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Recent Advances in Photocatalysts for Polymerization Reaction

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

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 11586

Special Issue Editors


E-Mail Website1 Website2
Guest Editor
Faculté des Sciences, Aix-Marseille Université, CNRS, ICR UMR 7273, F-13397 Marseille, France
Interests: photopolymerization; photoinitiators; metal complexes; organic chemistry
Special Issues, Collections and Topics in MDPI journals

E-Mail Website1 Website2
Guest Editor
Aix-Marseille University, Marseille, France
Interests: photopolymerization; luminescent materials; organic and organometallic chemistry

Special Issue Information

Dear Colleagues,

With the emphasis on resource and energy conservation as well as environmental issues, there has been a move towards polymerization processes that can be carried out under safer conditions. These issues can be addressed using photopolymerization. Recently, photoredox catalysis initially developed for organic chemistry have been applied to the synthesis of photopolymers. Using this approach, a drastic reduction of the photoinitiator content could be achieved, resulting in the possibility to regenerate the photoinitiator in situ. Using this appealing approach, low amounts of initiators are sufficient to initiate a polymerization reaction while maintaining high conversion rates and fast polymerization processes.

Researchers in the field are cordially invited to submit relevant manuscripts concerning the development of new photocatalysts of polymerization for a Special Issue entitled  ‘Recent Advances in Photocatalysts for Polymerization Reaction’, within the journal Molecules. Perspectives and reviews in this active research field are also welcome.

Dr. Frédéric Dumur
Dr. Guillaume Noirbent
Guest Editors

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. Molecules 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 2700 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

  • Photopolymerization;
  • Photocatalysis;
  • Photoredox catalysis;
  • Photoinduced electron transfer;
  • Photoinitiated reaction;
  • Green synthesis;
  • Visible light;
  • Organocatalysis.

Published Papers (2 papers)

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Research

18 pages, 7869 KiB  
Article
New Donor-Acceptor Stenhouse Adducts as Visible and Near Infrared Light Polymerization Photoinitiators
by Guillaume Noirbent, Yangyang Xu, Aude-Héloise Bonardi, Sylvain Duval, Didier Gigmes, Jacques Lalevée and Frédéric Dumur
Molecules 2020, 25(10), 2317; https://doi.org/10.3390/molecules25102317 - 15 May 2020
Cited by 20 | Viewed by 5349
Abstract
Polymerization photoinitiators that can be activated under low light intensity and in the visible range are being pursued by both the academic and industrial communities. To efficiently harvest light and initiate a polymerization process, dyes with high molar extinction coefficients in the visible [...] Read more.
Polymerization photoinitiators that can be activated under low light intensity and in the visible range are being pursued by both the academic and industrial communities. To efficiently harvest light and initiate a polymerization process, dyes with high molar extinction coefficients in the visible range are ideal candidates. In this field, Donor-acceptor Stenhouse Adducts (DASA) which belong to a class of recently discovered organic photochromic molecules still lack practical applications. In this work, a series of DASA-based dyes are proposed as photoinitiators for the free radical polymerization of (meth)acrylates upon exposure to a near infrared light (laser diode at 785 nm). Full article
(This article belongs to the Special Issue Recent Advances in Photocatalysts for Polymerization Reaction)
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13 pages, 2282 KiB  
Article
Design of Iodonium Salts for UV or Near-UV LEDs for Photoacid Generator and Polymerization Purposes
by Ségolène Villotte, Didier Gigmes, Frédéric Dumur and Jacques Lalevée
Molecules 2020, 25(1), 149; https://doi.org/10.3390/molecules25010149 - 30 Dec 2019
Cited by 48 | Viewed by 5609
Abstract
Iodonium salts are well established photoacid generators, cationic photoinitiators, as well as additives commonly used in photoredox catalytic cycles. However, as a strong limitation, iodonium salts are characterized by low light absorption properties for λ > 300 nm so that these latter cannot [...] Read more.
Iodonium salts are well established photoacid generators, cationic photoinitiators, as well as additives commonly used in photoredox catalytic cycles. However, as a strong limitation, iodonium salts are characterized by low light absorption properties for λ > 300 nm so that these latter cannot be activated with cheap, safe, and eco-friendly near UV or even visible light emitting diodes (LEDs). To overcome this drawback, the covalent linkage of an iodonium salt to a chromophore absorbing at longer wavelength is actively researched. With aim at red-shifting the absorption spectrum of the iodonium salt, the synthesis of new compounds combining within a unique chemical structure both the chromophore (here the naphthalimide scaffold) and the iodonium salt is presented. By mean of this strategy, a polymerization could be initiated at 365 nm with the modified iodonium salts whereas no polymerization could be induced with the benchmark iodonium salt i.e., Speedcure 938 at this specific wavelength. To examine the effect of the counter-anion on the photoinitiating ability of these different salts, five different counter-anions were used. Comparison between the different anions revealed the bis(trifluoromethane)sulfonimide salt to exhibit the best photoinitiating ability in both the free radical polymerization of acrylates and the cationic polymerization of epoxides. To support the experimental results, molecular orbital calculations have been carried out. By theoretical calculations, the initiating species resulting from the photocleavage of the iodonium salts could be determined. The cleavage selectivity and the photochemical reactivity of the new iodoniums are also discussed. Full article
(This article belongs to the Special Issue Recent Advances in Photocatalysts for Polymerization Reaction)
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