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Cutting-Edge Research for Photopolymerization

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Macromolecular Chemistry".

Deadline for manuscript submissions: 30 April 2024 | Viewed by 3526

Special Issue Editors

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Guest Editor
Centre National de la Recherche Scientifique (CNRS), Universite de Haute-Alsace (UHA), UMR 7361, IS2M, 15 Rue Jean Starcky, F-68057 Mulhouse, France
Interests: photopolymerization; photochemistry; polymers and lights; photoinitiators; 3D printing (stereolithography)
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Special Issue Information

Dear Colleagues,

Photopolymers are appealing materials that have now found applications in dentistry, coatings, inks, and adhesives, but also in emerging fields such as 3D and 4D printing. Although photopolymerization was traditionally done in the UV range, recently, a great deal of interest has been devoted to developing visible light photoinitiators, addressing the manipulator safety concerns but also offering a broader variety of structures that can be used as photoinitiators. Parallel to this, with regard to the toxicity concerns raised by the use of transition metals, organic compounds that can act as photoinitiators of polymerization are actively being researched by both the academic and industrial communities. The development of new monomers is also largely reported. New photosensitive resins based on well-selected and developed photoinitiators/monomers/oligomers/additives/fillers are in the heart of many studies. Many new applications (3D/4D printing, composites, biomedical devices) are under development. Researchers in the field are cordially invited to submit relevant manuscripts concerning the development of new photoinitiators, photosensitive resins, and photopolymers for a Special Issue entitled “Cutting Edge Research for Photopolymerization”, within the journal Molecules. Perspectives and reviews in this active research field are also welcome.

Dr. Frédéric Dumur
Prof. Dr. Jacques Lalevee
Guest Editors

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  • Photopolymerization
  • Photopolymers
  • Photoredox catalysis
  • Organic dyes
  • Photoinitiators
  • LED
  • Coatings, inks, composites
  • 3D printing/stereolithography

Published Papers (1 paper)

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16 pages, 1849 KiB  
Synthesis of Epoxy Methacrylate Resin and Coatings Preparation by Cationic and Radical Photocrosslinking
by Paulina Bednarczyk, Izabela Irska, Konrad Gziut and Paula Ossowicz-Rupniewska
Molecules 2021, 26(24), 7663; - 17 Dec 2021
Cited by 7 | Viewed by 2925
This work involves the synthesis of hybrid oligomers based on the epoxy methacrylate resin. The EA resin was obtained by the modification of industrial-grade bisphenol A-based epoxy resin and methacrylic acid has been synthesized in order to develop multifunctional resins comprising both epoxide [...] Read more.
This work involves the synthesis of hybrid oligomers based on the epoxy methacrylate resin. The EA resin was obtained by the modification of industrial-grade bisphenol A-based epoxy resin and methacrylic acid has been synthesized in order to develop multifunctional resins comprising both epoxide group and reactive, terminal unsaturation. Owing to the presence of both epoxy and double carbon–carbon pendant groups, the reaction product exhibits photocrosslinking via two distinct mechanisms: (i) cationic ring-opening polymerization and (ii) free radical polymerization. Monitoring of EA synthesis reactions over time using PAVs, MAAC and NV parameters, and the FT-IR method reveals that esterification reactions proceed faster at the start, exhibiting over 40% of conversion within the initial 60 min, which can be associated with a relatively high concentration of reactive sites and low viscosity of the reaction mixture at the initial reaction stage. With the further increase in the reaction time, the reaction rate tends to decrease. The control of the EA synthesis process can guide how to adjust reactions to obtain EAs with desired characteristics. Based on obtained values, one can state that the optimum synthesis time of about 4–5 h should be adopted to prepare EAs having both epoxy groups and unsaturated double bonds. The structure of the obtained EA was confirmed by FT-IR and NMR methods, as well as the determination of partial acid value and epoxy equivalent. Samples at various stages of synthesis were cured with UV radiation in order to study the kinetics of the process according to cationic and radical polymerization determined via photo-differential scanning calorimetry (photo-DSC) and real-time infrared spectroscopy (RT-IR) and then the properties of the cured coatings were tested. It turned out that the cationic polymerization was slower with a lower conversion of the photoreactive groups, as compared to the radical polymerization. All the obtained EA coatings were characterized by good properties of cured coatings and can be successfully used in the coating-forming sector. Full article
(This article belongs to the Special Issue Cutting-Edge Research for Photopolymerization)
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