Structural effects of highly π-conjugated mesogenic Schiff-base moiety on the cationic polymerization of benzoxazine and formation of ordered morphologies

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

“…Other reactive functionalities, such as propargyl [ 185 , 186 , 187 ], epoxide [ 188 , 189 ], oxyalcohol [ 190 ] and amino [ 191 ] groups, are also incorporated in benzoxazine structures to impart additional crosslinks or other related benefits due to ease of structural control at the molecular level. Interestingly, aldehyde-containing benzoxazine, upon modification to a Schiff base, enables its applicability to sequester metals ions [ 192 ].…”

“…Compared with BA-a, the bis-benzoxazine containing Schiff base linkages forms aligned chain segments requiring higher energy to facilitate the polymerization due to π-π stacking. This restricts the motion of oxazine rings, leading to less involvement of oxazine rings in polymerization and, therefore, resulting in lower ∆H values [192]. Incorporation of rigid spacer units, trimethylphenyl indane and tetramethyl spirobiindane between the reactive benzoxazine units, leads to mobility restriction imposed on the reactive sites by the increasing viscosity of the polymerizing medium, affecting the polymerization rate [401].…”

Degradable Schiff base benzoxazine thermosets with high glass transition temperature and its high‐performance epoxy alloy: Synthesis and properties

“…1,2,4 To introduce a Schiff-base into the benzoxazine structure, the Schiff-base structure is generally embedded in the corresponding phenol first, then, the target resin is synthesized via the Mannich reaction. 38 However, in actual experiments, during this reaction, the Schiff-base of the corresponding phenol reacts with the amine to produce a new Schiff-base and a new amine upon heating. 37,[39][40][41] The exchange reaction of the Schiff-base makes the composition of the reaction product complex, with failure to obtain a high-purity product.…”

Optically Active Microspheres Containing Schiff Base: Preparation and Enantio-Differentiating Release toward Drug Citronellal

“…The applications of Schiff bases have received ever-increasing attention because the characteristic chemical bond [−(CN)−] has excellent ion coordinative capability , and pH-responsive ability . Schiff bases and their derivatives have been widely used for developing catalyst intermediates, , biological sterilizations, , fluorescent reagents, , self-assembled polymers, , and polymer stabilizers . More recently, it was reported that Schiff bases can be used as electrodes for batteries and used to prepare metal–organic frameworks (MOFs) , and covalent organic frameworks (COFs) .…”

“…3 Schiff bases and their derivatives have been widely used for developing catalyst intermediates, 4,5 biological sterilizations, 6,7 fluorescent reagents, 8,9 self-assembled polymers, 10,11 and polymer stabilizers. 12 More recently, it was reported that Schiff bases can be used as electrodes for batteries 13 and used to prepare metal−organic frameworks (MOFs) 14,15 and covalent organic frameworks (COFs). 16 In brief, Schiff bases have been taken as a versatile platform by scientists from diverse disciplines to develop new architectures and materials for respective targets.…”