Post by Saman Ghahri

Not every waste stream dreams of becoming glue… But hardwood kraft black liquor had bigger plans. 😄 It started as a dark, stubborn by-product from the pulp industry, the kind of material most people would rather burn than believe in. We sent this lignin to a chemistry gym! first, acetone fractionation to reduce its messy heterogeneity, and then glyoxalation to help it build its own crosslinked network. The funniest part? The acetone-insoluble fraction, the one that might look like the difficult kid in the lignin family, became the star performer. After glyoxalation, AI-HKL formed stronger self-crosslinked structures, showed higher viscosity, improved thermal behavior, and delivered the best plywood bonding strength of 0.8 MPa among the lignin adhesives tested. So yes, black liquor went from “industrial waste” to “I can hold plywood together.” That is what I call a successful career change. 🌱🪵 This work shows that hardwood kraft lignin, often considered less reactive and more challenging than softwood lignin, can be transformed into a promising formaldehyde-free bio-adhesive through the right fractionation and modification strategy. Maybe lignin is not stubborn. Maybe it just needs the right chemistry to open up. 😉 What do you think is the biggest challenge for bringing lignin-based adhesives closer to industrial application? DOI: https://lnkd.in/eHUAbC_y #Lignin #GreenChemistry #SustainableMaterials #BiobasedMaterials #Biomass #MaterialsScience #ResearchLife #LabLife #WoodAdhesives #bioadhesive #wood #woodproducts #biomaterials #ligninstory #CircularEconomy #Wastemanagement #recycle #renewablematerials #woodpulp #blackliquor #environmentalsolution #SSbD