Cellulose micro fiber reinforced natural rubber composites were prepared and the diffusion and transport of aromatic solvents through these composites were studied in the temperature range 30-70 degrees C. The diffusion parameters were investigated with special reference to the effect of fiber loading, penetrant size, temperature and interphase adhesion. The effect of chemical treatments on solvent uptake was also analyzed. The transport coefficients such as diffusion, permeation and sorption coefficients were determined to evaluate the influence of interphase adhesion on transport properties. The van't Hoff relationship was used to determine the thermodynamic parameters. The first order kinetic rate constant was evaluated. Finally, experimental results of the sorption properties of the composites were compared with theoretical predictions. (C) Koninklijke Brill NV, Leiden, 2012