Abstract
A series of biobased benzoxazine oligomers suitable for vacuum-assisted resin transfer molding (RTM) were prepared from eugenol derivatives, furfurylamine, diamine, and paraformaldehyde. After the structures of these oligomers were identified by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (1H NMR and 13C NMR), their curing behaviors and processability were evaluated by differential scanning calorimetry, FT-IR, and rheological tests. Results showed that the oligomers had stable viscosity lower than 1 Pa·s in the temperature range from 60 to 190 °C, and their processing window was found to be wider than 160 °C. The cured resins exhibited excellent thermal properties (10% thermal weight loss at 406 °C and glass transition temperature greater than 110 °C), good hydrophobic performance, and low moisture absorption. The benzoxazine oligomers reported here demonstrated great potential in the fabrication of composites, especially the green composites via more effici...
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