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Coatings
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Light-Curable Coatings
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Light-Curable Coatings

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 20284

Special Issue Editor

Prof. Dr. Igor V. Khudyakov

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Guest Editor
1. Department of Chemistry, Columbia University, New York, NY 10027, USA
2. PCI Laboratories, Bangor, PA 18013, USA
Interests: fast photopolymerization; coatings; magnetic filed effects in chemical reactions; free radicals reactivity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photopolymerization is an efficienet way of curing coatings. UV-curing of coatings has been studied for at least half a century. A vast amount of data has been accumulated on curing, and is available in the scientific and technical literature. Practitioners often sucessfully select their fomulations, meeting the required properties of the cured coating. DOE or other techniques are very helpful in practical work.

At the same time, there is a blank area between the properties of liquid coatings and those of cured coatings. Understanding the evolution of a formualtion during curing would greatly help the selection of formulation ingredients and of the conditions of curing. It is not clear how photoinduced curing of extremely hard coatings or of hard filling dental materials occur.

There is a demand for coatings cured using visible- and IR-light, coatings sensitive to ambient indoors light with low irradiance (“light intensity”) and fluence (“dose”). Ambient light allows DIY users curing the repair products in house in a timely fashion.

On the other hand, requirements for extremely fast curing are of great practical interest.

Examples of essential external magnetic field effects on photopolymerization are valuable.

The goal of this Special Issue is to present recent achievements in the area of light-cured coatings. We welcome recent studies on free-radical, cationic, and anionic photopolymerization.  We expect that the Special Issue will be focused on an understanding of problems related to photopolymerization rather than a collection of reports on UV- or visible light curing with new photoinitiators.

In particular, the topics of interest include, but are not limited to:

  • Kinetics of phtopolymerization initiated by UV-, Vis-, and IR-light
  • Study of the structure of coatings during photopolymerization
  • Nanopartical and nanoclay effects on the properties of cured coatings
  • Kinetics of anionic curing of cyanoacrylates

Prof. Dr. Igor V. Khudyakov
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. Coatings is an international peer-reviewed open access monthly 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.

Published Papers (5 papers)

