Lee, Jung-Hun Jang, Dawon Yang, Inchan Jo, Seong Mu Lee, Sungho 2024-01-19T11:34:26Z 2024-01-19T11:34:26Z 2022-05-12 2022-07 0021-8995 https://pubs.kist.re.kr/handle/201004/114932 Polypropylene (PP) is a synthetic polymer with excellent physical properties useful for various industries. However, its flammability in air limits its applications. In the present work, lignin filler was modified by phosphorylation, and characterized through chemical, structural, thermal, and morphological analyses. The resultant products were incorporated into PP to increase the flame retardancy of PP-based composites. Although, the mechanical properties of the PP composites containing 30 wt% filler deteriorated, the tensile strength was maintained. An addition of phosphorylated lignin (pL) into PP decreased the heat release rate from 1136.5 to 777.2 kW/m(2) and the total smoke release from 25.1 to 9.6 m(2)/m(2). Furthermore, scanning electron microscopy images of the pL incorporated composites after the combustion test revealed that the solid char formed on the composites acted as a protective layer for PP. Thus, incorporating pL into PP is a feasible approach for improving its flame retardancy. English John Wiley & Sons Inc. Effect of phosphorylated lignin on flame retardancy of polypropylene-based composites Article 10.1002/app.52519 1 Journal of Applied Polymer Science, v.139, no.28 Journal of Applied Polymer Science 139 28 N scie scopus 000790232100001 Polymer Science Polymer Science Article THERMAL-STABILITY FLAMMABILITY PROPERTIES SMOKE SUPPRESSION DEGRADATION GRAPHENE BEHAVIOR STARCH composite flame retardancy lignin phosphorylation polypropylene