In this study, phenol formaldehyde (PF) resins were synthesized using both bark extractives and phenol-liquefied barks from mountain pine beetle (Dendroctonus ponderosae Hopkins) infested Iodgepole pine (Pinus contorta Dougl.). The thermal stability and thermal degradation kinetics of the bark-derived PF resins were investigated by thermogravimetric analysis (TGA). The structural changes in the bark-derived PF resins at different stages of the thermal degradation were studied using the Fourier Transform Infrared Spectroscopy (FTIR). Thermal stability of the post-cured bark-derived PF resins were similar to that of the lab PF resin but differed significantly from that of the post-cured commercial PF resin. Bark-derived PF resin made from bark extractives differed significantly in thermal stability and thermal degradation kinetics from the bark-derived PF resin made from the phenol-liquefied bark. The bark-derived PF resin made from the bark extractives showed a higher thermal stability. (C) 2012 Elsevier B.V. All rights reserved.