Suekama Tiffany C, Hu Jian, Kurokawa Takayuki, Gong Jian Ping, Gehrke Stevin H
Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas, 66045, United States.
Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan.
ACS Macro Lett. 2013 Feb 19;2(2):137-140. doi: 10.1021/mz3006318. Epub 2013 Jan 18.
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-strain behavior with a yielding region was also seen in a hydrogel of MCS and poly(,-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.
由甲基丙烯酸化硫酸软骨素（MCS）和聚丙烯酰胺（PAAm）合成了一种坚韧且有韧性的超薄膜双网络（DN）生物聚合物基水凝胶，该水凝胶表现出屈服现象。MCS/PAAm双网络的破坏应力比单独的MCS或PAAm单网络（SN）大20倍以上，屈服应力超过1500 kPa。此外，在MCS与聚（N，N-二甲基丙烯酰胺）（PDMAAm）的水凝胶中也观察到了具有屈服区域的应力-应变行为。用PDMAAm取代PAAm后，已知的强化网络的相互作用被消除。这一证明支持了这样一种观点，即脆性/韧性组合是双网络效应相对于网络间特定相互作用的关键。MCS/PAAm和MCS/PDMAAm双网络水凝胶的力学性能与聚（2-丙烯酰胺基-2-甲基丙烷磺酸）（PAMPS）/PAAm的典型双网络水凝胶相当。此外，这些坚韧且有韧性的生物聚合物基双网络水凝胶表现出显著的屈服区域。
