FSCN, Surface and Colloid Engineering, Mid Sweden University, SE-851 70 Sundsvall, Sweden; Nouryon Pulp and Performance Chemicals AB, Box 13000, 850 13 Sundsvall, Sweden.
RISE: RISE Bioeconomy, Drottning Kristinas väg 61, SE-114 86 Stockholm, Sweden.
Carbohydr Polym. 2020 May 15;236:116068. doi: 10.1016/j.carbpol.2020.116068. Epub 2020 Feb 24.
In this study, the effect of different alcohols and esters as a coagulation medium in the regeneration of cellulose dissolved in an aqueous LiOH-urea-based solvent was thoroughly investigated using various methods such as solid state NMR, X-ray diffraction, water contact angle, oxygen gas permeability, mechanical testing, and scanning electron microscopy. It was observed that several material properties of the regenerated cellulose films follow trends that correlate to the degree of cellulose II crystallinity, which is determined to be set by the miscibility of the coagulant medium (nonsolvent) and the aqueous alkali cellulose solvent rather than the nonsolvents' polarity. This article provides an insight, thus creating a possibility to carefully tune and control the cellulose material properties when tailor-made for different applications.
在这项研究中，使用各种方法，如固态 NMR、X 射线衍射、水接触角、氧气透过率、机械测试和扫描电子显微镜，深入研究了不同醇和酯作为纤维素在含水性 LiOH-尿素溶剂中溶解的再生中的凝结介质的效果。结果表明，再生纤维素薄膜的几种材料性能的变化趋势与纤维素 II 结晶度的程度相关，而纤维素 II 结晶度的程度取决于凝结介质（非溶剂）和纤维素碱水溶液的混溶性，而不是非溶剂的极性。本文提供了一个深入的见解，从而为根据不同的应用需求，对纤维素材料性能进行精心调整和控制创造了可能性。
