Key Lab of Science & Technology of Eco-Textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People's Republic of China; Innovation Center for Textile Science and Technology of DHU, Donghua University, Shanghai 201620, People's Republic of China.
Key Lab of Science & Technology of Eco-Textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People's Republic of China; Innovation Center for Textile Science and Technology of DHU, Donghua University, Shanghai 201620, People's Republic of China.
Carbohydr Polym. 2022 Feb 1;277:118878. doi: 10.1016/j.carbpol.2021.118878. Epub 2021 Nov 10.
We have demonstrated, for the first time, high-efficient non-destructive and non-derivative dissolution of cellulose could be achieved in cryogenic aqueous phosphoric acid. Cellulose from different sources and of varying degree of polymerization from 200 (MCC) to 2200 (cotton fabric) could be dissolved completely to afford solutions containing 5 wt%-18 wt% cellulose, from which ultra-strong and tough cellulose films of tensile strength as high as 707 MPa could be obtained using water as the coagulant. These solutions can be stored at -18 °C for extended time without noticeable degradation while desired degree of polymerization is also attainable by tuning the storage conditions. The findings of this work call for renewal attention on phosphoric acid as a promising cellulose solvent for being non-toxic, non-volatile, easy to handle, and cost-effective.
我们首次证明，在低温磷酸水溶液中可以实现高效、无损和无衍生的纤维素溶解。不同来源和聚合度从 200（MCC）到 2200（棉织物）的纤维素都可以完全溶解，得到含有 5wt%-18wt%纤维素的溶液，从中可以获得拉伸强度高达 707MPa 的超高强韧纤维素薄膜，水作为沉淀剂。这些溶液可以在-18°C下储存很长时间而不会明显降解，同时通过调整储存条件也可以获得所需的聚合度。这项工作的发现呼吁重新关注磷酸作为一种有前途的纤维素溶剂，因为它无毒、不易挥发、易于处理且具有成本效益。
