Structural and elastic properties and stability characteristics of oxygenated carbon nanotubes under physical adsorption of polymers

Ansari, R.; Ajori, S.; Rouhi, S.

doi:10.1016/j.apsusc.2015.01.190

Cited by 38 publications

(9 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Physically adsorbed polymer (wrapping or nonwrapping) could stabilize the CNTs via steric repulsion among polymer function which has been reported experimentally or by MD modeling . The solvation of the polymer side chains by the aqueous phase and the electrostatic repulsion between polymer chains in the presence of counterions are two main factors which affect the stability of MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

Improved rheological properties and stability of multiwalled carbon nanotubes/polymer in harsh environment

Nourafkan

Haruna

Gardy

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

This work aims to improve the rheological properties and stability of multiwalled carbon nanotubes (MWCNTs)/acrylamide (AA) base skeleton polymer blends at harsh environment of high salinity‐high temperature (HS‐HT) or various pH. Different co/terpolymers have been accomplished to modify the structure of AA polymer by free‐radical copolymerization of AA‐based monomers. Anionic, cationic, and hydrophobic functional groups were used for the synthesis of polyelectrolyte, polyampholytic, and partially hydrophobic AA polymer types. The conversion, molecular weight, and poly dispersity of co/terpolymers have been evaluated by nuclear magnetic resonance (1H‐NMR), gel permeation chromatography, and differential scanning calorimetry analysis. The effects of sonication power, concentration of polymer, and concentration of MWCNTs were also investigated on rheological behavior of co/terpolymers. The results show that negative polyelectrolyte and polyampholytic polymers are the best candidates for the improvement of MWCNTs/polymer stability and viscosity at HS‐HT and alkali environment, respectively. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47205.

show abstract

Section: Resultsmentioning

confidence: 99%

Improved rheological properties and stability of multiwalled carbon nanotubes/polymer in harsh environment

Nourafkan

Haruna

Gardy

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…For comparison of the results with the cases where there only cellulose exists (100% cellulose), two case studies of CNC ( Figure 2g) and cellulose wrap with no CNT (Figure 2h) are studied here. For CNC, the diamond shape structure with 36 chains, [110] and [1][2][3][4][5][6][7][8][9][10] surfaces as the most recommended structure model for CNC is studied here [24,31]. According to previous theoretical study, increasing the diameter of the single-walled cellulose nanotubes results in a more stable structure due to more stable inter-molecular hydrogen bonds [46].…”

Section: Single and Multilayer Cellulose Wrapmentioning

confidence: 99%

“…Currently the main established approach to address this problem is covalent or non-covalent surface modification of CNT with functional groups such as carboxyl groups or polymers such as Poly(3-alkylthiophenes) [6,8]. Although covalent surface modification is more stable, it changes the intrinsic mechanical properties of CNT [9,10]. For example, buckling behavior of O-CNTs (functionalization of CNTs with Oxygens and hydroxyl groups) with 6% oxygenation under compression load showed reduction in elastic modulus and failure strain of CNTs [11].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Mechanical and Adhesion Properties of Carbon Nanotubes Using Aligned Cellulose Wrap (Cellulose Nanotube): A Molecular Dynamics Study

Shishehbor

Pouranian

2020

Nanomaterials

View full text Add to dashboard Cite

Improving the adhesion properties of carbon nanotubes (CNTs) at the molecular scale can significantly enhance dispersion of CNT fibers in polymer matrix and unleash the dormant extraordinary mechanical properties of CNTs in CNT-polymer nanocomposites. Inspired by the outstanding adhesion, dispersion, mechanical, and surface functionalization properties of crystalline nanocellulose (CNC), this paper studies the mechanical and adhesion properties of CNT wrapped by aligned cellulose chains around CNT using molecular dynamic simulations. The strength, elastic modulus, and toughness of CNT-cellulose fiber for different cellulose contents are obtained from tensile and compression tests. Additionally, the effect of adding cellulose on the surface energy, interfacial shear modulus, and strength is evaluated. The result shows that even adding a single layer cellulose wrap (≈55% content) significantly decreases the mechanical properties, however, it also dramatically enhances the adhesion energy, interfacial shear strength, and modulus. Adding more cellulose layers, subsequently, deceases and increases mechanical properties and adhesion properties, respectively. In addition, analysis of nanopapers of pristine CNT, pristine CNC, and CNT-wrapped cellulose reveals that CNT-wrapped cellulose nanopapers are strong, stiff, and tough, while for CNT and CNC either strength or toughness is compromised. This research shows that cellulose wraps provide CNT fibers with tunable mechanical properties and adhesion energy that could yield strong and tough materials due to the excellent mechanical properties of CNT and active surface and hydrogen bonding of cellulose.

