Regulation mechanism of graphene oxide on the structure and mechanical properties of bio-based gel-spun lignin/poly (vinyl alcohol) fibers

Lignin has been used as a sustainable and eco-friendly filler in composite fibers. However, lignin aggregation occurred at high content, which significantly hindered the further enhancement of fiber performance. The incorporation graphene oxide (GO) enhanced mechanical properties lignin/poly(vinyl alcohol) (PVA) fibers affected their structure. With GO content increasing from 0 to 0.2%, tensile strength 5% lignin/PVA increased 491 631 MPa, Young's modulus 5.91 6.61 GPa. reinforced 30% also showed same trend. 455 553 5.39 7 best performance was observed PVA containing 0.2% GO, had an average MPa Young’s toughness values these were between 9.9 15.6 J/g, fibrillar ductile fracture microstructure observed. Structure analysis that higher percent crystallinity, evidence hydrogen bonding among lignin, gel revealed. Further, water resistance swelling behavior studied structure change