Sun Yuan-Na, Gao Guo-Rong, Du Gao-Lai, Cheng Ya-Jun, Fu Jun
Polymers and Composites Division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China.
ACS Macro Lett. 2014 May 20;3(5):496-500. doi: 10.1021/mz500221j. Epub 2014 May 9.
Vinyl-functionalized thermosensitive Pluronic F127 micelles have been used as multifunctional cross-links for the synthesis of super tough, highly resilient and thermoresponsive nanomicelle (NM) hydrogels. Pluronic F127 diacrylate (F127DA) with vinyl groups on both ends self-assembled in aqueous solution into micelles. Such micelles served as multifunctional macro-cross-links to copolymerize with acrylamide (AAm) monomers, generating novel NM hydrogels with extraordinary tensile and compressive properties, without using any chemical cross-linkers. Uniaxial tensile tests demonstrated a fracture strain above 2265%, an ultimate stress of 276 kPa, and a fracture energy of 2.34 MJ/m. Under compression tests, these hydrogels did not fracture up to 98% strain and 62 MPa stress. Cyclic compressive loading-unloading tests at 90% strain showed no decay of the hyseteresis energy, indicating an unprecedented fatigue resistance.
乙烯基功能化的热敏性普朗尼克F127胶束已被用作多功能交联剂，用于合成超坚韧、高弹性和热响应性的纳米胶束（NM）水凝胶。两端带有乙烯基的普朗尼克F127二丙烯酸酯（F127DA）在水溶液中自组装成胶束。这种胶束作为多功能大分子交联剂与丙烯酰胺（AAm）单体共聚，生成具有非凡拉伸和压缩性能的新型NM水凝胶，且无需使用任何化学交联剂。单轴拉伸试验表明，断裂应变超过2265%，极限应力为276 kPa，断裂能为2.34 MJ/m。在压缩试验中，这些水凝胶在应变达98%和应力达62 MPa时都不会断裂。在90%应变下的循环压缩加载-卸载试验表明滞后能量没有衰减，这表明具有前所未有的抗疲劳性。
