Effect of silane-modified ZnO on morphology and properties of bionanocomposites based on poly(ester-amide) containing tyrosine linkages

Abstract

In this study, various optically active poly(ester-amide)/Zinc oxide bionanocomposites (PEA/ZnO BNCs) were synthesized with different amount of modified ZnO nanoparticles using ultrasonic irradiation. To obtain the homogeneous distribution of ZnO in polymer matrix, the surface of nanoparticles was modified to organophile with c-aminopropyltriethoxyl silane. PEA/ZnO BNCs were characterized by Fourier transform infrared spectra, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The FE-SEM, AFM, and TEM results confirmed that the nanoparticles were dispersed uniformly in PEA matrix at the nanoscale. In addition, thermogravimetric analysis data indicated an improvement of thermal stability of novel BNC materials as compared to the pure polymer.

Elaboration and characterization of a multifunctional silane/ZnO hybrid nanocomposite coating

“…Finally, the broad band around 3258 cm -1 can be attributed to the N-H functions. These values are consistent with the literature [16]. The appearance of these bands shows that the coupling agent is grafted on the surface of ZnO nanoparticles.…”

“…As already aforementioned, a key-step of the process is to finely disperse the nanoparticles in order to obtain a good stability both in the solvent and in the matrix. Mainly two techniques are approached to improve the nanofiller dispersion: the use of ultrasound [15] and the nanoparticle surface functionalization [16]. Interestingly, Chung et al [15] highlighted the effectiveness of ultrasonic treatment on the dispersion of ZnO, but a dispersion step using adequately selected dispersant still appears necessary for maintaining a good level of stability over time and avoiding re-aggregation of the nanoparticles.…”

The Special Modifiers Containing N-Trimellitylimido-L-Amino Acids for the Surface Modification of Nano ZrO2

“…They have two different functional groups, one side is bonded to the surface of inorganic NP and the other side is compatible with polymer matrix. [17] In this work, a kind of dicarboxylic acid was used as coupling agent. Five different amino acids as substitution into backbones of dicarboxylic acid, give special properties to these coupling agents.…”

The effects of water absorption and surface treatment on mechanical properties of epoxy nanocomposite using response surface methodology

“…The amounts of materials in the reaction vessel are used from Ref. [18]. An ultrasonic homogenizer is used for all samples at 19,000 rpm for 15 min to disperse nanoparticles in the solvent.…”

“…Fine particle size and high specific surface area make the fumed silica the most popular reinforced filler for composites [16]; in spite of their low cost, they have various applications, but the viscosity will be increased by formation of hydrogen bonds between the particles leading to the formation of a threedimensional network in the matrix [17]. Increasing the affinity of the particle surface to the matrix polymer leads to reduced conglomeration behavior [18]. The surface treatment of the particles with organic molecules enhances compatibility and adhesion between the components [19].…”