Thermal and FTIR study of polyvinylpyrrolidone/lignin blends

Sugar cane bagasse lignin (SCBL) was extracted with formic acid (FA) from a sugar and alcohol factory residue, and used for blends preparation with polyvinylpyrrolidone (PVP). Casting from DMSO and FA solutions were used as preparation procedure. PVP and PVP/SCBL blends were also irradiated with ultraviolet light (Hg lamp). Blend formation and irradiation effects were examined through thermogravimetric analysis (TG) and infrared spectroscopy (FTIR). Results suggest a greater interaction between PVP and SCBL chains in PVP/SCBL 95/5 cast from DMSO and in the 95/5 and 90/10 blends cast from FA. Pure PVP shows a thermal stability decrease due to irradiation and this effect is minimized in the PVP/SCBL blends. The initial stage of the thermal decomposition of PVP is anticipated by the SCBL incorporation.