Molar mass determination of lignins and characterization of their polymeric structures by multi-detector gel permeation chromatography

Abstract Molar masses, Mark-Houwink-Sakurada (MHS) exponents, and refractive index increments (dn/dc) for three lignins were determined without derivatization by multi-detector gel permeation chromatography (GPC) in dimethylformamide (DMF) with 0.05 M lithium bromide (LiBr). The lack of effectiveness fluorescence filters on molar mass determination GPC-multi-angle laser light scattering (MALS) was confirmed softwood kraft lignin (Indulin AT) revealed mixed hardwood organosolv (Alcell) as well soda straw/grass (Protobind 1000). GPC viscometry detection that these present compact molecules. MHS exponent α Indulin AT Alcell the order 0.1. Additionally, intrinsic viscosity Protobind 1000 a given much lower than either or AT. This is first report dn/dc values DMF LiBr.