Depolymerization of Lignin using Water and Ethanol Solvents to Synthesize Lignin Resole for Preparing Lignin Foam
Keywords:
Bio-foam, Depolymerization, Phenol foamAbstract
In this study, lignin was used as substitution phenol for synthesis lignin foam. The depolymerizations of lignin by water (LS-W) and ethanol solutions (LS-ETH) were used as components for preparing lignin resole (LR) and forming lignin foam (LF). The LS-W and LS-ETH depolymerized lignin solutions with different lignin contents were determined concentration of phenol with reaction times of 30 and 60 min. The solution with the highest concentration of phenol was applied for LR synthesis and LF preparation. From results, the highest phenol concentration of 1644 ppm was obtained in the LS-ETH with 30.61%wt of lignin at the reaction time of 30 min. Each depolymerized lignin solutions with lignin was used as 15 wt% substitute of phenol to synthesize LR for LF preparation. The FTIR analysis of LR and LF showed the same functional group and chemical structure as the phenol foam (PF). The density and compressive strength were 85.68 kg/m3 and 152.27 kPa for the LF from LS-W, and were 70.19 kg/m3 and 113.71 kPa for the LF from LS-ETH, respectively. The SEM morphology revealed that the foams had a closed-cell structure.
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