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 Polymers. Perspectives and reviews in this active research field are also welcome.