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1. (WO2018203835) A METHOD OF ACTIVATING AND/OR REVERSIBLY DISSOLVING CELLULOSE

Pub. No.:    WO/2018/203835    International Application No.:    PCT/SG2018/050221
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Sat May 05 01:59:59 CEST 2018
IPC: C08B 1/00
C08B 16/00
C08B 5/00
C08L 1/16
D01F 2/02
Applicants: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
Inventors: LUO, He-Kuan
LEE, Agnes Mei Xian
Title: A METHOD OF ACTIVATING AND/OR REVERSIBLY DISSOLVING CELLULOSE
Abstract:
According to the present disclosure, a method of reversibly dissolving cellulose in an organic solvent is provided. The method includes mixing a solution comprising dimethyl sulfoxide and cellulose with an organic base in the presence of carbon dioxide, wherein the organic base is a guanidine represented by a formula of: wherein each of R1, R2 and R3 is C1-C20 alkyl; wherein each of R4 and R5 is hydrogen or C1-C20 alkyl; and maintaining the presence of carbon dioxide to form a transparent solution comprising dissolved cellulose in the form of cellulose carbonate anions.