Journal
CARBOHYDRATE POLYMERS
Volume 181, Issue -, Pages 506-513Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.08.119
Keywords
Cellulose nanofibrils; Cellulose II; NaOH treatment; Thermal stability; French pressure cell press
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The thermal stability of cellulose nanofibrils (CNFs) can be improved by converting cellulose crystalline structure to cellulose II using an alkaline treatment method. The conventional method requires around 20 wt.% NaOH solutions and causes the cellulose interdigitation and aggregation, making CNFs production difficult. The objective of this study is to develop a new pretreatment method using a low-concentration alkaline solution to produce well-dispersed CNFs with improved thermal stability. CNFs with 90 nm diameter were successfully prepared by treating cellulose powder with 2 wt.% NaOH solution below 0 degrees C, followed by homogenization through a French pressure cell press. The CNFs had relatively high thermal stability with the mean onset and maximum thermal decomposition temperature of 305 degrees C and 343 degrees C, respectively, compared with the CNFs prepared without the NaOH pretreatment (283 degrees C and 310 degrees C). The increased thermal stability can create new opportunities for the development of CNF-based bio-composites and electronics.
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