The biocomposites composed of sorbitol polyglycidyl ether (SPE), tung oil-pyrogallol resin (TPG), and wood flour (WF) were prepared by the compression molding at 190 degrees C, and their thermal and mechanical properties were investigated in detail. The epoxy/hydroxy ratio was fixed to 1/1 in the curing reaction of SPE and TPG, based on the fact that the degree of addition of pyrogallol to each tung oil molecule for the TPG used as a flexible bio-based hardener is evaluated to be 2.3 by 1H-NMR method. The SPE-TPG/WF biocomposites showed much higher storage moduli than SPE-TPG did, although tan peak temperatures of the biocomposites (44.545.6 degrees C) were a little lower than that of SPE-TPG (53.5 degrees C). Tensile moduli of the biocomposites increased with an increase of WF content in the range of 050 wt %. Furthermore, the biocomposites had a little higher tensile strength than the cured neat resin did. Field emission-scanning electron microscopy analysis of the biocomposites revealed that WF is tightly incorporated into the crosslinked epoxy resins. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013