State Key Laboratory of Polymer Materials Engineering (Sichuan University) , Polymer Research Institute of Sichuan University , Chengdu 610065 , China.
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization , Chengdu Institute of Biology, Chinese Academy of Sciences , Chengdu 610041 , China.
ACS Appl Mater Interfaces. 2018 May 2;10(17):15021-15029. doi: 10.1021/acsami.8b01410. Epub 2018 Apr 19.
The research of hydrogels has been increasingly focused on designing an effective energy dissipation structure in recent years. Here, we report a kind of novel supramolecular cross-linker, which was formed by self-assembling amphiphilic block copolymers with guest groups at the end and vinyl-functionalized cyclodextrin (CD) through host-guest interaction. These cross-linkers could dissipate energy effectively since they combined multiple sacrificial mechanisms across multiscales through physical interactions. The resulted hydrogel shows distinguishing mechanical properties (fracture toughness of 2.68 ± 0.69 MJ/m, tension strength of up to 475 kPa, uniaxial stretch over 2100%), remarkable fatigue resistance, and thermal- and light-responsive behaviors.
近年来，水凝胶的研究越来越集中于设计有效的能量耗散结构。在这里，我们报告了一种新型的超分子交联剂，它是通过主客体相互作用由带有端基客体基团的两亲嵌段共聚物与乙烯基功能化环糊精自组装形成的。这些交联剂可以有效地耗散能量，因为它们通过物理相互作用在多个尺度上结合了多种牺牲机制。所得水凝胶表现出独特的机械性能（断裂韧性为 2.68 ± 0.69 MJ/m，拉伸强度高达 475 kPa，单轴拉伸超过 2100%）、优异的耐疲劳性以及热响应和光响应行为。
