fig1
Figure 1. Structure properties of lignin fractions. (A) FT-IR curves; (B) molecular weight; (C) content of various OH groups detected by 31P NMR; (D) TG curves; (E) DTG curves. FT-IR: Fourier transform infrared spectroscopy; 31P NMR: phosphorus nuclear magnetic resonance; TG: thermogravimetric; DTG: derivative thermogravimetric.
