Epoxy adhesives have found extensive application in the fields of aerospace, automotive, and electronics industries due to their excellent mechanical properties, bond strength, and thermal stability. However, the cured epoxy adhesive forms three-dimensional (3D) cross-linked networks, which makes debonding challenging and cannot meet the requirements of temporary positioning, recycling, and reuse of precision parts particularly in the electronic devices area. The incorporation of dynamic networks into adhesives is an effective approach to achieving debonding. In this study, a series of anthracene-modified debonding epoxy adhesives were successfully synthesized using anthracene-9-ylmethyl 3-mercaptopropanoate (ANSH) and N,N-diglycidyl-4-glycidyloxyaniline (AFG-90H) by epoxy–thiol “click reaction” under Et3N conditions. The adhesive undergoes a synergistic curing process involving a [4π + 4π] cycloaddition reaction and epoxy self-curing under light and heat conditions (365 nm UV-light irradiation and 65 °C), resulting in optimal bonding with an excellent shear strength of 2.01 ± 0.14 MPa. Moreover, it is capable of breaking the covalent bonds of the anthracene dimers at milder heat stimulation (120 °C), with a debonding rate of up to 87%. The findings offer a promising avenue for the development of a debonding epoxy adhesive.
Integration of high quantum yield blue emission and easy film-forming ability in organic emissive materials is challenging. Polycarbosilane (PCS) has received much attention as a model compound owing to its high stability, versatile optical properties, solvability, and film-forming ability; also, anthracene as a star material is the first organic molecule for electroluminescence (EL) devices. Herein, an ingenious strategy was successfully introduced to prepare PCSx with 9-ethylanthracene (referred as 9-EA-PCSx) by a hydrosilylation reaction using 9-vinylanthracene and PCS as starting materials, which transfer efficient energy from −Si–C– bonds to anthracene units. Grafted 9-ethylanthracene with extended π-conjugation effectively improves optical property, morphological stability, and oxidation and ultraviolet (UV) radiation resistance of PCS. Particularly, 9-EA-PCSh powder displays excellent blue light emission (λmax = 433 nm) with a high quantum yield (up to 80.06%), which is the highest value ever reported for organosilicon polymers to the best of our knowledge. For the first time, such a synergistic effect of PCS with anthracene in this way paves a practical way toward reliable emissive materials capable of forming facile coatings and providing useful low-cost emitting layers in developing foldable organic devices.
危险品化学品经营许可证（带存储）