Glass transition temperature and mechanical damping of spruce lignin plasticized with methylimidazolium-based ionic liquids

Journal article, 2025

An isolated spruce lignin was plasticized with methylimidazolium-based ionic liquids (ILs) with varying cations and anions and the glass transition temperature (Tg) and mechanical damping of the blends were determined with dynamic mechanical analysis (DMA). The Tg was found to decrease for all blends. The mechanical damping, however, was found to be maintained or decreased upon plasticization, indicating a maintained or increased mechanical rigidity. Only a combination that included the sterically hindered, strongly hydrogen-bond-accepting anion acetate increased mechanical damping.