Sep 08, 2020 · According to the results, the anionic charge density reached its maximum value at the ratio of 0.2 mol/mol as 1,4– butanesultone is known to be an effective reagent to react with both phenolic and aliphatic groups [21,37,38]. Therefore, the molar ratio of 0.2 mol/mol was selected for the sulfobutylation reaction to produce sulfobutylated lignin.
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