N.N. Semenov Federal Research Center for Chemical Physics RAS, Moscow, Russia.
Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.
Sci Rep. 2021 Apr 22;11(1):8765. doi: 10.1038/s41598-021-88040-x.
The cold alkaline treatment or mercerization of cellulose is widely used in industry to enrich the cellulose raw with high-molecular-weight [Formula: see text]-cellulose. Washing out of hemicelluloses by alkalies is accompanied by the rearrangement of the cellulose chains' packing, well known as a transition between cellulose I and cellulose II. Cellulose II can also be produced by the precipitation of the cellulose solutions (regeneration). The currently accepted theory implies that in cellulose II, both mercerized and regenerated, the macromolecules are arranged antiparallelly. However, forming such a structure in the course of the mercerization seems to be significantly hindered, while it seems to be quite possible in the regeneration process. In this work, we discuss the sticking points in the theory on the antiparallel structure of mercerized cellulose from a theoretical point of view summarizing all of the available experimental data in the field.
纤维素的冷碱处理或丝光化在工业中被广泛用于丰富纤维素原料中的高分子量[公式：见正文]-纤维素。碱洗出半纤维素伴随着纤维素链堆积的重新排列，这是纤维素 I 和纤维素 II 之间的转变。纤维素 II 也可以通过纤维素溶液的沉淀（再生）来生产。目前公认的理论表明，在丝光化和再生的纤维素 II 中，大分子都是反平行排列的。然而，在丝光化过程中形成这样的结构似乎受到了很大的阻碍，而在再生过程中似乎是完全可能的。在这项工作中，我们从理论上讨论了丝光化纤维素反平行结构理论中的关键点，总结了该领域所有可用的实验数据。
