Ribas-Massonis Aina, Cicujano Magalí, Duran Josep, Besalú Emili, Poater Albert
Department of Chemistry, Institute of Computational Chemistry and Catalysis, University of Girona, c/Maria Aurèlia Capmany 69, 17003 Girona, Spain.
Roberlo S.A., Ctra. N-II, km 706,5, Riudellots de la Selva, 17457 Girona, Spain.
Polymers (Basel). 2022 Jul 13;14(14):2856. doi: 10.3390/polym14142856.
Even though there are many photocurable compositions that are cured by cationic photopolymerization mechanisms, UV curing generally consists of the formation of cross-linking covalent bonds between a resin and monomers via a photoinitiated free radical polymerization reaction, obtaining a three-dimensional polymer network. One of its many applications is in the refinish coatings market, where putties, primers and clear coats can be cured faster and more efficiently than with traditional curing. All these products contain the same essential components, which are resin, monomers and photoinitiators, the latter being the source of free radicals. They may also include additives used to achieve a certain consistency, but always taking into account the avoidance of damage to the UV curing-for example, by removing light from the innermost layers. Surface curing also has its challenges since it can be easily inhibited by oxygen, although this can be solved by adding scavengers such as amines or thiols, able to react with the otherwise inactive peroxy radicals and continue the propagation of the polymerization reaction. In this review article, we cover a broad analysis from the organic point of view to the industrial applications of this line of research, with a wide current and future range of uses.
尽管有许多可光固化的组合物是通过阳离子光聚合机制固化的，但紫外线固化通常是通过光引发的自由基聚合反应在树脂和单体之间形成交联共价键，从而获得三维聚合物网络。其众多应用之一是在修补漆市场，在该市场中，腻子、底漆和面漆的固化比传统固化更快、更高效。所有这些产品都含有相同的基本成分，即树脂、单体和光引发剂，后者是自由基的来源。它们还可能包括用于达到一定稠度的添加剂，但始终要考虑避免对紫外线固化造成损害——例如，通过去除最内层的光线。表面固化也有其挑战，因为它很容易被氧气抑制，不过这可以通过添加清除剂（如胺或硫醇）来解决，这些清除剂能够与原本不活泼的过氧自由基反应并继续聚合反应的传播。在这篇综述文章中，我们涵盖了从有机角度到该研究领域工业应用的广泛分析，包括当前和未来广泛的用途。
