Dual stimuli responsive self-healing and malleable materials based on dynamic thiol-Michael chemistry
Dual stimuli responsive self-healing and malleable materials based on dynamic thiol-Michael chemistry
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DOI：
10.1039/c7py01356f
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发表时间：
2017-11-14
影响因子：
4.6
通讯作者：
Konkolewicz, Dominik
中科院分区：
文献类型：
--
作者：
Chakma, Progyateg;Possarle, Luiz Henrique Rodrigues;Konkolewicz, Dominik
硫醇-马来酰亚胺加合物已被用作动态交联剂以形成柔软、弹性和刺激响应性聚合物材料。硫醇-迈克尔加合物可以在升高的温度或升高的pH值下进行动态交换。由于硫醇-迈克尔加合物的动态行为，交联聚合物材料在切割成两半后显示出显著的愈合性，并且在暴露于pH升高的溶液时具有延展性。这些材料也具有热响应性，在高温（90摄氏度）下显示出自愈合特性和延展性。这些聚合物材料的自修复性能显著高于具有非动态交联剂的材料。此外，在机械稳定性实验中，这些材料在室温和压力下显示出抗蠕变性和完全蠕变恢复。这些结果表明，硫醇-迈克尔反应是动态的，可逆的热和pH刺激的响应。这些刺激响应性自愈、弹性、延展性和机械稳定的聚合物材料打开了在不同应用中具有潜在利用的大门，例如具有延长寿命的涂层或弹性体。
Thiol-maleimide adducts have been used as dynamic crosslinkers to form soft, elastic, and stimuli responsive polymeric materials. Thiol-Michael adducts can undergo dynamic exchange at elevated temperature or elevated pH values. Due to the dynamic behaviour of thiol-Michael adducts, crosslinked polymeric materials display significant healing after cutting into half, and malleability upon exposure to solutions of elevated pH. These materials are also thermally responsive, showing self-healing properties and malleability at high temperatures (90 degrees C). The self-healing properties of these polymer materials are significantly higher than materials with non-dynamic crosslinkers. In addition, in mechanical stability experiments, these materials showed creep resistance and complete creep recovery at room temperature and pressure. These results indicate that the thiol-Michael reaction is dynamic and reversible in response to thermal and pH stimuli. These stimuli responsive self-healing, elastic, malleable, and mechanically stable polymeric materials open the door to have potential utilization in different applications such as coatings or elastomers with extended lifetimes.