Synthesis, characterization, and properties of a novel aromatic ester-based polybenzoxazine

Abstract

A novel benzoxazine monomer contain ester group was obtained by an indirect molecular design method. Its polymer showed excellent flexibility.

Lignin-Based Water-Soluble Polymers Exhibiting Biodegradability and Activity as Flocculating Agents

“…The crosspeaks of K 1 and K 7 represent methylene linkages connecting the α-aminoand ε-amino groups of L-lysine, respectively, to the aromatic rings in lignin, and their presence indicates that both amino groups in L-lysine participate in the Mannich reaction. The NMR spectra for K-pine (Figure 3b) and K-corn stover (Figure 3f) also include the cross-peaks characteristic of benzoxazines, 51,52 B α , as shown in green. These heterocyclic structures can be produced from the condensation of the amino groups of the grafted L-lysine, aromatic hydroxyl groups, and residual, unreacted formaldehyde.…”

Ring Opening Polymerization Used for the Production of VOC Free High-Performance Ecofriendly Novel PBZ/PDA/CeO2 Nanocomposites

“…Polybenzoxazines (PBZ)s are an innovative category of materials belonging to high-performance engineering thermosets, which do not produce volatile organic compounds (VOC)s during production and remain stable in harsh physical conditions, e.g., heat treatments [ 1 , 2 , 3 ]. Recently, PBZs exhibited good flame retardancy, easy processability, good flexibility, low dielectric constant, and water absorption properties due to the designed structures [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. The difference between the phenolic family and the polybenzoxazine macromolecules from structural features is that the phenolic molecules are bonded through the methylene (-CH2-) linkages, while the polybenzoxazine molecules are linked via the formation of benzene rings [ 11 ].…”

Synthesis, Dynamic Mechanical Properties, and Shape Memory Effect of Poly(benzoxazine‐ether‐urethane)s

“…Alternatively, another synthetic strategy is to convert mono‐functional benzoxazines into bi‐functional benzoxazines by coupling reaction, but mono‐functional benzoxazines must contain reactive functional groups that facilitate coupling reactions between each pair of mono‐functional benzoxazines and coupling agents. In this way, several bi‐functional benzoxazines were respectively synthesized by amidation reaction of a primary amine‐containing mono‐functional benzoxazine with isophthaloyl dichloride, [13,14] by esterification reaction of a mono‐functional hydroxyl‐containing benzoxazine with terephthaloyl dichloride, [15] by nucleophilic addition−elimination reaction of a mono‐functional hydroxyl‐containing benzoxazine with octafluorocyclopentene, [8] by hydrosilylation of a mono‐functional o ‐allylphenol‐based benzoxazine with 1,1,3,3‐tetramethyldisiloxane, [16] and by imidization reaction of a benzaldehyde‐containing mono‐functional benzoxazine with an amine‐terminated polyether, [17] and a tri‐functional benzoxazine was prepared through isocyanate–hydroxyl reaction of a mono‐functional isocyanate‐containing benzoxazine with glycerol [18] …”