Conditional repair by locally switching the thermal healing capability of dynamic covalent polymers with light.
Conditional repair by locally switching the thermal healing capability of dynamic covalent polymers with light.
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DOI：
10.1038/ncomms13623
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发表时间：
2016-12-12
影响因子：
16.6
通讯作者：
Hecht, Stefan
中科院分区：
文献类型：
--
作者：
Fuhrmann, Anne;Goestl, Robert;Wendt, Robert;Koetteritzsch, Julia;Hager, Martin D.;Schubert, Ulrich S.;Brademann-Jock, Kerstin;Thuenemann, Andreas F.;Noechel, Ulrich;Behl, Marc;Hecht, Stefan
可治愈材料可以通过延长消费品和建筑的生命周期，在减少现代科技社会的环境足迹方面发挥重要作用。然而，由于大多数修复过程都是单独通过热来进行的，因此修复损伤的能力通常会破坏母材的热性能和机械性能。在这里，我们提出了一种动态共价聚合物网络，其热修复能力可以根据需要通过光“打开”和“关闭”，从而提供局部修复控制，同时保留静态聚合物网络的有利宏观特性。我们采用了一种可光切换的呋喃基交联剂，它与短而可移动的马来酰亚胺取代的聚甲基丙烯酸月桂酯链反应形成强共价键，同时允许可逆的、时空分辨率的热诱导脱交联和重交联控制。我们认为我们的系统可以适应更复杂的材料，并有可能影响响应涂层，光刻和微加工的应用。可修复材料通常是通过加热修复的，而加热会影响材料的性质。在这里，作者报告了一种动态共价聚合物网络，其中光可以打开或关闭愈合能力，允许在不影响聚合物整体的情况下在指定位置愈合。
Healable materials could play an important role in reducing the environmental footprint of our modern technological society through extending the life cycles of consumer products and constructions. However, as most healing processes are carried out by heat alone, the ability to heal damage generally kills the parent material's thermal and mechanical properties. Here we present a dynamic covalent polymer network whose thermal healing ability can be switched ‘on' and ‘off' on demand by light, thereby providing local control over repair while retaining the advantageous macroscopic properties of static polymer networks. We employ a photoswitchable furan-based crosslinker, which reacts with short and mobile maleimide-substituted poly(lauryl methacrylate) chains forming strong covalent bonds while simultaneously allowing the reversible, spatiotemporally resolved control over thermally induced de- and re-crosslinking. We reason that our system can be adapted to more complex materials and has the potential to impact applications in responsive coatings, photolithography and microfabrication. Healable materials are typically repaired by heat, which can affect the properties of the substance. Here the authors report a dynamic covalent polymer network in which light can switch the healing abilities on or off, allowing healing at defined locations without affecting the polymer as a whole.
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