Fractionation and DOSY NMR as Analytical Tools: From Model Polymers to a Technical Lignin.

ABSTRACT: One key challenge hindering the valorization of lignin is its structural complexity. Artificial lignin-like materials provide a stepping stone between the simplicity of model compounds and the complexity of lignin. Here, we report an optimized synthesis of an all-G β-O-4 polymer 1 designed to model softwood lignin. After acetylation, the polymer Ac-1(V) was fractionated using a protocol that involved only volatile organic solvents, which left no insoluble residue. Using diffusion ordered spectroscopy NMR in combination with gel permeation chromatography, it was revealed that this fractionated material behaved like a flexible linear polymer in solution (average α > 0.5). Acetylated kraft lignin was subsequently processed using the same fractionation protocol. By comparison wit

SUBMITTER: Montgomery JRD 

PROVIDER: S-EPMC6645228 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature