Specific features of creep and tribological behavior of polyimide-carbon nanotubes nanocomposite films: effect of the nanotubes functionalization

Gofman, I. V.; Zhang, Baode; Zang, Wanchen; Song, Guangliang; Chen, Chunhai; Li, Yao

doi:10.1007/s10965-013-0258-6

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…%) in the concentration of CNT in the films a decrease in their stiffness was recorded in all the cases. This effect, which has been observed earlier in the study of various nanocomposite materials, including those based on PI [10,11], indicates the onset of aggregation of the filler in the bulk polymer matrix. The data in Table 1 lead to the conclusion that for the studied nanocomposite materials the optimal CNT concentration is 1.0-1.5 vol.…”

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confidence: 68%

Comparative Evaluation of Different Methods of Carboxylation of Carbon Nanotubes as a Modifier of Mechanical Properties of Heat-Resistant Polyimide Based Nanocomposites

et al. 2015

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This work is a comparative evaluation of process effectiveness of multiwall carbon nanotube carboxylation in a variety of chemically active media: in concentrated and dilute nitric acid, in a mixture of nitric and sulfuric acids, in hydrogen peroxide, and in potassium permanganate. The formation of carboxylic groups on the surface of nanotubes was controlled via IR-spectroscopy, and their concentrations were determined using thermogravimetry (TG). The kinetics of increasing the concentration of carboxylic groups in the process of treating nanotubes by various methods was investigated. Nanocomposite films were prepared as a result of introducing the carboxylated nanotubes into an aromatic polyimide. The relationship between mechanical properties of films and the method of carboxylation and duration of chemical treatment was investigated. Treatment in a mixture of nitric and sulfuric acids leads to the most intense carboxylation of nanotubes. But in this environment, as in hydrogen peroxide, there is a marked degradation of nanoparticle surface. Treatment in potassium permanganate proceeds under milder conditions, does not lead to significant generation of defects on the surface of the nanotubes, but requires an increase in process duration.

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confidence: 68%

Comparative Evaluation of Different Methods of Carboxylation of Carbon Nanotubes as a Modifier of Mechanical Properties of Heat-Resistant Polyimide Based Nanocomposites

et al. 2015

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“…Additionally, the modified carbon nanotubes are more easily combined with other materials during reaction. Gofman et al [18] used carbon nanotubes containing a -COOH group as filling materials for polyimide, which showed significantly improved mechanical and tribological properties. Chen et al [19] prepared carbon nanotubes using a mixture of sulfuric acid and nitric acid.…”

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confidence: 99%

Fabrication of Novel CeO2/GO/CNTs Ternary Nanocomposites with Enhanced Tribological Performance

Min

Song

et al. 2019

Applied Sciences

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Increasing demands of multi-functional lubricant materials with well distributed nanoparticles has been generated in the field of oil lubrication. In this study, one-dimensional (1-D) acidified multi-walled carbon nanotubes (CNTs) and two-dimensional (2-D) graphene oxide (GO) sheets were dispersed together under an ultra-sonication condition to form CNTs/GO hybrids and the corresponding CNTs/GO hybrids decorated with uniform zero-dimensional (0-D) cerium oxide (CeO2) nanoparticles were prepared via a facile hydrothermal method. The tribological performance of CeO2/CNTs/GO ternary nanocomposite was systematically investigated using a MS-T3000 ball-on-disk tester. The results demonstrated that CeO2/GO/CNTs nanocomposites can effectively reduce the friction of sliding pairs in paraffin oil. Moreover, the oil with 1 wt% of CeO2/GO/CNTs exhibited the best lubrication properties with the lowest friction coefficient and wear scar diameters (WSD) compared with adding only GO nanosheet, CeO2, and CeO2/CNTs hybrid nanocomposite as lubricant additives. It is concluded that due to the synergistic effect of 0D CeO2, 1D CNTs, and 2D GO during sliding process, a dimensionally mixed CeO2/GO/CNTs nanocomposite exhibits excellent lubricating properties, providing innovative and effective additives for application in the field of lubrication.

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“…% ОСУНТ, l f /d f ~ 100 [37] и ПИ/0.5 мас. % МСУНТ, l f /d f ~ 300-400 [38]. Хотя аспектное отношение нанотрубок в этом случае l f /d f ~ 114 ближе к первому варианту, эффективность их в упрочнении полимера выше.…”

Section: задача интегрирования унт в полимерную матрицуunclassified

Эффективность Применения Углеродных Нанотрубок Для Упрочнения Конструкционных Полимеров

Крестинин¹

2020

Rossijskie nanotehnologii

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Введен показатель эффективности использования углеродных нанотрубок (УНТ) в нанокомпозите как отношение нагрузки, которую несут нанотрубки при заданной средней деформации матрицы, к максимально возможной нагрузке, которая может быть передана на нанотрубки при этой деформации. Проведен обзор наилучших опубликованных результатов по упрочнению полимеров с оценкой эффективности в них УНТ. Анализ данных, приведенных в литературе, показал, что в полимерах верхняя граница эффективности УНТ достигается, если внутри полимера образуется сетка связанных друг с другом нанотрубок. Такая сетка может формироваться путем интегрирования нанотрубок в полимерную матрицу через ковалентное связывание нанотрубок молекулярными мостиками либо за счет физических зацеплений нанотрубок между собой. В термопластичных кристаллизующихся полимерах верхняя граница эффективности УНТ достигается также за счет увеличения степени кристалличности и улучшения микроструктуры полимера, в том числе с применением ориентационной вытяжки нанокомпозита. Полимерные нанокомпозиты с УНТ можно считать перспективными для практического применения, если эффективность нанотрубок в них близка к верхнему пределу или превышает его.

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Specific features of creep and tribological behavior of polyimide-carbon nanotubes nanocomposite films: effect of the nanotubes functionalization

Cited by 18 publications

References 17 publications

Comparative Evaluation of Different Methods of Carboxylation of Carbon Nanotubes as a Modifier of Mechanical Properties of Heat-Resistant Polyimide Based Nanocomposites

Comparative Evaluation of Different Methods of Carboxylation of Carbon Nanotubes as a Modifier of Mechanical Properties of Heat-Resistant Polyimide Based Nanocomposites

Fabrication of Novel CeO2/GO/CNTs Ternary Nanocomposites with Enhanced Tribological Performance

Эффективность Применения Углеродных Нанотрубок Для Упрочнения Конструкционных Полимеров

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