Synthesis of a smart bisbenzoxazine with combined advantages of bismaleimide and benzoxazine resins and its unexpected formation of very high performance cross-linked polybenzoxazole

Biobased Bisbenzoxazine Resins Derived from Natural Renewable Monophenols and Diamine: Synthesis and Property Investigations

“…On the other hand, P-pa possesses a relatively higher polymerization peak temperature at 236 °C. Nevertheless, the polymerization temperatures observed for these Priamine 1074 diamine-derived bio-bisbenzoxazines are much lower than that of the commercialized bisbenzoxazine based on phenol and 4,4′-diaminodiphenylmethane . In addition, this series of bisbenzoxazines all shows no melting processes, which is due to the lack of crystallinity.…”

“…Nevertheless, the polymerization temperatures observed for these Priamine 1074 diamine-derived bio-bisbenzoxazines are much lower than that of the commercialized bisbenzoxazine based on phenol and 4,4′-diaminodiphenylmethane. 52 In addition, this series of bisbenzoxazines all shows no melting processes, which is due to the lack of crystallinity. The fatty chains derived from Priamine 1074 in each benzoxazine monomer result in an amorphous structure of G-pa, S-pa, and P-pa.…”

Porous structure contained polyimide film with enhanced dielectric properties upon high temperature

“…According to the dielectric theory, the dielectric constant of polymer materials could be reduced through decreasing the molar polarizability and mass density, such as the incorporation of rigid or bulky pendant groups, [19][20][21] insulating nanofillers, [22][23][24] porous structure, [25][26][27][28] and less polarizable groups such as C H, C F, C Si, and C C bonds. [29][30][31] The introduction of porous structure can incorporate large amount of air, which has the lowest dielectric constant of 1, into the polymer material, combined with the scaling down of dipole density, thus greatly reduce the dielectric constant of polymer materials. [32][33][34][35] Aerogels and foams with high porosity were the mostly constructed porous structures which help to decrease the dielectric constant of polymer materials.…”

Synthesis, polymerization, and thermal properties of novel oxazine‐functional bismaleimides and their conversion to high performance benzoxazole resins

“…Further, the side group contained an oxazine ring and a nitrile group at the ortho or para position of the side benzene ring. These novel ortho‐oxazine functionalized bismaleimide resins not only exhibit high thermal stability, but the resulting polymers can also undergo structural transformation at high temperature 32–35 . Compared to the traditional method of benzoxazole synthesis, this intelligent method of converting the structure to obtain high heat‐resistant polybenzoxazole resin also offers other advantages, such as good design of molecular flexibility, does not require a strong acid, and ease of processing.…”