Abstract

The present investigation reports the preparation and characterization of the thermally stable poly(vinyl alcohol)/(poly(amide-imide)-SiO₂) nanocomposite (PVA/PAI-SiO₂ NC) films. For this reason, the surface of SiO₂ nanoparticles (NPs) was modified with N-trimellitylimido-l-methionine and subsequently, 5 wt.% of modified SiO₂ NPs were dispersed in the PAI matrix via sonochemical reaction. The resulting NC was studied by different techniques.

Abstract

In this work, organic diacid was synthesized from tetrabromophthalic anhydrides and l-aspartic acid in refluxed acetic acid at the presence of pyridine. The interlayer basal spacing of LDH was modified with organic diacid via co-precipitation method using ultrasonic irradiation. The intercalated Mg–Al LDH (mLDH) materials showed an increase in interlayer distance as compared to the unmodified Mg–Al LDH by X-ray diffraction. Transmission electron microscopy images showed plate-like nature for intercalated diacid LDH.

Abstract

In this article, a nanostructure poly(amide–imide) (PAI) was prepared from the polymerization of 4,4′-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) with 3,5-diamino-N-(4-hydroxyphenyl)benzamide using tetra-n-butylammonium bromide as a green media and triphenylphosphite as a condensing agent. This methodology is safe and green since toxic and volatile organic solvents were eliminated. To obtain a homogeneous dispersion of multiwalled carbon nanotubes (MWCNTs) in the PAI matrix, carboxyl-modified MWCNT (CA-MWCNT) was used.

Abstract

In this work, the physicochemical properties of poly(N-vinyl-2-pyrrolidone) (PVP) reinforced with the poly(amide–imide)/alumina nanocomposite (PAN) under sonochemical treatment were studied. In the process of manufacturing PAN, the surface of alumina nanoparticles was grafted with 15 wt% of the bioactive dicarboxylic acid based on amino acid, and an amount of 10 wt% of this modified nanoparticle was loaded into the poly(amide–imide) using some powerful ultrasound irradiation.

Abstract

Novel nanocomposites of chitosan and p-amino phenol functionalized multi-walled carbon nanotubes (chitosan/multi-walled carbon nanotube–p-amino phenol nanocomposites) were synthesized by solution casting method. The resulting chitosan/multi-walled carbon nanotube–p-amino phenol nanocomposites were characterized with Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and thermogravimetric analysis.

Abstract

The present study describes the synthesis and characterization of nanocomposite materials built from the assembly of organic polymer and two-dimensional host materials of organo-modified layered double hydroxide (LDH). Organo-modified LDH was synthesized in one step from the co-precipitation reaction of the Al(NO₃)₃.9H₂O, Mg(NO₃)₂.6H₂O and bioactive N-trimellitylimido-l-methionine under ultrasonic irradiation.

Abstract

Silver nanoparticles capped by poly(vinyl alcohol) (AgNP@PVA) was prepared by reduction of AgNO₃ in aqueous solution of PVA with the help of catalytic amount of tyrosine as reducing agent, under ultrasonic irradiation. Then, AgNP@PVA were embedded into the l-leucine containing poly(amide-imide) (PAI) matrix via sonication technique to prepare a completely green and environmentally friendly PAI/AgNP@PVA nanocomposites (NCs).

Abstract

The present work describes the synthesis and properties of polymer composites based on poly(vinyl pyrrolidone) (PVP) as polymer shell and poly(amide-imide)(PAI)/ZnO nanocomposite (ZNC) as efficient filler. At first, the alanine amino acid containing dicarboxylic acid was grafted on the surface of ZnO NPs. Then, modified ZnO (12 wt%) was incorporated into the PAI matrix under ultrasonic irradiations. The obtained hybrid ZNC showed high thermal stability and the size of the NPs in the TEM image of ZNC was about 31 nm.

Abstract: A simple and efficient method was presented for chemical functionalization of multi-walled carbon nanotubes (MWCNTs) with vitamin B₁. Poly(ester-imide) (PEI) based nanocomposites were prepared by the incorporation of different amounts of modified MWCNTs (5, 10, 15 wt%) into a chiral and biodegradable PEI by solution blending and ultrasonic dispersion methods. The chiral PEI was produced by a step-growth polymerization of chiral diacid with 4,4'-thiobis(2-tert-butyl-5-methylphenol).

Abstract

We have reported the synthesis of nanocomposites (NCs) based on chiral poly(amide-imide) (PAI) and modified zirconium nanoparticles (ZrO₂ NPs) with poly(vinyl alcohol) (PVA). The optically active PAI was prepared under the green condition via the direct polycondensation of biocompatible trimellitylimido-l-leucine diacid and 4,4′-diaminediphenylsulfone in the presence of tetrabutylammonium bromide and triphenyl phosphite as the green solvent and the activating agents.