Preparation of high molecular weight thermoplastic bio-based phenolic resin and fiber based on lignin liquefaction

Abstract In order to improve the application range of lignin phenolic resin, thermoplastic resin was prepared by controlling molar ratio (formaldehyde: phenol) with liquefied lignin, phenol and formaldehyde as raw materials, fiber obtained melt spinning. The effects different curing bath acid proportion (40%, 50%, 60%) on mechanical property, thermal property morphology were investigated, behavior studied. structure properties characterized FT-IR, NMR, GPC, TG, DSC, XRD, SEM strength testing. results showed that when 0.7:1, had best performance, O/P value 1.75, Mw 8298, PDI 2.92. After curing, continued cross-linking reaction, diameter cured thicker than original fiber. most suitable process for hydrochloric into according mass 1:1, heating rate 20 ? h ?1 , termination temperature 170 ?. tensile fibers reached 176.64 MPa elongation at break 1.48%, finally carbon yield 800 37.2%.