Fecha de publicación: 14/11/2024 Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE The upper part of this picture describes the fabrication and recycling process of dual-cured epoxy resin, supplemented by the formation of an interpenetrating network and the principle of ester exchange reactions. The bottom three figures describe the performance recovery effect of the mechanical properties and breakdown strength of the dual-cured epoxy resin under different recycling conditions.


Abstract
The difficult recycling and degradation in cured epoxy resins can be solved by introducing dynamic covalent bonds. However, the introduction of dynamic bonds degrades the properties of epoxy resins. In this paper, the dual-cured epoxy resin with high mechanical properties and high healing efficiency were obtained by constructing interpenetrating networks (IPNs). The effect of IPNs on the recyclability of epoxy resins was investigated. The performance is as follows, the flexural and tensile strengths is 89 and 54.2 MPa, respectively, and the breakdown strength is 32.5 kV/mm. In addition, the recyclability and high healing efficiency of the dual-cured epoxy resin were verified, and the effect of the hot-pressing temperature and time on the properties of the recycled samples were investigated. Under certain hot-pressing conditions, the flexural and tensile strengths of the recycled samples were recovered to 95.06% and 85.28%, respectively, and the breakdown strength was recovered to 83.6%.