title: Biobased Epoxy Nanocomposites Derived from Lignin-Based Monomers.
abstract: Biobased epoxy nanocomposites were synthesized based on 2-methoxy-4-propylphenol (dihydroeugenol, DHE), a molecule that has been obtained from the lignin component of biomass. To increase the content of hydroxyl groups, DHE was o-demethylated using aqueous HBr to yield propylcatechol (DHEO), which was subsequently glycidylated to epoxy monomer. Optimal conditions in terms of yield and epoxy equivalent weight were found to be 60 °C with equal NaOH/phenolic hydroxyl molar ratio. The structural evolution from DHE to cured epoxy was followed by (1)H NMR and Fourier transform infrared spectroscopy. The nano-montmorillonite modified DHEO epoxy exhibited improved storage modulus and thermal stability as determined from dynamic mechanical analysis and thermogravimetric analysis. This study widens the synthesis routes of biobased epoxy thermosets from lignin-based molecules.
authors.affiliation: †Brown Laboratory and Department of Chemistry and ‡Forney Hall of Chemical Engineering, School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.
authors.forename: Shou
authors.initials: S
authors.lastname: Zhao
authors.affiliation: †Brown Laboratory and Department of Chemistry and ‡Forney Hall of Chemical Engineering, School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.
authors.forename: Mahdi M
authors.initials: MM
authors.lastname: Abu-Omar
mesh_terms: D004853:Epoxy Resins / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D010636:Phenols; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D004853:Epoxy Resins; D010636:Phenols; D008031:Lignin; C099327:4-propylphenol