Comparison of different cyclic organic carbonates in the oxyalkylation of various types of lignin
The synthetic versatility and the low toxicity of cyclic alkyl carbonates has driven a wider interest in their use to access new biobased and environmentally friendly polymer building blocks, especially as alkylating reagents. Here, we report for the first time, the synthesis of biobased polyols from lignins of different sources (hardwood, softwood, annual plants) and pulping processes (organosolv, kraft, soda) by oxyalkylation with ethylene (EC), propylene (PC), butylene (BC) and glycerol carbonate (GC). The synthesis of lignin polyols was performed using optimized conditions regarding catalysts, catalyst-to-biomass ratio, reaction time, temperature and amount of cyclic carbonates. To better understand the oxyalkylation of the various types of lignins using different cyclic organic carbonates, the generated polyols were comprehensively characterized by FTIR,
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