Abstract
The structural characteristics of the lignin from potassium hydroxide (KOH) liquor of jute stick (Corchorus capsularis) pulping were determined and compared with the isolated dioxane lignin from jute stick. The lignin structure was characterized by elemental, methoxyl group analysis, UV, FTIR, 1H-NMR, 31P-NMR, and 2D-NMR spectroscopy and molecular weight. 2D-NMR of both lignins isolated showed a predominance of β-O-4 aryl ether linkages. KOH pulping cleaved β-O-4 aryl ether linkage and increased phenolic hydroxyl group and reduced molecular weight. KOH lignin can replace 40% phenol in phenol-formaldehyde resin with satisfactory shear strength.
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