Effect of nanosized carbon fillers on the hydrolytic stability of films of a heat-resistant aromatic polyimide

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

doi:10.1134/s1070427217010116

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5] Polyimide (PI) paper-based composites, as one of the high-performance functional composites, have also been widely used in various fields. For example, they were used as broadband filtering composites for aircrafts, missiles, satellites, and radar covers 6 ; heat-resistant insulating composites for aero-spacecraft engines, transformers, and motors [7][8][9][10][11][12][13] ; honeycomb structure composites for secondary force structures in the cabins, like door lining boards, floorboards, and partition walls, 8,[14][15][16] and so on. Therefore, PI paper-based functional composites have attracted much attention and they are expected to have promising applications in high value-added fields.…”

Section: Introductionmentioning

confidence: 99%

Highly improved mechanical and dielectric properties of paper-based composites with polyimide chopped fiber functionalized by ethylenediamine

Xie

Zhang

et al. 2018

High Performance Polymers

View full text Add to dashboard Cite

In this study, polyimide (PI) chopped fibers were modified by ethylenediamine, and PI paper-based composites were fabricated using the as-modified PI chopped fibers and para-aramid fibrids which served as raw materials through the wet-forming process. The influence of different alkali treatment durations on the properties of PI fibers and composites was investigated. In sharp contrast with the pristine PI fibers, there was a satisfying difference in modified PI fibers including rougher surfaces and improved wettability due to the introduction of hydrophilic groups as confirmed by scanning electron microscope and Fourier transform infrared spectrometer. With increase in the modification time, the tensile index, the tearing index, and the internal bond strength of the composites were improved by 40.6, 27.0, and 103.57%, respectively, due to the hydrogen bonds. Meanwhile, the dielectric strength of the composites increased by 77.2% compared with the unmodified ones. These remarkable changes were mainly attributed to the enhanced interfacial bonding of the composites and decreased porosity in the three-dimensional network structure of the paper. Moreover, thermal stability was kept preferably within a certain range in spite of slight decrease.

show abstract

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

2018

View full text Add to dashboard Cite

Effect of nanosized carbon fillers on the hydrolytic stability of films of a heat-resistant aromatic polyimide

Cited by 3 publications

References 4 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

Highly improved mechanical and dielectric properties of paper-based composites with polyimide chopped fiber functionalized by ethylenediamine

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

Contact Info

Product

Resources

About