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Green Epoxy Resin System Based on Lignin and Tung Oil and Its Application in Epoxy Asphalt

Xin, Junna, Li, Mei, Li, Ran, Wolcott, Michael P., Zhang, Jinwen
ACS sustainable chemistry 2016 v.4 no.5 pp. 2754-2761
Fourier transform infrared spectroscopy, bitumen, cycloaddition reactions, epichlorohydrins, epoxides, esters, lignin, linolenic acid, maleic anhydrides, nuclear magnetic resonance spectroscopy, phosphorus, resins, rheological properties, rheometers, stable isotopes, temperature, thermal properties, thermogravimetry, tung oil
In this work, lignin-based epoxy was synthesized by reacting epichlorohydrin (ECH) and partially depolymerized lignin (PDL) and then used for modification of asphalt. The Diels–Alder adduct of methyl esters of eleostearic acid and maleic anhydride (ME-MA) was synthesized and used as a biobased curing agent. The structure of PDL-epoxy was characterized by FTIR and ³¹P NMR. Nonisothermal curing kinetics and thermal properties of the cured epoxy resins were studied by differential scanning analysis, dynamic mechanical analysis, and thermogravimetric analysis, respectively. Curing behaviors of PDL-epoxy and a commercial epoxy DER332 were compared. Effects of epoxy content on rheological properties of the modified asphalt binder were studied using a parallel plate rheometer. Results show that the elastic behavior of asphalt binder at elevated temperatures was improved with increase in epoxy content.