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

Abdolmaleki, Amir; Mallakpour, Shadpour; Rostami, Maryam

doi:10.1177/0954008314565399

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Thermal degradation is observed in rGO S ( Figure 4 A), where graphite functional groups (OH, C–O–C) are still found in the peak at 218.9 °C [ 56 ] and starch degradation at 301.8 °C [ 57 ]. Figure 4 B presents the two main peaks of rGO F at 204.5 and 339.1 °C, which are both reported as thermal degradation of the fructose grafted onto carbon nanostructures [ 58 , 59 , 60 , 61 , 62 ]. In both rGO S and rGO F weight loss at temperatures below 150 °C increased considerably (water evaporation) due to the presence of polar groups of organic molecules increasing water absorption in the nanohybrids.…”

Section: Resultsmentioning

confidence: 99%

Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

et al. 2021

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In this work, we report the synthesis of graphene oxide (GO) nanohybrids with starch, fructose, and micro-cellulose molecules by sonication in an aqueous medium at 90 °C and a short reaction time (30 min). The final product was washed with solvents to extract the nanohybrids and separate them from the organic molecules not grafted onto the GO surface. Nanohybrids were chemically characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy and analyzed by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). These results indicate that the ultrasound energy promoted a chemical reaction between GO and the organic molecules in a short time (30 min). The chemical characterization of these nanohybrids confirms their covalent bond, obtaining a grafting percentage above 40% the weight in these nanohybrids. This hybridization creates nanometric and millimetric nanohybrid particles. In addition, the grafted organic molecules can be crystallized on GO films. Interference in the ultrasound waves of starch hybrids is due to the increase in viscosity, leading to a partial hybridization of GO with starch.

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Section: Resultsmentioning

confidence: 99%

Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

et al. 2021

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“…In recent years, carbon nanotechnology has been the focus of research and is widely used in many fields, due to their excellent physical and chemical properties, and the development of carbon nanomaterials has promoted the progress in materials, medicine, chemical engineering, artificial intelligence, and other fields. Multiwalled carbon nanotube (MWCNT) is a new type of high-strength carbon material, which has unusual mechanical, electrical, and chemical properties, and it is usually used as effective reinforcement of the composite; exhibits good strength, elasticity, fatigue resistance, and isotropy; and greatly improves the performances of the composite [8][9][10]. Unmodified MWCNTs are prone to reunite in the polymer matrix, so the modification of MWCNTs is very important [11,12].…”

Section: Introductionmentioning

confidence: 99%

Micromorphology and Mechanical and Dielectric Properties of Bismaleimide Composite Modified by Multiwalled Carbon Nanotubes and Polyethersulfone

Chen

Geng

Han

et al. 2018

Journal of Nanomaterials

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Multiwalled carbon nanotubes (MWCNTs) were modified by oxidizing agent to obtain O-MWCNTs, and the surface of it was coated with active group. 4,4′-Diaminodiphenylmethane bismaleimide (MBMI) was used as matrix, 3,3′-diallyl bisphenol A (BBA) and bisphenol-A diallyl ether (BBE) were used as reactive diluent, polyethersulfone (PES) as toughening agent, and O-MWCNTs as modifier; OMWCNT/PES-MBAE composite was prepared through in situ sol-gel method. The effect of PES and OMWCNTs on the mechanical and dielectric properties of composite was analyzed, and the microstructure was examined by transmission electron microscope (TEM) and scanning electron microscope (SEM). The mechanism of composite toughened by PES and OMWCNTs was observed and analyzed. The results showed that Diels-Alder reaction between MBMI and allyl compounds occurred completely and unsaturated double bond disappeared. O-MWCNTs and PES resin dispersed smoothly in polymer matrix and were used as reinforcement, and PES resin and O-MWCNTs could synergistically improve the properties of the composite and exhibited a typical ductile fracture. The impact and bending strengths were 16.09 kJ/m2 and 153.57 MPa, which were 74.32% and 53.08% higher than those of the MBAE matrix, respectively, and the dielectric constant and the dielectric loss were 3.76 (100 Hz) and 2.79 × 10−3 (100 Hz), when the content of PES was 2 wt% and O-MWCNTs was 0.02 wt%. The outstanding properties of the material made it play an important role in high-performance insulating material applications.

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“…12 To solve these problems in the most effective way, the nanotubes' surface is fuctionalized. [13][14][15][16][17][18][19] Surface functionalization of nanotubes helps to stabilize the dispersion, prevents the reaggregation nanotubes, and the polymer matrix leads to a coupling with the nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Isothermal kinetics and thermodynamics studies of curing reaction of epoxy-aromatic diamine reinforced with epoxy functional MWCNT

Barghamadi

2016

High Performance Polymers

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This study reports the cure kinetics and thermodynamics of an epoxy functional multiwall carbon nanotube-containing epoxy nanocomposite obtained by the polymerization of diglycidyl ether of bisphenol A with diaminodiphenyl sulfone as a curing agent through isothermal technique of differential scanning calorimetry. Isothermal kinetic parameters including reaction orders ( m, n), rate constants ( k1, k2), activation energy ( Ea), and pre-exponential factor ( A) were estimated using Kamal autocatalytic model. The model gives a good description of curing kinetics at various temperatures prior to the onset of vitrification. Thermodynamic parameters such as enthalpy (Δ H#), entropy (Δ S#), and Gibbs free energy (Δ G#) changes were also determined using the rate constants from the isothermal kinetic analysis and transition state theory. The thermodynamic functions were shown to be very sensitive parameters for the evaluation of the cure reaction.

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

Cited by 4 publications

References 34 publications

Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

Micromorphology and Mechanical and Dielectric Properties of Bismaleimide Composite Modified by Multiwalled Carbon Nanotubes and Polyethersulfone

Isothermal kinetics and thermodynamics studies of curing reaction of epoxy-aromatic diamine reinforced with epoxy functional MWCNT

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