June 20, 2016
Syringyl/Guaiacyl (S/G) Ratio In Lignin May Influence Quality Of Carbon Fiber Produced From Lignins
Current lignin-based carbon fiber using low-cost lignin precursors does not possess the mechanical properties required for many structural applications. Lignins with various syringyl/guaiacyl (S/G) ratios were isolated from Populus genotypes and subjected to rheological treatment at various temperatures and cooling conditions. Organosolv lignins extracted from genotypes with lower S/G ratios exhibited higher viscosity values and molecular weights with larger amounts of condensed structures following rheology treatment at relatively lower temperature; higher viscosity and molecular weight is known to provide for higher quality carbon fiber.