Chemical control of the viscoelastic properties of vinylogous urethane vitrimers.,Nature Communications

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Chemical control of the viscoelastic properties of vinylogous urethane vitrimers.
Nature Communications ( IF 14.7 ) Pub Date : 2017-03-20 , DOI: 10.1038/ncomms14857
Wim Denissen ₁ , Martijn Droesbeke ₁ , Renaud Nicolaÿ ₂ , Ludwik Leibler ₂ , Johan M Winne ₁ , Filip E Du Prez ₁

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Vinylogous urethane based vitrimers are polymer networks that have the intrinsic property to undergo network rearrangements, stress relaxation and viscoelastic flow, mediated by rapid addition/elimination reactions of free chain end amines. Here we show that the covalent exchange kinetics significantly can be influenced by combination with various simple additives. As anticipated, the exchange reactions on network level can be further accelerated using either Brønsted or Lewis acid additives. Remarkably, however, a strong inhibitory effect is observed when a base is added to the polymer matrix. These effects have been mechanistically rationalized, guided by low-molecular weight kinetic model experiments. Thus, vitrimer elastomer materials can be rationally designed to display a wide range of viscoelastic properties.

中文翻译：

插烯聚氨酯玻璃体粘弹性的化学控制。

基于乙烯基氨基甲酸酯的vitrimers是聚合物网络，其具有通过自由链端胺的快速加成/消除反应介导的网络重排、应力松弛和粘弹性流动的固有特性。在这里，我们表明，与各种简单添加剂的组合可以显着影响共价交换动力学。正如预期的那样，使用布朗斯特酸或路易斯酸添加剂可以进一步加速网络水平的交换反应。然而，值得注意的是，当向聚合物基质中添加碱时，观察到强烈的抑制作用。在低分子量动力学模型实验的指导下，这些效应已在机械上合理化。因此，vitrimer弹性体材料可以通过合理设计来表现出广泛的粘弹性能。

更新日期：2017-03-21

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