The paper is focused on a deep analysis of transport properties of natural hemp fibers (HF) functionalized through a mechano-chemical treatment assisted by high energy ball milling. The effect of milling time on fibers’ morphology was investigated by means of the scanning electron microscopy and FTIR spectroscopy. The results show that the mechanical effect induced a reduction of the mean diameter of hemp fibers and, simultaneously, the achievement of a close packing of cellulose chains. The barrier properties appeared to be dependent either on the packing of cellulose or the water cluster formation. Fick’s law solution in cylindrical coordinates was used to simulate experimental sorption kinetics and to extrapolate the diffusion parameters. The change of diffusion with equilibrium moisture content was described through an empirical relationship. Sorption isotherms were explained on the basis of Park model which accounts for a dual mode sorption at low activities as well as the water clustering phenomenon occurring at high activities. The mean cluster size (MCS) of water molecules was estimated through the application of Zimm Lundberg theory. Finally, the spreading pressure calculation allowed to estimate the driving force of diffusion inside the systems.

本文着重于对通过高能球磨机进行机械化学处理而功能化的天然大麻纤维（HF）的传输特性进行深入分析。通过扫描电子显微镜和FTIR光谱研究了研磨时间对纤维形态的影响。结果表明，机械作用引起了麻纤维平均直径的减小，并且同时实现了纤维素链的紧密堆积。阻隔性能似乎取决于纤维素的堆积或水簇的形成。使用圆柱坐标系中的菲克定律解来模拟实验的吸附动力学并推断扩散参数。通过经验关系描述了扩散随平衡水分含量的变化。根据Park模型解释了吸附等温线，该模型解释了低活动时的双模式吸附以及高活动时发生的水团聚现象。水分子的平均簇大小（MCS）通过应用Zimm Lundberg理论估算。最后，扩散压力计算可以估算系统内部扩散的驱动力。