Effect of carbon nanotubes on a gases permeability of polymer PMMA

Bakhtin, D. S.; Павлов, С. В.; Grekhov, A. M.

doi:10.1088/1742-6596/1099/1/012036

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…These effects are correlated to the change of the polymer chain mobility, the degree of crystallinity, and the structure of polymer free volume, which interacts with nanoparticles [ 11 ]. The change of permeation is connected with the formation of a percolation cluster in the nanostructured domains at a critical concentration of nanoparticles, such as multi-wall carbon nanotubes (MWCNTs), in the polymer [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon nanotubes have been recently studied as fillers for polyimides because their addition in PI is expected to enhance mechanical and electrical properties while improving load transfer and tear resistance [ 12 ]. The combination of carbon nanotubes and polyimides is deemed to play an important role in the development of novel high-performance nanocomposites [ 10 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

et al. 2020

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Polyimides rank among the most heat-resistant polymers and find application in a variety of fields, including transportation, electronics, and membrane technology. The aim of this work is to study the structural, thermal, mechanical, and gas permeation properties of polyimide based nanocomposite membranes in flat sheet configuration. For this purpose, numerous advanced techniques such as atomic force microscopy (AFM), SEM, TEM, TGA, FT-IR, tensile strength, elongation test, and gas permeability measurements were carried out. In particular, BTDA–TDI/MDI (Ρ84) co-polyimide was used as the matrix of the studied membranes, whereas multi-wall carbon nanotubes were employed as filler material at concentrations of up to 5 wt.% All studied films were prepared by the dry-cast process resulting in non-porous films of about 30–50 μm of thickness. An optimum filler concentration of 2 wt.% was estimated. At this concentration, both thermal and mechanical properties of the prepared membranes were improved, and the highest gas permeability values were also obtained. Finally, gas permeability experiments were carried out at 25, 50, and 100 °C with seven different pure gases. The results revealed that the uniform carbon nanotubes dispersion lead to enhanced gas permeation properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

et al. 2020

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“…It is quite important aspect for the real experiments because usually they cannot be avoided fully. Moreover, presented model may be applied to the other polymer types with incorporated CNTs, where the threshold effect for diffusion coefficient/permeability takes place [6,38,8].…”

Section: Discussionmentioning

confidence: 99%

“…Transfer processes in polymer/CNT systems are directly related to their structure. As experimental and theoretical studies show, changes in the geometry of such systems are often expressed in a nonlinear increase/decrease in the coefficients of electrical conductivity, diffusion, permeability, etc [1,2,3,4,5,6,7,8,9,10,11]. Therefore, this leads to an efficient acceleration/deceleration of the transfer process.…”

Section: Introductionmentioning

confidence: 99%

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Stochastic model for the transfer of gaseous particles in polymer–carbon-nanotube nanocomposites with interfacial regions

Kalashnikova,

Kalashnikov,

Khromov

2023

Phys. Rev. E

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In this work a stochastic model of gaseous transfer in polymer/CNT nanocomposites is presented. The model takes into account interfacial areas, i.e. polymer depletion regions. The local regime of transport is controlled by the density of the polymer. In a dense polymer, this regime corresponds to the ordinary diffusion, while in free volume regions it corresponds to the ballistic transport. The introduction of a free volume and/or a depleted polymer layer near to a CNT wall, leads to the emergence of anomalous diffusion. We have demonstrated how the anomalous diffusion regime changes in the presence of nanotubes for different distributions of polymer density. The presented approach allows us to describe the threshold effect in the diffusion coefficient as a function of CNTs density in polymer/CNT nanocomposites.

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Percolation Effects in Mixed Matrix Membranes with Embedded Carbon Nanotubes

2022

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Polymeric membranes with embedded nanoparticles, e.g., nanotubes, show a significant increase in permeability of the target component while maintaining selectivity. However, the question of the reasons for this behavior of the composite membrane has not been unequivocally answered to date. In the present work, based on experimental data on the permeability of polymer membranes based on Poly(vinyl trimethylsilane) (PVTMS) with embedded CNTs, an approach to explain the abnormal behavior of such composite membranes is proposed. The presented model considered the mass transfer of gases and liquids through polymeric membranes with embedded CNTs as a parallel transport of gases through the polymeric matrix and a “percolation” cluster—bound regions around the embedded CNTs. The proposed algorithm for modeling parameters of a percolation cluster of embedded tubular particles takes into account an agglomeration and makes it possible to describe the threshold increase and subsequent decrease permeability with increasing concentration of embedded particles. The numerical simulation of such structures showed: an increase in the particle length leads to a decrease in the percolation concentration in a matrix of finite size, the power of the percolation cluster decreases significantly, but the combination of these effects leads to a decrease in the influence of the introduced particles on the properties of the matrix in the vicinity of the percolation threshold; an increase in the concentration of embedded particles leads to an increase in the probability of the formation of agglomerates and the characteristic size of the elements that make up the percolation cluster, the influence of individual particles decreases and the characteristics of the percolation transition determine the ratio of the sizes of agglomerates and matrix; and an increase in the lateral linear dimensions of the matrix leads to a nonlinear decrease in the proportion of the matrix, which is affected by the introduced particles, and the transport characteristics of such MMMs deteriorate.

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Effect of carbon nanotubes on a gases permeability of polymer PMMA

Cited by 4 publications

References 16 publications

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

Stochastic model for the transfer of gaseous particles in polymer–carbon-nanotube nanocomposites with interfacial regions

Percolation Effects in Mixed Matrix Membranes with Embedded Carbon Nanotubes

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