Abstract
The interaction of hydrolysis lignin with dimethyl sulfoxide and a dimethyl sulfoxide-water binary mixture with different component ratios was studied. The stepwise mechanism of solvent penetration into the lignin structure was proposed. The first stage of binding of a solvent mixture with the lignin structures involves adsorption of solvent molecules in polymer pores, and at the second stage complex formation occurs through hydrogen bonds with the functional groups of lignin. It was established that fragmentation of hydrolysis lignin leads to the formation of reactive low-molecular-weight pseudo-monomers.
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