Internal Stresses in Plasma Deposited Polymer Film Coatings

Данилаев, М. П.; Богослов, Е. А.; Polsky, Yu. E.; Yanilkin, I. V.; Vakhitov, I. R.; Gumarov, A.I.; Тагиров, Л. Р.

doi:10.1134/s2075113319030079

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…It is known that p(MA) deposited under low- DC conditions are more susceptible to hydrolysis [ 50 ]. The instability of the film and shrinkage upon hydrolysis likely originates from the relaxation of internal stresses accumulated during the plasma process [ 53 , 54 , 55 ] and volume changes [ 56 , 57 ]. The hydrolysis of the films with high CNC content ( Figure 2 b) also leads to a significant rearrangement of the fibrous structures with the creation of long fibrous networks of entangled fibers.…”

Section: Resultsmentioning

confidence: 99%

Confined Crystallization of Thin Plasma-Polymerized Nanocomposite Films with Maleic Anhydride and Cellulose Nanocrystals under Hydrolysis

Samyn

2022

Molecules

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The creation of novel surface morphologies through thin-film patterning is important from a scientific and technological viewpoint in order to control specific surface properties. The pulsed-plasma polymerization of thin nanocomposite films, including maleic anhydride (MA) and cellulose nanocrystals (CNC), may result in different metastable film morphologies that are difficult to control. Alternatively, the transformation of deposited plasma films into crystalline structures introduces unique and more stable morphologies. In this study, the structural rearrangements of plasma-polymerized (MA+CNC) nanocomposite films after controlled hydrolysis in a humid atmosphere were studied, including effects of plasma conditions (low duty cycle, variable power) and monomer composition (ratio MA/CNC) on hydrolysis stability. The progressive growth of crystalline structures with fractal dendrites was observed in confined thin films of 30 to 50 nm. The structures particularly formed on hydrophilic substrates and were not observed before on the more hydrophobic substrates, as they exist as a result of water penetration and interactions at the film/substrate interface. Furthermore, the nucleating effect and local pinning of the crystallites to the substrate near CNC positions enhanced the film stability. The chemical structures after hydrolysis were further examined through XPS, indicating esterification between the MA carboxylic acid groups and CNC surface. The hydrolysis kinetics were quantified from the conversion of anhydride groups into carboxylic moieties by FTIR analysis, indicating enhanced hydrolytic stability of p(MA+CNC) nanocomposite films relative to the pure p(MA) films.

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Section: Resultsmentioning

confidence: 99%

Confined Crystallization of Thin Plasma-Polymerized Nanocomposite Films with Maleic Anhydride and Cellulose Nanocrystals under Hydrolysis

Samyn

2022

Molecules

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“…Based on our previous studies, we refer this feature to a higher density of cross‐links at low deposition rates. [ 15,33 ] As a result, the Sample 1 film (Figure 9a) deposited at a lower deposition rate gets harder compared with the Sample 2 film (Figure 9b) deposited at higher rates.…”

Section: Characterization Results and Discussionmentioning

confidence: 99%

“…">The mechanical hardness (deformation on compression) of the polymer films obtained at lower electric field strengths ∣ E ∣ < E 0 is several times higher than that obtained at higher (| E | > E 0 ) strengths; based on previous studies, we attribute this feature to a higher density of cross‐links at lower deposition rates. [ 33 ] The results of transmission electron, atomic force microscopies, and dielectric spectroscopy studies give evidence of a uniform distribution of polymer‐encapsulated carbon nanoparticles in the samples obtained by AC dielectric barrier corona discharge plasma synthesis. …”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Single‐stage plasma‐chemical synthesis and characterization of carbon nanoparticle‐polymer suspensions

Данилаев

Богослов

Куклин

et al. 2020

Plasma Processes & Polymers

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A thin‐film styrene polymer–carbon nanoparticle composite was obtained in a single‐stage alternating current dielectric barrier discharge plasma‐chemical process. The allotropic forms of the carbon nanoparticle filler were traced by transmission electron microscopy (TEM). TEM revealed an extraordinary adhesive encapsulation of the carbon nanoparticles by the polymer. It was found that the corona discharge regime provides an onion‐like carbon filler that enhances the mechanical strength and chemical resistance of the synthesized polymer–carbon nanoparticle film. Measurements of the electrical properties of the films implicitly confirmed the uniformity of the carbon filler distribution.

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