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A lignin-functionalised epoxy-based matrix using protic ionic liquid as an extraction medium: Preparation and thermomechanical characterisation

Ms Shammi Sultana Nisha, PhD Student, Swinburne University of Technology


A bio-composite of ionic liquid lignin (ILL)–epoxy was prepared from lignin microparticles and a fast curing thermoset epoxy resin (FCTER). A low cost protic ionic liquid (Triethylammonium Hydrogen Sulfate) was used as a new carrier for introducing lignin into the matrix.  The aim of this work is to study the thermal and mechanical effect of ILL as an additive for a fast curing DGEBA pre-polymer, a bisphenol A – based epoxy hardened with an anhydride based curing agent. Surface properties and surface composition of the designed IL-epoxy resin were investigated by the contact angle and X-ray photoelectron spectroscopy (XPS). The degradation mechanisms and the influence of the ionic liquid lignin on the thermal stability of ILL- epoxy networks has been evaluated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Addition of ILL led to a significant improvement of the thermal behavior of the epoxy networks, by increasing the glass transition temperature from ~40°C to 50°C. The mechanical testing showed that the flexural toughness of the matrix was increased by 23.50%.


Shammi is a PhD student in Material Engineering and possess a passion for working on nanomaterial science. She is dedicated and quick at up taking up new skills, is an effective communicator and enjoys handling new challenges and has successfully completed the first year of candidature of his PhD course.