Influence of Sonomechanical Treatment on the Structure of Cellulose Micro/Nano Fibrils

Abstract:

The fast-growing Eucalyptus (E. Europhylla) was used as the raw materials to prepare for micro/nanocellulose fibrils. The morphology changes of cellulose by sodium hydroxide linkage ultrasonic energy treatment was discussed. The properties of treated cellulose was evaluated by X-ray , scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy. By the degree of crystallinity of the experimental test results showed that: a high concentration (17.5%, mass fraction) NaOH solution swelling with ultrosonication chemical pretreatment of cellulose prepared micro/nanofibrils change in crystal form, that is transformed cellulose I into cellulose II. However, the cellulose micro/nanofibrils remained crystalline cellulose I type after treated by a low concentration (2%, mass fraction) NaOH solution swelling with ultrosonicaion chemical pretreatment. High alkali activation sound chemical pretreatment increased the crystallinity of obtained micro/nanofibrils, the corresponding values were 89.2% and 86.3%. Observed by the scanning electron microscope that: a low concentration alkaline with ultrosonication chemical pretreatment increased the degree of sub-wire broom, the fiber surface area increased accordingly, and the fiber is more "open", so that the reaction activity of the cellulose fibers improved. The infrared spectrum showed that: the chemical changes between cellulose micro/nanofibrils and NaOH occurred after mercerization.

• Periodical: Key Engineering Materials (Volumes 609-610)
• Pages: 526-530
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.609-610.526
• Online since: April 2014
• Authors: Yan Wu*, Zhi Hui Wu, Xu Jun Zhang, Ji Lei Zhang, Xiao Xing Yan
• Keywords: Affecting, Cellulose, Micro/Nano Fibrils, Sound Chemical Processing, Structure

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