TEMPO-Oxidized Nanocellulose Participating as Crosslinking Aid for Alginate-Based Sponges
writer：Ning Lin, Cécile Bruzzese, Alain Dufresne
keywords：nanocellulose，sponge
source：期刊
specific source：ACS Applied Materials & Interfaces, 2012, 4(9), 4948–4959.
Issue time：2012年
Crosslinked polysaccharide sponges have been prepared by freeze-drying of amorphous alginate oxidized nanocellulose in the presence of a Ca2+ ionic crosslinking agent. The new carboxyl groups on the surface of nanocellulose induced by the chemical oxidization provided the possibility of participating in the construction of an alginatebased sponge’s structure and played a fundamental role in the structural and mechanical stability of ensuing sponges. Furthermore, enhanced mechanical strength induced by oxidized cellulose nanocrystals and the formation of a semiinterpenetrating polymer network from oxidized microfibrillated cellulose were reported. Together with the facile and ionic crosslinking process, the ultrahigh porosity, promising water absorption and retention, as well as the improved compression strength of the crosslinked sponges should significantly extend the use of this soft material in diverse practical applications.