The extended use of benzoxazine in chitosan applications is limited due to its insoluble nature in eco-friendly solvents. Previously we reported synthesis of chitosan/benzoxazine blend polymers and films. Herein, benzoxazine-functionalized chitosan has been investigated. Two different aldehydes-terminal benzoxazine monomers have been synthesized from the condensation reaction of polyetheramines (D-400 and T-403), paraformaldehyde and p-hydroxybenzaldehyde as phenolic component. The feature of aldehyde terminal groups in the structure of this class of monomers facilitates the functionalization with polymers containing primary amine moieties, such as chitosan. The networks poly(benzoxazine-g-chitosan) thermosets have been synthesized via azomethine reaction based on imine-linkage formation. The structures of the polymers have been characterized by nuclear magnetic resonance spectroscopy (1H-NMR) and Fourier transform infrared spectroscopy (FT-IR). The effect of imine-linkage type agents on the ring-opening polymerization of benzoxazine has been evaluated by differential scanning calorimetry (DSC). The thermal properties of the cross-linked polymers have been studied by thermogravimetric analysis (TGA).

Poly(benzoxazine-g-chitosan): A new approach for polybenzoxazine/biopolymer thermosetting resins via imine-linkage formation

246th National Meeting (2013)

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