PRODUCTION OF NANO- CELLULOSE FROM NATIVE CELLULOSE - VARIOUS OPTIONS UTILIZING ULTRASOUND
In this study three different ways of applying ultrasound for the production of nanocellulose from native cellulose has been explored. In the first option bleached hardwood kraft pulp was oxidized with the ultrasound catalyzed TEMPO/NaBr/NaOCl-system (USTEMPO-system) at optimized reaction conditions followed by nanocellulose production by mechanical treatment. The pulp oxidized by US-TEMPO-system at optimum condition has 10％~15％ more carboxyls and ~10％ increase in the nanocellulose yield when compared to the TEMPO-system without sono catalysis. In the second option ultrasound pretreated pulp was subjected to oxidation with TEMPO-system and the oxidized pulp was evaluated for the carboxyls content. No gain in the carboxyls content was obtained in this option compared to the oxidation with TEMPO-system alone even though, scanning electron microscopic analysis showed a higher degree of fibrillation after ultrasound treatment In the third option US-TEMPO and TEMPO oxidized pulps were subjected to mechanical and ultrasound treatment for the production of nanocellulose. At the same span of time nanocellulose yield was higher in the case of ultrasound treatment compared to mechanical one however, at the same nanocellulose concentration Rheometer Stresstech viscosity of nanocellulose solution was inferior in the former. Observation of the nanofibres under transmission electron microscope showed slightly thinner nanofibrils (diameter - 2-6 run) in the case of ultrasound treatment compared to mechanical method (diameter - 3-7 nm).
nanocellulose ultrasound TEMPO native cellulose oxidation carboxyl groups
Shree P. Mishra Anne-S. Manent Bruno Chabot Claude Daneault
Centre de Recherche en P(a)tes et Papiers (CRPP), 3351, boulevard des Forges, Trois-Rivi(e)res (Qu(e)bec) Canada G9A 5H7
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
451-456
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）