Accelerated Polymerization of Ammonium Lignosulfonate from Loblolly Pine

Lignin bioproducts derived from pulping of woody biomass find utility in multiple industrial applications. Ammonium lignosulfonates have historically displayed unique polymerization characteristics relative to other lignin materials and show promise as sustainable adhesives for the panel industry. To further understand the system's chemistry, polymerization reactions were observed through the lens of viscosity build-up using high temperature rheological measurements. It was found that highly controllable lignosulfonate properties like cooking temperature, pH, and percentage dissolved solids each significantly contribute to gelation behavior. The concept of thermal priming to shorten gelation time was also introduced and demonstrated. Finally, possible applications for this technology are postulated.