Plasma Treatment Induced Chemical Changes of Alkali Lignin to Enhance the Performances of Lignin-Phenol-Formaldehyde Resin Adhesive

Alkali lignin was processed by plasma and then used in modification of phenol formaldehyde resin this study. Chemical structural changes which as well bonding strength, tensile property, curing performance thermal property the prepared modified were analyzed. Results demonstrated that: (1) degraded after processing. The original groups destroyed, aromatic rings collected abundant free radicals oxygen-containing functional like hydroxyls, carbonyls, carboxyls acyls introduced into increase reaction activity significantly. (2) introduction alkali decreased content increased strength toughness resin, especially treated with plasma. (3) led to high temperature for but that reduced lignin. (4) could also stability better than unprocessed Based on results, modify