Construction and Characterization of Bionanocomposites Based on Optically Active Poly(Ester-Imide) Containing L-Amino Acids Using Nano-ZnO Surface-Coupled by γ-Methacryloxypropyl-Trimethoxysilane

Abstract

In this paper, we investigated the synthesis of an optically active poly(ester-imide) containing two aminoacid residues in the main chain. This macromolecule was synthesized by polycondensation of N,N -(pyromellitoyl)-bis-L-tyrosine dimethyl ester as a diphenolic monomer and a chiral trimellitic anhydridederived diacid monomer containing L-methionine. The direct step-growth polymerization of this diacid with aromatic diol was carried out in a system of tosyl chloride (TsCl), pyridine (Py) and N,Ndimethylformamide (DMF) as a condensing agent. The obtained polymer has a useful level of thermal stability. Thereafter, the surface of zinc oxide nanoparticles (ZnO-NPs) was treated with a silane coupling agent, γ -methacryloxypropyltrimethoxysilane (KH570), which introduces functional groups on the surface of ZnO-NPs. Then, PEI/zinc oxide bionanocomposites (PEI/ZnO BNCs) containing 4, 8 and 12% of NPs were successfully prepared by an ultrasonic method as a simple and inexpensive route. In modified ZnONPs, the organic chains of KH570 can fulfill strict hindrance between inorganic NPs and prevent their aggregation. The obtained polymer BNCs were characterized by FT-IR, XRD, FE-SEM, TEM and TGA. The FT-IR spectroscopy indicated that the silane coupling agent was anchored on the surface of ZnO-NPs. Direct proof for the formation of the true polymer BNCs was provided by TEM investigation. Also, a morphology study of the synthesized polymer BNCs using FE-SEM analysis showed well-dispersed ZnO-NPs in the polymer matrix. TGA confirmed that the heat stability of the polymer BNCs was enhanced in the existence of modified nanostructure ZnO particles.

The nanocomposites of zinc oxide/L‐amino acid‐based chiral poly(ester‐imide) via an ultrasonic route: Synthesis, characterization, and thermal properties

“…In comparison with nanocomposite containing functionalized ZnO‐NPs by γ‐methacryloxypropyltrimethoxysilane (KH570) as a silane coupling agent, the TEM micrographs of obtained BNCs showed that NPs were uniformly dispersed in the PEI matrix. It has been recognized that the organic nature of coupling agent as a surface modifier is a key factor to promote the dispersion of the NPs in the polymer matrix 48…”

Studies on Preparation and Microstructure Characterization of Novel Composites Based on Functionalized Multiwalled Carbon Nanotubes and Chiral Poly(ester-imide) Containing S-Valine Linkages

“…Poly(ester-imide)s (PEI)s have received considerable interest for their good heat resistance, mechanical properties, electrical insulation, chemical resistance and low melting viscosity [27][28][29] . These are widely used in electronic devices, membranes, adhesives, printed circuit boards, and engineering thermoplastics [30][31][32][33] .…”

Chemical surface coating of MWCNTs with riboflavin and its application for the production of poly(ester‐imide)/MWCNTs composites containing 4,4′‐thiobis(2‐tert‐butyl‐5‐methylphenol) linkages: Thermal and morphological properties

“…Poly(ester‐imide)s (PEI)s inherit desirable characteristics from both polyesters and polyimides. This class of polymers shows high thermal stability, good mechanical properties, facile processing, and electrical insulation . These properties have made them suitable for different applications in printed circuit boards, engineering thermoplastics, electronic devices, membranes, and adhesives .…”