Abstract
Click chemistry has emerged as an effective polymerization method to obtain thermosets with enhanced properties for advanced applications. In this article, commonly used click reactions have been reviewed, highlighting their advantages in obtaining homogeneous polymer networks. The basic concepts necessary to understand network formation via click reactions, together with their main characteristics, are explained comprehensively. Some of the advanced applications of thermosets obtained by this methodology are also reviewed.
Highlights
The development of novel thermosets with requirements of high mechanical and thermal performance for new technologies has moved researchers to incorporate new chemical processes into the preparation of these polymeric materials
Considering the concept proposed by Sharpless [1], click reactions have been utilized over the last few decades as polymerization systems to form new thermosetting materials with enhanced characteristics to meet the demands of the industry
The transformations taking place during a curing process may be conveniently represented in conversion-time-temperature (CTT) and time-temperature-transformation (TTT) diagrams, which are used to identify the states in the processing of a thermoset [10,15]
Summary
The development of novel thermosets with requirements of high mechanical and thermal performance for new technologies has moved researchers to incorporate new chemical processes into the preparation of these polymeric materials. As mentioned, canneed take place, and the network structure (if monomers any) or molecular architecture obtained, largely we to include in the reaction mixture or crosslinking agents with adepend functionality on the conditions process and on the feed ratio of thewe monomers. We can ratio crosslinked material with a tailored structure that can be subject to a postfunctionalization process or and functionality of monomers with the intention of producing soluble, high molecular weight and a second polymerization reaction that is triggered under controlled conditions. The molecular and network build-up process is accompanied by an increase in the glass transition temperature of the system, T g This reflects a reduction in mobility due to (a) the decrease in chain-ends caused by the formation of covalent bonds during the reaction, and (b) the reduction in configurational entropy caused by the growing presence of crosslinks in the network structure [14].
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