Most cellulose-based materials’ manufacturing processes include processing this biopolymer in an aqueous medium. Sorption properties depend on cellulose supramolecular structure and nature of its change during moistening. Plenty of researchers’ efforts have been directed to the development of scientifically sound and commercially reliable processes over the past decade for the cellulose fibers’ dispersion in an aqueous medium. Therefore, it needs a more detailed study of the cellulose–water system components’ interaction. This study presents the supramolecular structure and sorption properties of native cotton cellulose research results obtained by ¹H NMR relaxation, spectroscopy and sorption measurements. Hydrophilic properties of cellulose as an adsorbent are characterized, taking into account a porous system between its structural elements. We examine in detail water adsorption on the active surface of cellulose Iβ. We also demonstrate the approach for determining the entropy change in the first two layers of adsorbed water and estimate this value increased during adsorption. Cellulose moistening is accompanied by the decomposition of macrofibrils into microfibrils and is manifested in a crystallinity decrease and a specific surface area growth.

中文翻译：

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通过质子核磁共振和吸附测量分析纤维素-水系统的状态

大多数纤维素基材料的制造过程都包括在水性介质中加工这种生物聚合物。吸附性能取决于纤维素超分子结构及其在润湿过程中变化的性质。在过去的十年中，大量的研究人员致力于开发科学合理且商业上可靠的方法，以使纤维素纤维分散在水性介质中。因此，它需要对纤维素-水系统组分之间的相互作用进行更详细的研究。这项研究提出了天然棉纤维素的超分子结构和吸附性能的研究结果，由¹1 H NMR弛豫，光谱学和吸收测量。考虑到其结构元件之间的多孔系统，表征了作为吸附剂的纤维素的亲水性质。我们详细研究了纤维素Iβ活性表面上的水吸附。我们还演示了确定前两层吸附水中熵变化的方法，并估计该值在吸附过程中增加。纤维素的润湿伴随着大纤维分解为微纤维，并表现为结晶度降低和比表面积增加。