Maryam Rostami

Morphological and Thermal Properties of Poly(amide-imide)/ZnO Nanocomposites Derived from 4,4′-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) and 3,5-diamino-N-(4-hydroxyphenyl)benzamide

A new nanostructure poly(amide-imide) (PAI) was prepared from the polymerization of 4,4′-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) as a diacid with 3,5-diamino-N-(4-hydroxyphenyl)benzamide using triphenyl phosphite as a condensing agent and tetra-n-butylammonium bromide as a green media. The synthesized polymer was used to prepare PAI/ZnO nanocomposites (PZNC)s using nano-ZnO surface-coupled by N-trimellitylimido-L-alanine diacid as a coupling agent through ultrasonic process. The resulting PZNCs were also characterized by FT-IR, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The TEM and FE-SEM results showed a good dispersion of nanoscale inorganic particles in the polymer matrix.

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

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. The resulting nanocomposites were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and thermogravimetric analysis. TEM and FESEM results confirm good dispersion of CA-MWCNTs in the polymer matrix.

Role of Carboxylic Acid-Functionalized MWCNTs in Potentially Biodegradable Poly(Amide–Imide) Nanocomposites Based on N,N′-(Pyromellitoyl)-bis-S-valine: Preparation, Thermal and Morphological Properties

A simple solution-blending process was used to efficiently disperse of carboxyl-modified multiwalled carbon nanotubes into a potentially biodegradable poly(amide–imide) to obtain poly(amide–imide)/carboxyl-modified multiwalled carbon nanotubes bionanocomposites. Carboxyl-modified multiwalled carbon nanotubes were utilized to better dispersion of multiwalled carbon nanotubes into the polymer matrix. The poly(amide–imide)/carboxyl-modified multiwalled carbon nanotube bionanocomposites were prepared with different carboxyl-modified multiwalled carbon nanotube contents (5–15 wt%). The resulting bionanocomposites are characterized by several techniques, powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Adding carboxyl-modified multiwalled carbon nanotube into polymer matrix significantly increased the thermal stability of bionanocomposites due to the increased interfacial interaction between the poly(amide–imide) matrix and carboxyl-modified multiwalled carbon nanotube. GRAPHICAL ABSTRACT

Performance evaluation of fructose-functionalized multiwalled carbon nanotubes/biodegradable poly(amide–imide) based on N,N′-(pyromellitoyl)-bis-S-valine bionanocomposite

Carboxyl-modified multiwalled carbon nanotubes (MWCNTs) were functionalized with fructose as a biological active molecule in a green method. Then a simple ultrasonication-assisted solution blending process was used to disperse the fructose-functionalized MWCNTs (f-MWCNTs) into a biodegradable poly(amide–imide) (PAI) efficiently to obtain PAI/f-MWCNT bionanocomposites. The effect of f-MWCNT on thermal and structural properties of PAI was investigated by several techniques, including powder X-ray diffraction, field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis (TGA). The FESEM and TEM results showed that the f-MWCNT wholly separated and uniformly dispersed in the PAI matrix. TGA results showed that thermal stability of the composites was significantly increased with the addition of f-MWCNT compared with the pure PAI.

Influence of biosafe amino acid-functionalized multiwalled carbon nanotubes on the morphology and thermal properties of the poly(amide–imide) nanocomposites containing N,N′-(pyromellitoyl)-bis-S-valine segments:

In this study, S-valine-functionalized multiwalled carbon nanotubes (f-MWCNTs)/poly(amide–imide) (PAI) bionanocomposites (BNC)s were prepared by a simple ultrasonication-assisted solution blending process. First, carboxylated MWCNTs were functionalized with S-valine to achieve a fine dispersion of f-MWCNT bundles in the PAI matrix due to hydrogen bonding and π–π stacking interaction between f-MWCNTs and polymer functional groups and aromatic moieties. The existence of S-valine as a biodegradable segment in both f-MWCNTs and optically active PAI provided potentially biodegradable nanocomposites and caused compatibility between f-MWCNTs and the polymer matrix. The obtained BNCs were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The TEM and FESEM images confirmed good dispersion of f-MWCNTs in the polymer matrix. The results of TGA and XRD analysis suggested that a good thermal stability and dispersion occurred especially with low filler amounts (5 wt%) of f-MWCNTs.

Morphology and thermal properties of environmental friendly nanocomposites using biodegradable poly(amide–imide) based on N-trimellitylimido-S-valine matrix reinforced by fructose-functionalized multi-walled carbon nanotubes

Herein, multi-walled carbon nanotubes (MWCNTs) were functionalized by fructose as a biological molecule based on a one-pot, rapid, and green methodology. Fructose-functionalized MWCNTs (f-MWCNT)s were characterized by a set of methods including Fourier transform infrared spectroscopy, X-ray diffraction, field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), and thermogravimetric analysis. Then, an optically active poly(amide–imide) (PAI) based on S-valine as a biodegradable segment was synthesized, as a matrix, to prepare PAI/f-MWCNT bionanocomposites (BNC)s. The morphological characterization based on FE-SEM and TEM has confirmed that f-MWCNTs were distributed uniformly, indicating a good dispersion of nanotubes in the PAI matrix. Also, the thermal stability of the BNCs containing the f-MWCNT was improved due to the increased interfacial interaction between the PAI chains and f-MWCNT and also good dispersion of f-MWCNT in the polymer matrix.

Green Synthesis of Amino Acid Functionalized Multi-walled Carbon Nanotubes/Poly(amide–imide) Based on N-Trimellitylimido-S-valine Nanocomposites by Sonochemical Technique

Herein, a functional S-valine amino-acid (valine) based poly(amide–imide) (PAI) was prepared in a green situation. Carbon nanotubes (NTs) were functionalized with valine to fabricate NT/PAI nanostructures composite (PNCs) by incorporating NTs into the PAI matrix. Homogeneous dispersion of NTs was achieved by the modified NTs and ultrasonication method. The influences of the functionalized NTs on the morphology, structure, and thermal of PNCs were characterized extensively by several techniques. The findings showed that the modified NTs caused a fine interaction with PAI chains and improvement dispersion of NTs in the matrix along with much enhanced thermal stability.