Synthesis and thermal properties of thermosetting bis‐benzocyclobutene–terminated arylene ether monomers

Synthesis and properties of fluorinated bis‐benzocyclobutene‐terminated arylene ether monomers

“…All of them demonstrated broad exotherms starting at 225–229°C (extrapolated onset temperature) and reaching the peak temperature at 261–263°C, which was ascribed to the ring opening of BCB group and the subsequent network‐forming reactions. The curing behaviors of these four monomers coincided well with that of the bis‐BCB‐terminated arylene ether monomers developed by Tan et al5…”

“…Benzocyclobutene (BCB)‐based polymers have emerged as a new generation of high‐performance materials for a spectrum of structural and electronic applications due to the versatile reaction chemistry of BCB as well as the combined advantages of processability and material properties 1–6. One important class of them is the BCB resins with highly crosslinked network structures from bis‐BCB monomers containing diverse linking groups, which connects two BCB moieties.…”

“…However, the resin shows mean thermo‐oxidative stability, which is mainly related to the siloxane linking group containing many aliphatic methyl groups 14. In addition, a number of BCB monomers and oligomers from bisphenol A PC, polyethersulfones, and polyetherketones terminated by 4‐hydroxy‐BCB have been prepared 5, 15–18. Although these resins exhibit excellent solvent and ignition resistance, they still have the drawbacks of high dielectric constants and water absorptions because of the highly polar ester groups, sulfone groups and carbonyl groups in the linking groups.…”

Crosslinking Using Rapid Thermal Processing for the Fabrication of Efficient Solution‐Processed Phosphorescent Organic Light‐Emitting Diodes

“…However, in the presence of 2 wt% of a diaryliodonium thermal acid generator (TAG) (Figure 1),15 a complex exothermic event, attributed to acid‐catalyzed CROP crosslinking, is observed between 150 °C and 200 °C on the first cycle, with only a broad glass transition on the second heating cycle. The first DSC scan of TCz II revealed an endothermic melting near 160 °C, followed by a broad exothermic event centered around 270 °C, which, consistent with DSC data for other benzocyclobutene systems,16 was assigned to the crosslinking, while the second scan revealed only a glass transition near 125 °C.…”

Synthesis and characterization of high nitrile content polyimides as dielectric films for electrical energy storage

“…), or simply in molten ZnCl 2 at 400 °C in a sealed tube . Also, it has been shown under thermosetting conditions that aromatic nitrile can readily engage in a Diels‐Alders reaction at lower temperatures with a reactive dienophile such as o ‐quinodimethane generated from benzocyclobutene at ∼200–250 °C . In a related example, poly(ether sulfone) copolymers containing nitrile groups was heated at 350 °C in an inert atmosphere at various time intervals and the FT‐IR spectra showed that there was a gradual decrease in the intensity of the characteristic nitrile peak at 2230 cm −1 with time, indicating that most likely the trimerization reaction was occurring .…”