PREPARATION AND CHARACTERIZATION OF NANOCELLULOSE FROM BLEACH WOOD PULPS BY TEMPO/NaClO/NaClO2 OXIDATIONS SYSTEM

Abstract

In this article, we presented the results of the preparation and
characterization of nanocellulose using the TEMPO/NaClO/NaClO2 oxidation
system (TEMPO-ONC). The results indicated that at optimal reaction conditions
of pH = 6.8, reaction temperature 40o
C, NaClO 0.5mmol/g, nanocellulose
TEMPO-ONC reached a carboxyl content of 0.6 mmol/g in 6h, crystallinity slightly
reduced compared to the original cellulose (crystallinity decreased from 70% to
67,4%). Nanocellulose TEMPO-ONC with 30 ÷ 40nm in widths and 50 ÷ 70nm
in lenghts were obtained after 60 minutes ultrasonic treatment.