Chemical adsorption of D-sucrose on MWCNTs for compatibility improvement with alanine-based poly(amide-imide) matrix: morphology examination and thermal stability study

Abstract

A simple and fast method has been developed for the covalently functionalized multi-walled carbon nanotubes (MWCNTs) with d-sucrose carbohydrate (MWCNT-Suc) in an aqueous solution. Fourier transform infrared technique confirmed the ester linkage between the MWCNTs and sucrose. Good water solubilization of MWCNTs was obtained. Nanotube-reinforced poly(amide-imide) (PAI) nanocomposites (NCs) were prepared by mixing MWCNT-Suc with alanine amino acid-based PAI matrix.

A Benign and Simple Strategy for Surface Modification of Al2O3 Nanoparticles with Citric Acid and L(+)-Ascorbic Acid and Its Application for the Preparation of Novel Poly(vinyl chloride) Nanocomposite Films

ABSTRACT

In this research, the preparation of nanocomposites (NCs) containing nonaggregated nanoparticles (NPs) was studied. Alumina NPs were functionalized by two coupling agents, citric acid and ascorbic acid. NCs of poly(vinyl chloride) (PVC) doped with varying amounts of modified Al2O3 NPs were synthesized via the ultrasonication method. The X‐ray diffraction confirmed that the structure of the modified Al2O3 NPs was still preserved in a pure crystalline phase with the hexagonal structure.

Improved solubilization of multiwalled carbon nanotubes (MWCNTs) in water by surface functionalization with d-glucose and d-fructose: Properties comparison of functionalized MWCNTs/alanine-based poly(amide–imide) nanocomposites

Abstract

Carbon nanotubes (CNTs) are difficult to be dispersed into a polymer matrix. For effective reinforcement, the strong interfacial interaction between nanotubes and the matrix is essential to donate the efficient thermal transfer from the matrix to nanotubes. In this study, multiwalled carbon nanotubes (MWCNTs) were modified with glucose and fructose carbohydrates as biomolecules to obtain Gl-MWCNTs and Fr-MWCNTs. Good water solubilization of MWCNTs was obtained, and these hybrids were expected to be biocompatible.

Novel poly(N-vinyl-2-pyrrolidone) nanocomposites containing poly(amide–imide)/aluminum oxide nanostructure hybrid as a filler

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.

Surface treatment of copper (II) oxide nanoparticles using citric acid and ascorbic acid as biocompatible molecules and their utilization for the preparation of poly(vinyl chloride) novel nanocomposite films

Abstract

In the present study, solution casting method was used for the preparation of nanocomposite films. Primarily, the surface of copper (II) oxide (CuO) nanoparticles was modified with biosafe molecules such as citric acid and ascorbic acid for better dispersion in the polymer matrix. Then novel nanocomposite films were fabricated by loading various percentages of modified CuO nanoparticles in the poly(vinyl chloride) matrix. The ultraviolet (UV)-blocking effects of nanocomposites and their optical properties were studied using UV-visible spectroscopy.

The fabrication and characterization of nanocomposites containing new poly(amide–imide) based on 4,4-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) and carboxylic acid-functionalized multiwalled carbon nanotubes

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.

Production of polyvinylpyrrolidone/chiral diacid modified nanocrystalline Mg-substituted fluorapatite nanocomposites: Morphological and thermal characterization

Abstract

The main objective of this work was the production of novel polyvinylpyrrolidone/diacid modified Mg-substituted fluorapatite (DM-MFA) nanocomposites (NC)s, by sonication process. Mg-substituted fluorapatite (MFA) powders with a chemical composition of Ca9.5Mg0.5(PO4)6F2 were prepared by mechanical alloying technique. Initially, surface of MFA was modified by bioactive chiral diacid monomer, N-trimellitylimido-l-leucine as a coupling agent to form DM-MFA nanoparticles.

Preparation and properties of high-performance poly(amide–imide) composite films based on glucose-functionalized multiwalled carbon nanotubes

Abstract

Glucose has been covalently linked to multiwalled carbon nanotubes (MWCNTs). After that, the modified MWCNTs were added to a poly(amide–imide) (PAI) matrix. PAI-based composites were fabricated by an ex situ blending technique with 5, 10, and 15% of loading by weight. The composite hybrid films were prepared by a solvent-casting method. The structural properties of all hybrids have been characterized using a large variety of spectroscopic and microscopic techniques.

Preparation and characterization of nanocomposites based on poly(vinyl alcohol) and vitamin B1-modified TiO2 and evaluation of the optical, mechanical, and thermal properties

Abstract

The surface of titanium dioxide (TiO2) nanoparticles (NPs) was modified by biosafe vitamin B1to prevent their aggregation. Then, it was dispersed into the poly(vinyl alcohol) (PVA) matrix under ultrasonic irradiation and nanocomposite (NC) films were prepared using solution casting technique.