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Research

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10 pages, 2029 KiB  
Article
UV-Cured Biodegradable Methacrylated Starch-Based Coatings
by Camilla Noè, Chiara Tonda-Turo, Irene Carmagnola, Minna Hakkarainen and Marco Sangermano
Coatings 2021, 11(2), 127; https://doi.org/10.3390/coatings11020127 - 23 Jan 2021
Cited by 5 | Viewed by 3891
Abstract
Promising UV-curable starch-based coatings were fabricated by utilizing methacrylated starch. The aqueous methacrylated starch solution was cast on a glass substrate, and UV-cured after drying. The efficiency of UV-curing process was monitored with gel percentage measurements. The thermal and mechanical properties of the [...] Read more.
Promising UV-curable starch-based coatings were fabricated by utilizing methacrylated starch. The aqueous methacrylated starch solution was cast on a glass substrate, and UV-cured after drying. The efficiency of UV-curing process was monitored with gel percentage measurements. The thermal and mechanical properties of the fabricated UV-cured coatings were investigated through differential scanning calorimetry and tensile test and compared with the starch-based uncured casted coatings. A complete characterization of the surface properties was performed by means of pencil hardness, adhesion, solvent resistance, and surface tension measurements. The cross-linking by UV-curing significantly enhanced the mechanical and surface properties of the coating. The effect of UV-curing on the biodegradability of the coating was evaluated by following the enzymatic degradation by α-amylase by determining the amount of glucose and maltose released from the coatings. UV-cured methacrylated starch based coating with promising material and surface properties and retained biodegradation potential was demonstrated. Full article
(This article belongs to the Special Issue Light-Curable Coatings)
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13 pages, 2328 KiB  
Article
Thermal Initiators as Additives for Photopolymerization of Methacrylates upon Blue Light
by Aude-Héloise Bonardi, Soraya Zahouily, Céline Dietlin, Bernadette Graff, Frédéric Dumur, Malika Ibrahim-Ouali, Didier Gigmes and Jacques Lalevée
Coatings 2020, 10(5), 478; https://doi.org/10.3390/coatings10050478 - 15 May 2020
Cited by 9 | Viewed by 4387
Abstract
Free radical polymerization is often performed by thermal initiation but also more and more by light-assisted polymerization processes. This second approach allows the polymerization to be carried out under mild conditions (under air, upon blue light exposure, under low light intensity). The aim [...] Read more.
Free radical polymerization is often performed by thermal initiation but also more and more by light-assisted polymerization processes. This second approach allows the polymerization to be carried out under mild conditions (under air, upon blue light exposure, under low light intensity). The aim and the originality of the present paper is to perform photopolymerization in the presence of a thermal initiator, i.e., we can take advantage of the exothermicity of the photopolymerization process to decompose the thermal initiator, leading to enhanced polymerization rates. The performance of the photoinitiating system is discussed in the present study based on real-time Fourier-transform infrared spectroscopy measurements (following the C=C bond content evolution vs. time) and by thermal imaging experiments. Mechanisms of the new system proposed in this work are also fully detailed using cyclic voltammetry, electron spin resonance (ESR) spin trapping, and UV-visible absorption properties. Full article
(This article belongs to the Special Issue Light-Curable Coatings)
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13 pages, 3067 KiB  
Article
Compositionally Graded Hydrophobic UV-Cured Coatings for the Prevention of Glass Stress Corrosion
by Sara Dalle Vacche, Gregorio Mariggiò, Alessandra Vitale, Roberta Bongiovanni and Mauro Corrado
Coatings 2019, 9(7), 424; https://doi.org/10.3390/coatings9070424 - 04 Jul 2019
Cited by 5 | Viewed by 4209
Abstract
The use of glass in architecture is growing and is moving towards structural applications. However, the tensile strength of glass cannot be fully exploited because of stress corrosion. This is a corrosion triggered by stress applied to the material and dependent on environmental [...] Read more.
The use of glass in architecture is growing and is moving towards structural applications. However, the tensile strength of glass cannot be fully exploited because of stress corrosion. This is a corrosion triggered by stress applied to the material and dependent on environmental factors such as humidity and temperature. To protect glass from stress corrosion, we developed a UV-cured coating, characterized by hydrophobicity, barrier to water vapor properties, and good adhesion to glass, thanks to a compositional profile. The coating was obtained by combining a cycloaliphatic diacrylate resin with a very low amount of a perfluoropolyether methacrylate co-monomer, which migrated to the free surface, creating a compositionally graded coating. The adhesion to glass was improved, using as a primer an acrylated silane able to co-react with the resins. With a mechanical load test using the coaxial double ring set-up, we proved that the coating is effective in the inhibition of stress corrosion of glass plates, with an increase of 76% of tensile strength. Full article
(This article belongs to the Special Issue Light-Curable Coatings)
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13 pages, 4207 KiB  
Article
Preparation and Properties of High Hardness Ultraviolet Curable Polyethylene Terephthalates Surface Coatings Modified with Octavinyl-Polyhedral Oligomeric Silsesquioxane
by Tianmiao Kang, Liuyan Tang and Jinqing Qu
Coatings 2018, 8(11), 411; https://doi.org/10.3390/coatings8110411 - 20 Nov 2018
Cited by 8 | Viewed by 4090
Abstract
Using organic coatings helps to protect PET (polyethylene terephthalates) surfaces, improve surface hardness, scratch resistance, and solvent resistance, prolong the service life of PET film, and to expand their scope of applications. There were some disadvantages, including poor flexibility and impact resistance in [...] Read more.
Using organic coatings helps to protect PET (polyethylene terephthalates) surfaces, improve surface hardness, scratch resistance, and solvent resistance, prolong the service life of PET film, and to expand their scope of applications. There were some disadvantages, including poor flexibility and impact resistance in high-hardness coatings; organic coatings should also be modified to improve the toughness. Herein, a UV (ultraviolet curing) curable high-hardness organic coating used in PET surface protection was prepared and modified with inorganic nanoparticles, such as OVPOSS (octavinyl-polyhedral oligomeric silsesquioxane). The effects of the categories of nanoparticles on the coating performance were studied. UV-Vis spectra (ultraviolet visible light spectra), FT-IR (Fourier transform infrared spectrometer), TGA (thermogravimetric analysis), DMA (dynamic-mechanical), SEM (field emission scanning electron microscope), and AFM (atomic force microscope) were used to characterize the properties of the coatings. The results showed that the addition of eight-vinyl POSS to the organic coating significantly increased its glass transition temperature (Tg) from 100 to 120 °C, improved its storage modulus from 167.6 to 258.9 MPa, and raised its impact resistance and flexibility. The SEM and AFM images displayed that the eight-vinyl POSS particles were dispersed homogeneously in the coating, arranged in an ordered network, and had good compatibility with organic components. The film displayed excellent properties, including 4 H of the pencil hardness, 100 g cm of impact resistance, excellent flexibility, and 90% of light transmittance, with the addition of 0.3 wt % OVPOSS. TGA analysis revealed that the coating had good thermal stability, with 5% weight loss temperature up to 335 °C. Full article
(This article belongs to the Special Issue Light-Curable Coatings)
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Review

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13 pages, 2801 KiB  
Review
Cage Effect under Photolysis in Polymer Matrices
by Igor V. Khudyakov, Peter P. Levin and Aleksei F. Efremkin
Coatings 2019, 9(2), 111; https://doi.org/10.3390/coatings9020111 - 12 Feb 2019
Cited by 6 | Viewed by 3068
Abstract
Photoinduced elementary reactions of low-MW compounds in polymers is an area of active research. Cured organic polymer coatings often undergo photodegradation by free-radical paths. Besides practical importance, such studies teach how the polymer environment controls elementary free-radical reactions. Presented here is a review [...] Read more.
Photoinduced elementary reactions of low-MW compounds in polymers is an area of active research. Cured organic polymer coatings often undergo photodegradation by free-radical paths. Besides practical importance, such studies teach how the polymer environment controls elementary free-radical reactions. Presented here is a review of recent literature which reports such studies by product analysis and by a time-resolve technique of photochemical reaction inside the cage of a polymer and in the bulk of a polymer. It was established that application of moderate external magnetic field allows the control of the kinetics of free radicals in elastomers. Preheating and stretching of elastomers affect reactivity of photoproduced radicals. Full article
(This article belongs to the Special Issue Light-Curable Coatings)
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