TEMPO-Oxidized Nanocellulose Participating as Crosslinking Aid for Alginate-Based Sponges
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- 作者：Ning Lin ; C茅cile Bruzzese ; Alain Dufresne
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：September 26, 2012
- 年：2012
- 卷：4
- 期：9
- 页码：4948-4959
- 全文大小：897K
- 年卷期：v.4,no.9(September 26, 2012)
- ISSN：1944-8252
文摘
Crosslinked polysaccharide sponges have been prepared by freeze-drying of amorphous alginate鈥搊xidized 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 alginate-based sponge鈥檚 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 semi-interpenetrating 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.