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An Energy‐Efficient One‐Pot Swelling/Esterification Method to Prepare Cellulose Nanofibers with Uniform Diameter
Author(s) -
Song Yang,
Chen Wei,
Niu Xun,
Fang Guigan,
Min Huihua,
Pan Hui
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801794
Subject(s) - cellulose , swelling , nanofiber , solvent , pulp (tooth) , hydrogen bond , materials science , swelling capacity , chemical engineering , polymer chemistry , catalysis , maleic anhydride , organic chemistry , chemistry , molecule , polymer , composite material , copolymer , medicine , pathology , engineering
An energy‐efficient method has been developed to prepare 3–5 nm‐wide carboxyl‐functionalized cellulose nanofibers (CNFs) from pulp fiber by a simple one‐pot swelling followed by esterification process. Tetrabutylammonium acetate (TBAA)/dimethyl sulfoxide (DMSO) binary solvent is used as the swelling agent and the esterification medium admixed with maleic anhydride. All steps are performed at room temperature and no post‐mechanical treatment is needed. The highly efficient defibrillation of pulp fiber to CNFs is thought to be due to two factors: 1) swelling in TBAA/DMSO effectively loosens the structure of cellulose supermolecules by breaking the intra‐ and intermolecular hydrogen bonds between cellulose chains; and 2) the carboxyl groups grafted onto the cellulose molecules by esterification prohibit the reformulation of hydrogen bonds between cellulose chains and therefore stabilize the disperse CNFs with uniform diameter in solution. Other than acid anhydride, no catalyst is added for the esterification, which facilitates the recycling and reuse of the binary solvent. This energy‐efficient one‐pot method could facilitate the large‐scale manufacture of bio‐based nanomaterials.