine Based Poly(Amide–Imide) Nanocomposites

“…The obtained suspension was mixed with different amounts of modified ZrO 2 NPs (5, 10 and 15 wt.% of PAI). Then the mixture was irradiated under ultrasonic for 4 h [33] . Due to high local pressure and temperature, which produce by sonication, the modified ZrO 2 NPs could be well dispersed in the PAI matrix.…”

Novel polyvinylpyrrolidone nanocomposites with dispersed poly(amide-imide)/nano-ZrO2 as new nano-filler: morphology, thermal and optical properties

“…DA and the PAI based on sulphonated diamine were synthesized according to our previous works [15,16].…”