作者：X. Lu, C. Y. Chan, K. I. Lee, P. F. Ng, B. Fei, J. H. Xin and J. Fu
关键字：Hydrogel, Shape memory
论文来源：期刊
具体来源：Journal of Materials Chemistry B, 2014, 2, 7631-7638.
发表时间：2014年
Recoverable hydrogels with high stretch and toughness have been synthesized by one-step radical polymerization. They consist of covalently crosslinked polyacrylamide (PAAm) and ionically crosslinked carrageenan. Such double network (DN) hydrogels can be stretched beyond 20 times its initial length, and their fracture energy reached a high value of ~9500 J/m2. By comparing hydrogel tensile properties at different temperatures, the contribution of ionic network to the toughness was quantitatively clarified in percentage for the first time. The stretched hydrogels were completely healed by short treatment at a mild temperature. Through drying at stretch, they were also transformed into stiff absorbent fibers that still preserved their shape memory of wet state.