Features of Functionalization of the Surface of Alumina Nanofibers by Hydrolysis of Organosilanes on Surface Hydroxyl Groups

Симунин, М. М.; Voronin, A. I.; Fadeev, Yu. V.; Mikhlin, Yu. L.; Lizunov, Denis A.; Samoilo, Alexander S.; Chirkov, D Yu; Voronina, S. Yu.; Khartov, S. V.

doi:10.3390/polym13244374

Cited by 9 publications

(8 citation statements)

References 28 publications

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“…The percolation threshold was calculated using the known ratios [ 27 ] with the assumption that the volume excluded by nanofibers is proportional to the volume of the compounded polymer. Knowing the basic physicochemical properties of AONF [ 15 ] and the aspect ratio of nanofibers close to γ = 50, the percolation threshold is estimated to be approximately 0.22%.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, aluminum oxide nanofibers (AONF), which are obtained by growing from a melt in the presence of a non-wettable refractory component in the solid phase, have been of particular interest [ 14 ]. The length of the resulting fibers ranges from fractions of a micron to a centimeter, and the diameter of a single fiber ranges from 3 to 45 nm [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Effect of Modified Aluminum Oxide Nanofibers on the Properties of PLA-Based Films

et al. 2022

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To find out whether Al2O3 nanofiller is effective in improving the characteristics of polymer composites, composite polymer films based on biodegradable polylactide and epoxidized aluminum oxide nanofibers were obtained by solution casting. Surface morphology, mechanical and thermal properties of composites were studied by SEM, IR-Fourier spectroscopy, DSC and DMA. It was shown that, below and above the percolation threshold, the properties of the films differ significantly. The inclusion of alumina nanoparticles up to 0.2% leads to a plasticizing effect, a decrease in the crystallization temperature and the melting enthalpy and an increase in the tensile stress. An increase in the content of alumina nanoparticles in films above the percolation threshold (0.5%) leads to a decrease in the crystallinity of the films, an increase in stiffness and a drop in elasticity. Finding the percolation threshold of alumina nanoparticles in PLA films makes it possible to control their properties and create materials for various applications. The results of this study may have major significance for the commercial use of aluminum oxide nanofibers and can broaden the research field of composites.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Modified Aluminum Oxide Nanofibers on the Properties of PLA-Based Films

et al. 2022

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“…However, the addition of nanofibers to polymers by itself cannot be effective without matching the surface of alumina nanofibers with the physicochemical properties of the matrix. A high affinity of the surface of nanofibers and polymer can be achieved using the silanization technology [ 17 ], in which a silane with a given functional group is hydrolyzed on hydroxyl groups on the surface of alumina nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Addition of Alumina Nanofibers on the Strength of Epoxy Resins

et al. 2023

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The paper describes the effect of the addition of alumina nanofibers on the mechanical properties of the epoxy resin. Alumina nanofibers functionalized with epoxypropyl functional groups are used in this work. The dependence of the mechanical characteristics on the amount of the additive, as well as the features of its distribution in the material, is investigated. In the work, nanocomposites were obtained, which are epoxy resin with aluminum oxide nanofibers. The mechanical properties of the samples were studied by bending tests and differential mechanical analysis (DMA). It has been shown that the addition of alumina nanofibers leads to an increase in ultimate flexural strength. The maximum of this increase is near the percolation threshold of alumina nanofibers in epoxy resin. With the addition of 0.2% alumina nanofibers, the ultimate flexural strength increases from 41 to 71 MPa. It is shown that after exceeding the percolation threshold of nanofibers, the ultimate strength decreases. In this case, the elastic modulus increases from 0.643 to 0.862 GPa. DMA is shown that the glass transition temperature decreases with increasing amount of the additive. This indicates a decrease in the molecular weight of the polymer. By implication, this suggests that the hardener connects the epoxypropyl functional groups on the nanofibers and the epoxy groups in the resin, and as a result of this process, the nanofibers become natural polymer chain length limiters. The data obtained from mechanical testing and differential mechanical analysis can be used to strengthen epoxy resins in polymer composite materials and molding compositions.

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“…The paper considers the study and preparation of nanocomposite powder paints based on alumina nanofibers, which we used in our previous work on compounding [7]. The introduction of additives into the resin is most effective when their surface is matched in terms of physicochemical properties with the resin material.…”

Section: Introductionmentioning

confidence: 99%

Carboxyl-functionalized aluminum oxide nanofibers for powder coatings

Симунин

Chirkov

Samoilo

et al. 2022

J. Phys.: Conf. Ser.

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The paper considers the production and use of alumina nanofibrous additives in nanocomposite powder paints. The main component of powder paints are polyester resins with a large number of free carboxyl groups, which are cross-linked with special hardening additives. The introduction of additives into the resin is most effective when their surface is matched in terms of physicochemical properties with the resin material. In order to increase the affinity of the alumina nanofibers with the powder paint matrix, the amphoteric surface of the nanofibers must become acidic. The paper describes a method for the functionalization of alumina nanofibers by successive silanization with aminopropyltriethoxysilane and priming with oxalic acid. The paper described about the compounding of alumina nanofibers leads to increase of the coating strength and an increase in its elasticity. Priming alumina nanofibers by aminopropyltriethoxysilane in toluene leads to its functionalization sufficient to homogenize the nanofibers in the polymer media of the powder paint and improve its product properties. The formation of an amide bond after the final stage of priming of alumina nanofibers in oxalic acid by indirectly method is shown.

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Features of Functionalization of the Surface of Alumina Nanofibers by Hydrolysis of Organosilanes on Surface Hydroxyl Groups

Cited by 9 publications

References 28 publications

Study of the Effect of Modified Aluminum Oxide Nanofibers on the Properties of PLA-Based Films

Study of the Effect of Modified Aluminum Oxide Nanofibers on the Properties of PLA-Based Films

Influence of the Addition of Alumina Nanofibers on the Strength of Epoxy Resins

Carboxyl-functionalized aluminum oxide nanofibers for powder coatings

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