posted on 2019-10-09, 13:35authored byWanling Shi, Xun Zhang, Yan Ji, Zhuxuan Zhao, Weizhi Li, Xudong Jia
A series
of new biobased benzoxazine monomers were synthesized
by reacting amino acid methyl ester and disphenolic acid methyl ester/eugenol
(E) with paraformaldehyde by Mannich condensation reaction. The chemical
structures of these biobenzoxazine monomers were characterized by 1H NMR, 13C NMR, mass spectrum, and Fourier transform
infrared (FTIR). Their curing behaviors were examined by differential
scanning calorimetry (DSC) and FTIR spectroscopy. Thermogravimetric
analysis was utilized to evaluate the thermal stability of the polybenzoxazines.
The poly(E−lyme) showed highest thermal stability in these
obtained biothermosets, Td10% of 373 °C
and char yield of 47%, respectively. Furthermore, these polybenzoxazines
showed good application in the CO2 adsorption field as
the carbon precursor, and the activated carbon materials from poly(E−lyme)
had a high surface area of up to 1194 m2 g–1. The remarkably high CO2 adsorption capacity of 5.82
mmol/g was observed on the carbon material ELF0 at 800 mm Hg and 273
K.