Figure 5From: Natural weathering studies of oil palm trunk lumber (OPTL) green polymer composites enhanced with oil palm shell (OPS) nanoparticles SEM micrographs of OPTL at different weathering conditions. (a) dried OPTL before weathering, (b) dried OPTL after 6 months weathering, (c) dried OPTL after 12 months weathering, (d) PF-impregnated OPTL before weathering, (e) PF-impregnated OPTL after 6 months weathering, and (f) PF-impregnated OPTL after 12 months weathering (500× magnification).Back to article page