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Materials
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Interaction of Gaseous Plasma with Polymers and Polymer Composites
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Interaction of Gaseous Plasma with Polymers and Polymer Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Polymeric Materials".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 7397

Special Issue Editor

Prof. Dr. Miran Mozetič

E-Mail Website
Guest Editor
Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Interests: surface engineering; non-equilibrium gaseous plasma; polymers; organic materials; plasma technologies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymers and polymer composites are often treated by gaseous plasma to obtain the desired surface finish, such as surface functionalization, nanostructuring, and selective etching (preferential removal of one component from the surface of a polymer composite). Although the technique has been used on an industrial scale for decades, the scientific background of the interaction between reactive gaseous species and polymer materials is still unclear. In particular, there is a lack of reliable information on the surface finish versus the plasma parameters. Furthermore, the evolution of surface properties of complex polymers and block and graft copolymers upon plasma treatment has rarely been reported. The plasma treatment often causes unwanted effects, such as modification of subsurface film, formation of loosely bonded molecular fragments on the polymer surface, and aging—spontaneous modification of surface properties of polymers and polymer composites that have been exposed to gaseous plasma.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome. Critical reviews in specific modern topics such as treatment of polymers and polymer composites with plasma sustained in gas mixtures or rarely used reactive gases are particularly welcome. The authors are encouraged to submit manuscripts reporting unexpected results providing they can present scientifically spotless explanations.

Prof. Dr. Miran Mozetič
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gaseous plasma
  • polymers
  • polymer composites
  • surface properties
  • functionalization
  • nanostructuring
  • grafting

Published Papers (3 papers)

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Research

16 pages, 5932 KiB  
Article
Investigation of Surface Modification of Polystyrene by a Direct and Remote Atmospheric-Pressure Plasma Jet Treatment
by Alenka Vesel and Gregor Primc
Materials 2020, 13(11), 2435; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13112435 - 26 May 2020
Cited by 13 | Viewed by 2155
Abstract
Localized functionalization of polymer surface with an atmospheric-pressure plasma jet was investigated at various treatment conditions. Polystyrene samples were treated with the plasma jet sustained in argon under direct or remote conditions. The two-dimensional evolution of surface wettability and the spot size of [...] Read more.
Localized functionalization of polymer surface with an atmospheric-pressure plasma jet was investigated at various treatment conditions. Polystyrene samples were treated with the plasma jet sustained in argon under direct or remote conditions. The two-dimensional evolution of surface wettability and the spot size of the treated area was determined systematically by measuring apparent water contact angles. Modification of surface chemistry and the formation of functional groups were investigated by X-ray photoelectron spectroscopy (XPS). The saturation of surface wettability and functional groups was observed even after a second of treatment providing the sample was placed close to the exhaust of the discharge tube. The spot diameter of the modified area increased logarithmically with increasing treatment time. However, it decreased linearly when increasing the distance. At the edge of the glowing plasma, however, the modification of surface properties was more gradual, so even 30 s of treatment caused marginal effects. With a further increase in the distance from the edge of the glowing plasma, however, there were no further treatment effects. The results are explained by significant axial as well as radial gradients of reactive species, in particular hydroxyl radicals. Full article
(This article belongs to the Special Issue Interaction of Gaseous Plasma with Polymers and Polymer Composites)
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18 pages, 4341 KiB  
Article
PECVD of Hexamethyldisiloxane Coatings Using Extremely Asymmetric Capacitive RF Discharge
by Žiga Gosar, Janez Kovač, Denis Đonlagić, Simon Pevec, Gregor Primc, Ita Junkar, Alenka Vesel and Rok Zaplotnik
Materials 2020, 13(9), 2147; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13092147 - 06 May 2020
Cited by 9 | Viewed by 2143
Abstract
An extremely asymmetric low-pressure discharge was used to study the composition of thin films prepared by PECVD using HMDSO as a precursor. The metallic chamber was grounded, while the powered electrode was connected to an RF generator. The ratio between the surface area [...] Read more.
An extremely asymmetric low-pressure discharge was used to study the composition of thin films prepared by PECVD using HMDSO as a precursor. The metallic chamber was grounded, while the powered electrode was connected to an RF generator. The ratio between the surface area of the powered and grounded electrode was about 0.03. Plasma and thin films were characterised by optical spectroscopy and XPS depth profiling, respectively. Dense luminous plasma expanded about 1 cm from the powered electrode while a visually uniform diffusing plasma of low luminosity occupied the entire volume of the discharge chamber. Experiments were performed at HMDSO partial pressure of 10 Pa and various oxygen partial pressures. At low discharge power and small oxygen concentration, a rather uniform film was deposited at different treatment times up to a minute. In these conditions, the film composition depended on both parameters. At high powers and oxygen partial pressures, the films exhibited rather unusual behaviour since the depletion of carbon was observed at prolonged deposition times. The results were explained by spontaneous changing of plasma parameters, which was in turn explained by the formation of dust in the gas phase and corresponding interaction of plasma radicals with dust particles. Full article
(This article belongs to the Special Issue Interaction of Gaseous Plasma with Polymers and Polymer Composites)
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10 pages, 1968 KiB  
Article
Plasma Treatment of Poly(ethylene terephthalate) Films and Chitosan Deposition: DC- vs. AC-Discharge
by Tatiana S. Demina, Mikhail S. Piskarev, Olga A. Romanova, Andrey K. Gatin, Boris R. Senatulin, Elena A. Skryleva, Tatiana M. Zharikova, Alla B. Gilman, Alexander A. Kuznetsov, Tatiana A. Akopova and Peter S. Timashev
Materials 2020, 13(3), 508; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13030508 - 21 Jan 2020
Cited by 17 | Viewed by 2648
Abstract
Plasma treatment is one of the most promising tools to control surface properties of materials tailored for biomedical application. Among a variety of processing conditions, such as the nature of the working gas and time of treatment, discharge type is rarely studied, because [...] Read more.
Plasma treatment is one of the most promising tools to control surface properties of materials tailored for biomedical application. Among a variety of processing conditions, such as the nature of the working gas and time of treatment, discharge type is rarely studied, because it is mainly fixed by equipment used. This study aimed to investigate the effect of discharge type (direct vs. alternated current) using air as the working gas on plasma treatment of poly(ethylene terephthalate) films, in terms of their surface chemical structure, morphology and properties using X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy and contact angle measurements. The effect of the observed changes in terms of subsequent chitosan immobilization on plasma-treated films was also evaluated. The ability of native, plasma-treated and chitosan-coated films to support adhesion and growth of mesenchymal stem cells was studied to determine the practicability of this approach for the biomedical application of poly(ethylene terephthalate) films. Full article
(This article belongs to the Special Issue Interaction of Gaseous Plasma with Polymers and Polymer Composites)
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