A simple and versatile photothermal dual-curing system design based on phytophenol derivatives and thiol chemistry for potential electronic encapsulant application

Given the diversity of thiol chemistry, researchers are actively exploring its potential as a versatile compound. This paper presents the synthesis of three bio-based multifunctional monomers (EPMG, EPBEG, EPBEF) containing allyl and epoxy groups using phytophenols (magnolol and eugenol) as raw materials. Photothermal dual curing was performed using pentaerythritol tetrakis(3-mercaptopropionate) (PETMP). Comprehensive studies and comparisons of the cured systems were conducted, including curing kinetics, mechanical properties, dielectric properties, and transmittance. The effect of the curing sequence was systematically investigated. The results demonstrate that as the curing proceeds, the mechanical properties and glass transition temperature (Tg) of the material improve significantly, and the dual curing process exhibits excellent bonding, dielectric, and ultraviolet (UV) shielding performance. Moreover, the differences in monomer structure (methoxy, benzene ring connection) also impact the properties of the monomers and the performance of the material. This work provides a novel approach to designing epoxy monomer structures and developing bio-based single-component dualcuring systems. This thiol-mediated dual-curing system has potential applications in electronic materials and personal protective equipment can contribute to achieving miniaturization, precision, and integration in various applications.