For cellulose nanocrystal film, water adsorption is extremely important for its product performance. For gaining a deeper understanding of hygroscopic behavior, two cellulose nanocrystal films, such as TEMPO oxidized cellulose nanocrystal film (TOCNF) and sulfuric acid treated cellulose nanocrystal film (SACNF) were investigated using dynamic water vapor sorption apparatus. During the water vapor sorption process, the running time, real-time sample mass, target relative humidity (RH), actual RH and real-time temperature were all collected. Through the comparison of these collected data, significant differences in the equilibrium moisture content, sorption hysteresis and sorption kinetics were confirmed. It was important to note that TOCNF and SACNF had equilibrium moisture contents of 28.2% and 22.8, respectively, at a RH of 95%. Then, using parallel exponential kinetics (PEK) model, sorption kinetics data were accurately fitted. Furthermore, two Kelvin-Voigt elements were introduced to interpret the fitting results and calculate the modulus of TOCNF and SACNF.

对于纤维素纳米晶体薄膜，吸水对其产品性能极为重要。为了更深入地了解吸湿性能，使用动态水蒸气吸附设备研究了两种纤维素纳米晶体薄膜，如TEMPO氧化纤维素纳米晶体薄膜（TOCNF）和硫酸处理的纤维素纳米晶体薄膜（SACNF）。在水蒸气吸附过程中，收集了运行时间，实时样品质量，目标相对湿度（RH），实际RH和实时温度。通过比较这些收集的数据，确认了平衡水分含量，吸附滞后和吸附动力学方面的显着差异。重要的是要注意，在RH为95％的情况下，TOCNF和SACNF的平衡水分含量分别为28.2％和22.8。然后，使用平行指数动力学（PEK）模型，精确拟合了吸附动力学数据。此外，引入了两个Kelvin-Voigt元素来解释拟​​合结果并计算TOCNF和SACNF的模量。