Grenoble Institute of Technology (Grenoble INP), The International School of Paper, Print Media, and Biomaterials (Pagora), BP65, 38402 Saint Martin d'Hères Cedex, France.
ACS Appl Mater Interfaces. 2012 Sep 26;4(9):4948-59. doi: 10.1021/am301325r. Epub 2012 Sep 17.
Crosslinked polysaccharide sponges have been prepared by freeze-drying of amorphous alginate-oxidized nanocellulose in the presence of a Ca(2+) 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'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 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.
通过在 Ca(2+) 离子交联剂存在下冷冻干燥无定形海藻酸钠-氧化纳米纤维素，制备了交联多糖海绵。纳米纤维素表面的新羧基基团由化学氧化诱导，为参与海藻酸钠海绵结构的构建提供了可能性，并在随后海绵的结构和机械稳定性中发挥了根本作用。此外，氧化纤维素纳米晶体引起的机械强度增强和氧化微原纤化纤维素形成的半互穿聚合物网络也有报道。与简单的离子交联过程相结合，超高的孔隙率、优异的吸水性和保持性以及交联海绵的压缩强度的提高，应该会显著扩展这种软材料在各种实际应用中的使用。
