Hydrolytic Stability of Films of Aromatic Polyimides and Composites on Their Basis, Filled with Carbon Nanocones

Bykova, E. N.; Gofman, I. V.; Vlasova, E. N.

doi:10.1134/s1070427218090082

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…The highest value of the excess free volume was observed for the PI-MWCNT composite (ρ exp /ρ calc = 0.994). As it was shown in previous studies [16,17] and confirmed by the described work, a clear correlation is observed between the excess free volume determined in the densitometric experiment and extent of the hydrolytic stability of composites.…”

Section: Resultssupporting

confidence: 90%

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Influence of nanoparticles of various types as fillers on resistance to hydrolysis of films of heat-resistant polyimide

Bykova¹,

Gofman²,

Иванькова³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Impact of nanoparticles of various types as fillers on the stability of the poly(pyromellitimide)-based nanocomposite films' properties in alkaline hydrolysis was studied. It was shown that the introduction of nanoparticles into the polymer can lead to an increase in excess free volume. This fact is evidenced by scanning electron microscopy and densitometric studies. The increase of the excess free volume was shown to provoke a rise of the diffusion intensity of the hydrolyzing agent in the films volume during their exposure to an alkaline medium. This effect leads to film swelling and, thereby, to increases of the intensity of the destructive action of hydrolysis on the material. Chemical surface pretreatment of the nanofiller allows one to obtain a composite with an increased packing density compared to that for a composite with unmodified nanoparticles. However, the hydrolytic stability of such a film still remains somewhat inferior to that of the pristine polyimide.

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Section: Resultssupporting

confidence: 90%

“…In our previous studies [16,17], we have selected the extremely severe medium to investigate the hydrolysis of PI films taking into account high hydrolytic stability of these materials. These conditions results in a rather intensive process of hydrolytic destruction of PMDA-ODA control film just in the first hours of the experiment.…”

Section: Resultsmentioning

confidence: 99%

Influence of nanoparticles of various types as fillers on resistance to hydrolysis of films of heat-resistant polyimide

Bykova¹,

Gofman²,

Иванькова³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…While PVA and Ecoflex (aliphatic‐aromatic copolyesters) are both regarded synthetic biodegradable polymers, 110,111 MXenes are 2D transition metal carbide nanomaterials known for their great conductivity, processability, and mechanical properties 112 . Kapton is a polyimide material developed in the 1960s that exhibit great thermal stability at a wide range of temperature (−269°C to 400°C) and hydrolytic stability 113,114 . Although the electrode (hydrogel‐based component) of the TENG is considered almost entirely biodegradable, the TENG as a whole is partially biodegradable due to the Kapton tribonegative layer.…”

Section: Hydrogel Overviewmentioning

confidence: 99%

“…112 Kapton is a polyimide material developed in the 1960s that exhibit great thermal stability at a wide range of temperature (À269 C to 400 C) and hydrolytic stability. 113,114 Although the electrode (hydrogel-based component) of the TENG is considered almost entirely biodegradable, the TENG as a whole is partially biodegradable due to the Kapton tribonegative layer. Similarly, Kim et al 69 fabricated a bio-inspired hydrogel based on catechol, chitosan (CTS), and diatom frustule (silicic acid external layers of microalgae).…”

Section: Degradabilitymentioning

confidence: 99%

Hydrogel‐based triboelectric nanogenerators: Properties, performance, and applications

Torres

Troncoso

De-la-Torre

2021

Intl J of Energy Research

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Summary The development of triboelectric nanogenerators (TENGs) in 2012 revolutionized the vision of environmental energy harvesting. Nowadays, TENG assembly, working mode, and material selection are investigated continuously in order to obtain high‐performance and long‐lasting devices. Hydrogels are flexible and stretchable water‐swollen 3D polymer networks, which can be tailored to conduct electricity and render outstanding mechanical properties. Hydrogels have been used to develop novel flexible wearable TENGs. Here, we review the current knowledge concerning hydrogel‐based TENGs, including an overview of relevant hydrogel characteristics, hydrogel‐based TENG performance, and their practical applications. The single‐electrode TENG working mode is the most popular in hydrogel‐based TENGs as they can be easily attached and stretched for biomechanical energy harvesting. Hydrogel‐based TENGs have demonstrated to be capable of delivering high electrical output (250‐400 V, ≥10 μA) and being robust enough for devices that last for several months. Biomechanical energy sensing and harvesting, smart farming, biomedical, and human–machine control interfaces are investigated as potential applications of hydrogel‐based TENGs. Interestingly, energy harvesting from human motion is of particular interest for this type of TENG due to its outstanding stretchability, strength, and additional physical properties, such as self‐healing ability. In most cases, the devices are capable of powering small electronics entirely from harvested biomechanical energy. Biomedical applications involved wound healing acceleration driven by TENG‐powered electrical stimuli and disease monitoring, including implantable devices. Despite showing promising electrical performance, controlling water evaporation is still challenging to maintain the mechanical and conductive properties of hydrogel‐based TENGs. On the other hand, fully biodegradable TENGs are largely unexplored, as well as many applications, such as blue energy harvesting, the internet of things, and others. The next steps in this line of research must focus on addressing the main challenges of hydrogel‐based TENGs and filling the application knowledge gaps.

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Hydrolytic Stability of Films of Aromatic Polyimides and Composites on Their Basis, Filled with Carbon Nanocones

Cited by 2 publications

References 10 publications

Influence of nanoparticles of various types as fillers on resistance to hydrolysis of films of heat-resistant polyimide

Influence of nanoparticles of various types as fillers on resistance to hydrolysis of films of heat-resistant polyimide

Hydrogel‐based triboelectric nanogenerators: Properties, performance, and applications

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