Preparation and properties of bamboo lignin-based epoxy resin composite system
The bamboo lignin was utilized as raw material to prepare epoxidized lignin(EL).The EL was then uniformly dispersed into the epoxy resin precursor with the cooperative dissolution of polyethylene glycol(PEG)and the EL-modified epoxy resin crosslinking system was thus formed.The curing kinetics of the epoxy resin system containing PEG were investigated using non-isothermal differential scanning calorimetry,and the optimal curing process was determined to be 80 ℃ for 4 hours followed by 120 ℃ for 2 hours.The tensile and flexural performance tests were conducted on the cured samples to assess mechanical properties of the epoxy resin system modified with EL under the synergistic dispersion effect of PEG.The results demonstrated that mechanical performance of epoxy resin was enhanced significantly with the EL addition.When the EL mass fraction was 5％,the tensile and flexual strength increased by 99.5％and 71.6％,respectively,in comparison to the pure epoxy resin system.
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