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

Abstract

In this investigation, a chiral poly) ester‐imide) (PEI) via direct polyesterification of N,N′‐(pyromellitoyl)‐bis‐(L‐tyrosine dimethyl ester) and N‐trimellitylimido‐L‐methionine was prepared using the tosyl chloride/pyridine/N,N′‐dimethylformamide system as a condensing agent. This approach allows the insertion of two natural amino acids into the polymer backbone and the creation of a bioactive polymer. From the chemical point of view, the ester groups impart to the polymer's main and side chain increased sensibility to hydrolysis that can cause chain breaking. Therefore, this polymer is expected to be biodegradable and could be classified as an eco‐friendly polymer. The polymer also had a useful level of thermal stability associated with excellent solubility. PEI/zinc oxide bionanocomposites were subsequently prepared by an ultrasonic method as a simple and inexpensive route, using ZnO nanoparticles (ZnO‐NPs) modified by 3‐aminopropyltriethoxylsilane (KH550) as a coupling agent. The structure and properties of the obtained BNC polymers were confirmed by Fourier transform infrared spectroscopy, X‐ray diffraction, field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The direct proofs for the formation of the true BNC polymers were provided by TEM. Also, the morphology study of the synthesized polymer‐based BNCs showed well‐dispersed ZnO‐NPs in the polymer matrix by FE‐SEM analysis. TGA studies indicated that an increase of the NP content led to an enhancement of the thermal stability of the new BNC polymers. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Preparation and characterization of surface‐modified ammonium polyphosphate and its effect on the flame retardancy of rigid polyurethane foam

“…23,24 In addition to the disappearance of PACl, a new NAH peak (at 3451 cm 21 ) formed after the reactions between NH 2 and PACl to produce a PANAH linkage. 28,29 According to these results, the functional surfacemodification agent was successfully synthesized. The absorption peaks at about 1224 and 860 cm 21 were assigned to the P@N and PAN stretching vibrations of HCCP.…”

“…27 The absorption peaks at about 2980-2850 cm 21 were attributed to the stretching and bending vibrations of the CAH group of KH-550. 28,29 According to these results, the functional surfacemodification agent was successfully synthesized.…”

Nanostructured ZnO Materials: Synthesis, Properties and Applications

“…Zinc oxide nanoparticles were used as reinforcement fillers for improving the structural properties of a wide range of polymers such as rubber [159], PP [160], PET [161], epoxy resin [162,163], PMMA [164], polysulfone [165] and many others [166][167][168][169][170]. Also nanocomposites based on renewable sources were studied [171].…”

Composites of Semiaromatic Poly(Amide-Ester-Imide) Based on Bioactive Diacid and Oragnomodified Nanoclay Produced by Solution Intercalation Method: Thermal and Morphological Study

“…According to our previous work in the field of polymers NCs [34][35][36] , in this study we present a new method to prepare the PAEI/organomodified MMT (OMMT) NCs through the solution intercalation method. Thermal properties of the PAEI/ 542 S. MALLAKPOUR AND M. KHANI OMMT NCs are determined by thermogravimetric analysis (TGA), whereas the quality of dispersion of nanoclay is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM) analysis.…”