show abstract

“…The reliability on the mechanical property prediction by the MD simulation can also be seen for other polymer/ nano-filler composites in Refs. [30][31][32][33][34][35] , [44][45][46] . According to the stress variation at different strains, the distributions of atomic local shear strain ηiMises at elastic, plastic, ultimate stress regions clearly show the local structural evolution during the tensile process within the PE matrix and AgNP as well as the interface of PE/AgNP.…”

Section: Discussionmentioning

confidence: 99%

“…The results show that the Young's modulus of HDPE can be increased by adding metal powder into HDPE, while the tensile strength of HDPE filled with Al and Fe reached the maximum value at 10%, while the maximum value for Cu-HDPE is at 20% 29 . Beside the studies about the effect of nanofiller on the mechanical property of composites, Ansar conducted a series of MD simulations to find the methods to enhance the mechanical properties of several nanofillers [30][31][32][33][34] . These modified nanofillers were further used to improve the mechanical properties of composites.…”

mentioning

confidence: 99%

The Mechanical Behaviors of Polyethylene/Silver Nanoparticle Composites: an Insight from Molecular Dynamics study

Chen

et al. 2020

Sci Rep

View full text Add to dashboard Cite

cheng-tang pan 3 & tai-Ding You 3 this research uses molecular dynamics simulation (MD) to study the mechanical properties of pristine polyethylene (pe) and its composites which include silver nanoparticles (pe/Agnps) at two Agnp weight fractions of 1.05 wt% and 3.10 wt%. The stress-strain distribution of the tensile process shows that the embedded AgNPs can significantly improve the Young's modulus and tensile strength of the pristine PE, due to improvements in the local density and strength of the PE near the AgNP surface in the range of 12 Å. Regarding the effect of temperature on the mechanical properties of pristine PE and PE/AgNP composites, the Young's modulus and the strength of the pristine PE and PE/AgNP composites decreased significantly at 350 K and 450 K, respectively, consistent with predicted melting temperature of pristine PE, which lies at around 360 K. At such temperatures as these, PE material has stronger ductility and a higher mobility of AgNPs in the PE matrix than those at 300 K. With the increase of tensile strain, AgNPs tend to be close, and the fracture of PE leads to a similarity between both the Young's modulus and ultimate strength found for the pristine PE and those found for the PE/AgNP composites at 350 K and 450 K, respectively. The development of polymer-based composites by the addition of different fillers has proved to be a promising approach to alter the materials properties of polymers, and this manufacturing method makes it possible for new composites to be used in industrial applications 1,2. For example, properties found in pristine polymers like mechanical strength 3 , elasticity 4,5 , plasticity 6,7 , electrical conductivity 8,9 , and thermal conductivity 10,11 , can be significantly enhanced when the polymer matrixes undergo mixing with filler material that has been well-dispersed. Among all kinds of thermoplastic polymers, polyethylene (PE) has found wide use due to its excellent mechanical properties. Among these are specific mechanical properties like a high ductility of 6MN/m 2 , such that polyethylene can be stretched to 103% of its length before cracking, unlike some metals, which can withstand only 100.71%. Another mechanical property of PE, impact strength, is more than 90 N/cm 2 12 , the highest among thermoplastic polymers. Polyethylene's heat resistance is excellent, with thermal stability of around 70 to 110 °C 13 , and its melting point is typically 105 to 115 °C 14. Consequently, many potential fillers such as a poly(HEMA) matrix 15 , carbon fiber 16 , and clay (montmorillonite) 17 , have been mixed with pristine PE to achieve specific improvements. These composites have been used extensively in the automotive industry in reinforced glass and electrical insulation, and in biomedical applications such as artificial joints 18. Many experimental methods have been carried out to study the properties of PE composites. For example, Nawang showed that the mechanical properties such as yield strength and tensile strength of starch or linear low density polyethylen...

show abstract

Structural and elastic properties and stability characteristics of oxygenated carbon nanotubes under physical adsorption of polymers

Cited by 38 publications

References 63 publications

Improved rheological properties and stability of multiwalled carbon nanotubes/polymer in harsh environment

Improved rheological properties and stability of multiwalled carbon nanotubes/polymer in harsh environment

Tuning the Mechanical and Adhesion Properties of Carbon Nanotubes Using Aligned Cellulose Wrap (Cellulose Nanotube): A Molecular Dynamics Study

The Mechanical Behaviors of Polyethylene/Silver Nanoparticle Composites: an Insight from Molecular Dynamics study

Contact Info

Product

Resources

About