Benzoxazines are a modern class of monomers which have aroused great interest in the scientific and industrial scenarios due to their remarkable properties. Nevertheless, few is known about the influence of position 2 of the oxazine ring upon its polymerization. Here, we report for the first time, the introduction of natural-occurring aldehydes (valeraldehyde and benzaldehyde) in the oxazine ring of bio-based benzoxazines. The chemical structures of the monomers were confirmed by different spectroscopic techniques and their thermal stabilities were evaluated by thermogravimetric analysis (TGA). The influence of the chemical nature of the substituents on the polymerization behavior was investigated by differential scanning calorimetry (DSC), applying Kissinger, Flynn-Wall-Ozawa and Crane methods to determine the Arrhenius parameters of the studied systems. Results presented that 2-substituted benzoxazines have lower activation energy values and polymerization temperatures compared to the corresponding unsubstituted benzoxazine, reinforcing the potential of this class of compounds in developing tailor-made polymers due to its structural versatility.
Influence of natural substituents in the polymerization behavior of novel bio-based benzoxazines
Mele G.Membro del Collaboration Group
;
2019-01-01
Abstract
Benzoxazines are a modern class of monomers which have aroused great interest in the scientific and industrial scenarios due to their remarkable properties. Nevertheless, few is known about the influence of position 2 of the oxazine ring upon its polymerization. Here, we report for the first time, the introduction of natural-occurring aldehydes (valeraldehyde and benzaldehyde) in the oxazine ring of bio-based benzoxazines. The chemical structures of the monomers were confirmed by different spectroscopic techniques and their thermal stabilities were evaluated by thermogravimetric analysis (TGA). The influence of the chemical nature of the substituents on the polymerization behavior was investigated by differential scanning calorimetry (DSC), applying Kissinger, Flynn-Wall-Ozawa and Crane methods to determine the Arrhenius parameters of the studied systems. Results presented that 2-substituted benzoxazines have lower activation energy values and polymerization temperatures compared to the corresponding unsubstituted benzoxazine, reinforcing the potential of this class of compounds in developing tailor-made polymers due to its structural versatility.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
