Lignin as additive in polypropylene/coir composites: Thermal, mechanical and morphological properties

► Lignin as additive tends to coat fibers and protect against thermal degradation. ► Lignin can be used as primary antioxidant in PP/coir composites. ► Studies on the action of natural fiber constituents allow insight into NFRC behavior. ► Studies on possible uses of lignin may be important for the paper industry.