Post-synthesis modification of slide-ring gels for thermal and mechanical reconfiguration
Post-synthesis modification of slide-ring gels for thermal and mechanical reconfiguration
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DOI：
10.1039/d0sm02260h
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发表时间：
2021-04-27
期刊：
影响因子：
3.4
通讯作者：
Bruns, Carson J.
中科院分区：
文献类型：
--
作者：
Dikshit, Karan;Bruns, Carson J.
聚轮烷中的环滑动行为使凝胶、弹性体和玻璃具有显著的应力消散和驱动性能。由于这些性质可以通过结构参数进行调制和调节，因此人们致力于开发定义滑环材料的结构和性能的合成方案。我们介绍了由未改性的α-环糊精和聚乙二醇聚轮烷衍生的滑环凝胶的合成后修饰，这种修饰能够(I)驱动和控制环改性滑环水凝胶的温度响应性低临界溶液温度(LCST)行为，以及(Ii)使用滑环粘结剂溶液将单独的凝胶化学结合到杂化或形状重构的宏观结构中。用剪切流变学和单轴拉伸实验对改性后凝胶的力学性能进行了表征，用广角X射线散射对干凝胶进行了表征。这些演示表明，合成后的改性为重新配置滑环凝胶的性质和形状提供了一种实用的解决方案。
Ring-sliding behavior in polyrotaxanes imbues gels, elastomers, and glasses with remarkable stress-dissipation and actuation properties. Since these properties can be modulated and tuned by structural parameters, many efforts have been devoted to developing synthetic protocols that define the structures and properties of slide-ring materials. We introduce post-synthetic modifications of slide-ring gels derived from unmodified alpha-cyclodextrin and poly(ethylene glycol) polyrotaxanes that enable (i) actuation and control of the thermo-responsive lower critical solution temperature (LCST) behavior of ring-modified slide-ring hydrogels, and (ii) chemically bonding separate gels into hybrid or shape-reconfigured macro-structures with a slide-ring adhesive solution. The mechanical properties of the post-modified gels have been characterized by shear rheology and uniaxial tensile tests, while the corresponding xerogels were characterized by wide-angle X-ray scattering. These demonstrations show that post-synthetic modification offers a practical solution for re-configuring the properties and shapes of slide-ring gels.