Lignin as Green Filler in Polymer Composites: Development Methods, Characteristics, and Potential Applications
Figure 1
(a) The lignin structure and three main lignin precursors [20] (Copyright @ 2017 Science and Education Publishing CC under 4.0) and (b) typical interunit linkages present in softwood lignin [6] (Copyright @ 2018 Springer CC under 4.0).
