Journal
CELLULOSE
Volume 20, Issue 1, Pages 149-157Publisher
SPRINGER
DOI: 10.1007/s10570-012-9829-7
Keywords
Cellulose nanofibers; Suspension concentration; Rheology; Ultrasonication
Funding
- Fundamental Research Funds for the Central Universities [DL12DB01]
- Program for New Century Excellent Talents in University [NCET-10-0313]
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Chemical pretreatment combined with high-intensity ultrasonication was performed to disintegrate cellulose nanofibers from poplar wood powders. The cellulose content in each suspension was treated as the control variable because the suspension concentration significantly influences the properties of the resultant cellulose nanofibers via ultrasonic processing. The as-obtained cellulose nanofibers were characterized by fiber diameter distribution, crystal structure, and rheological analysis. An increase of not more than 1.2 % of the cellulose content resulted in finer nanofibers. Both storage modulus and loss modulus of cellulose nanofiber suspensions rapidly increased with increasing concentration because of the gradual formation of a stronger network structure. In addition, the dynamic mechanical behavior of suspensions with fiber contents lower than 0.8 % was affected by the frequency and temperature alteration in contrast with the suspension with higher fiber contents. The sol-gel transformation and the visco-elastic transition depend on the hydroxyl bonding and the cross-linking extent of cellulose nanofibers in various concentration environments.
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