Regenerated cellulose membranes (RCMs) were p r e p a r e d f r o m c e l l u l o s e s u ffi c i e n t l y d i s s o l v e d i n [TMGH] 2 +[OOCOCH 2 CH 2 OCOO] 2− /DMSO (X ILS = 0.2, X ILs is the mole fraction of reversible ionic liquids in the mixed solvents) mixed solution under mild conditions (50 °C, 3 h, P CO 2 = 0.2 MPa) using different coagulation baths of ethanol, methanol, NaOH, and H 2 SO 4 aqueous solutions. The structure and properties of these membranes were characterized using various characteristic technologies. The membrane regenerated from ethanol exhibited good thermostability and mechanical, water vapor, and oxygen barrier properties with a tensile strength of 56.2 MPa, a tensile strain of 20.4%, an excellent water vapor permeability of 8.7 × 10 −3 g μm/m 2 day kPa, and an oxygen permeability (OP) of 4.087 cm 3 μm/m 2 day atm. The membranes regenerated from aqueous solutions of alkali and acid have an OP that tends to zero. This study provides a novel dissolving strategy to prepare cellulose membranes that have potential applications in the packaging, food, and agricultural industries.
A novel fully biobased cellulose-3-(2-hydroxyphenyl) propionate ester with satisfactory antioxidant activity and UV-resistant properties was first prepared using cellulose and 3,4-dihydrocoumarin (DHC) in a DMSO/DBU/CO2 solvent system without adding any external catalyst.
With the increasing development of biorefinery, the value-added applicaition of lignin has been obtained great attention, while effective derivatization of lignin is believed to be one of important strategies to...
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