Metal-Catalyzed Transesterification for Healing and Assembling of Thermosets
Metal-Catalyzed Transesterification for Healing and Assembling of Thermosets
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DOI：
10.1021/ja302894k
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发表时间：
2012-05-09
影响因子：
15
通讯作者：
Leibler, Ludwik
中科院分区：
文献类型：
--
作者：
Capelot, Mathieu;Montarnal, Damien;Leibler, Ludwik
键交换反应的催化控制能够在多种条件下修复交联聚合物材料。在酯交换催化剂存在下，环氧酸和环氧酸酐热固性网络在高温下具有修复能力。在较低温度下，交换反应非常缓慢，并且该材料具有经典环氧热固性材料的性能。对模型分子的研究证实，愈合动力学是由酯交换反应速率控制的。改变催化剂浓度的可能性带来了环氧热固性材料焊接和组装的控制和灵活性，这是热塑性塑料所不存在的。
Catalytic control of bond exchange reactions enables healing of cross-linked polymer materials under a wide range of conditions. The healing capability at high temperatures is demonstrated for epoxy-acid and epoxy anhydride thermoset networks in the presence of transesterification catalysts. At lower temperatures, the exchange reactions are very sluggish, and the materials have properties of classical epoxy thermosets. Studies of model molecules confirmed that the healing kinetics is controlled by the transesterification reaction rate. The possibility of varying the catalyst concentration brings control and flexibility of welding and assembling of epoxy thermosets that do not exist for thermoplastics.