where L is the thickness of the specimen and D is the diffusion coefficient. The data were plotted as Mt/M∞ against t1/2, and the diffusion coefficients were estimated from the slopes of the linear part of the plots. As listed in Table 2, the diffusion coefficients were found to increase with the mAC content and the increased cell density, implying that a larger amount of water molecules could diffuse at higher mAC content. This is in agreement with the foamed polyethylene/rice husk composites
[6] and the polypropylene/wood flour/nanoclay hybrid composites [12].