Double-Network Strategy Improves Fracture Properties of Chondroitin Sulfate Networks

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• 作者：Tiffany C. Suekama ; Jian Hu ; Takayuki Kurokawa ; Jian Ping Gong ; Stevin H. Gehrke
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：February 19, 2013
• 年：2013
• 卷：2
• 期：2
• 页码：137-140
• 全文大小：227K
• 年卷期：v.2,no.2(February 19, 2013)
• ISSN：2161-1653

文摘

A tough and ductile, ultrathin film, double-network (DN), biopolymer-based hydrogel displaying the yielding phenomenon was synthesized from methacrylated chondroitin sulfate (MCS) and polyacrylamide (PAAm). The DN of MCS/PAAm exhibited a failure stress more than 20 times greater than the single network (SN) of either MCS or PAAm and exhibited yielding stresses over 1500 kPa. In addition, the stress鈥搒train behavior with a yielding region was also seen in a hydrogel of MCS and poly(N,N-dimethyl acrylamide) (PDMAAm). By replacing PAAm with PDMAAm, interactions known to toughen networks are removed. This demonstration supports the idea that the brittle/ductile combination is key to the DN effect over specific interactions between the networks. The MCS/PAAm and MCS/PDMAAm DN hydrogels had comparable mechanical properties to the archtypal DN hydrogels of poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS)/PAAm. In addition, these tough and ductile, biopolymer-based, double-network hydrogels demonstrated a substantial yielding region.