4.7 Article

Choline chloride-based deep eutectic solvent systems as a pretreatment for nanofibrillation of ramie fibers

期刊

CELLULOSE
卷 26, 期 5, 页码 3069-3082

出版社

SPRINGER
DOI: 10.1007/s10570-019-02290-7

关键词

Cellulose nanofibrils; Deep eutectic solvent; Ramie fibers; Pretreatment; Ball milling

资金

  1. National Natural Science Foundation of China [21878326]
  2. Earmarked Fund for China Agriculture Research System [CARS-19-08B]
  3. Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences [ASTIP-IBFC07]

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As a new type of green solvents, deep eutectic solvents (DESs) were used as pretreatment media for the nanofibrillation of ramie fibers (RFs). Two DESs, choline chloride-oxalic acid dihydrate (CO) and choline chloride-urea (CU), were formed at 100 degrees C and then applied to decompose RFs. The DES-pretreated fibers were nanofibrillated using a planetary ball mill, and their properties were analyzed. During the DES pretreatment, CU DES could only dissolve some of hemicelluloses in raw RFs, while CO DES could degrade some oligosaccharides and a part of amorphous cellulose to loosen the fiber structure. Therefore, only the CO DES pretreatment could significantly enhance nanofibrillation of the RFs with a low hemicellulose content in this study, as indicated by the decrease of milling time (from 11 to 5h) to obtain desirable cellulose nanofibrils (CNFs). After 7h CO DES pretreatment at room temperature and a subsequent ball milling process, a turbid and gel-like CNF suspension with a mean equivalent spherical diameter of 262nm was obtained from RFs, and the mass yield of CNFs reached 94.06%. The CNFs also showed a crystallinity index of 66.51% and a thermal stability with T-max=322.6 degrees C, and the produced CNF film had a tensile strength of 52MPa. Overall, the CO DES pretreatment has great potential for use in the production of CNFs from RFs. [GRAPHICS] .

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