Melamine modified phthalonitrile resins: Synthesis, polymerization and properties

Improved curing reactivity, thermal resistance and mechanical properties of furylamine‐based benzoxazine using melamine as an amine source

“…Moreover, the characteristic absorption peak of furan ring (735 cm −1 ) can also be observed 11 . With the increase of melamine proportion, the intensity of the peak at 3350 cm −1 4 assigning to active groups like phenol hydroxyls and amino groups gradually increased, as is the case for the intensity of triazine ring absorption at 1560 cm −1 . On the contrary, the peak intensity of furan ring and benzoxazine ring gradually weakened, which indicated that melamine was involved in the reaction and hindered ring‐closure of benzoxazine, and as a consequence, more active functional groups such as phenolic hydroxyls and amino groups were remained in the precursors.…”

“…Benzoxazine resin, as a relatively new thermosetting resin, is known to possess some intriguing properties such as chemical resistance, low flammability, high thermal stability, high modulus and strength, good dielectric properties, zero shrinkage 1 and no small molecules release in the process of ring‐opening polymerization 2–5 . These merits impart it high potential to be applied in areas like printed circuit board, 6 aerospace, 7,8 electronic packaging 9 .…”

Study on Silicon-Containing Main Chain Type Polybenzoxazines with Both High Heat Resistance and Low Dielectric Constant

“…Chen et al prepared a series of main chain type benzoxazines based on diamines and bisphenols, and a high glass transition temperature ( T g ) of 226 °C was obtained for p - tert -butylphenol-modified main chain type polybenzoxazine. In addition, another method of improving the heat resistance is introducing reactive functional groups like aldehyde, alkynyl, , and cynao , groups and furan rings . Among them, alkynyl groups can form new aromatic rings and increase the cross-linking density under high temperature, which greatly improves the heat resistance of polymers.…”

Optimizing the dielectric and mechanical properties of melamine based‐benzoxazine resin by copolymerizing with epoxy resin

“…Various amines, phenols and aldehydes originated from both biomass and petroleum can be used as raw materials to synthesize benzoxazines, offering excellent molecular design flexibility. 7 Nevertheless, shortcomings such as high curing temperature, 8 brittleness, 9 and low crosslinking density are the main obstacles that hampers the wide application of benzoxazines. 10 To overcome these drawbacks, incorporation of the additional functional groups in benzoxazine structure such as hydroxyl, amine as well as alkynyl 11 to modify structure, 12 on other hand, blending with resin containing excellent performance 13 is also a great choice like bismaleimide, 14 cyanate ester, 15 and so on.…”