Freiburg Center for Interactive Materials and Bioinspired Technologies , University of Freiburg , Georges-Köhler-Allee 105 , Freiburg 79110 , Germany.
DWI-Leibniz-Institute for Interactive Materials , Forckenbeckstrasse 50 , Aachen 52056 , Germany.
ACS Appl Mater Interfaces. 2018 Jun 20;10(24):20250-20255. doi: 10.1021/acsami.8b06359. Epub 2018 Jun 6.
The development of on-demand cross-linking strategies is a key aspect in promoting mechanical properties of high-performance bioinspired nanocomposites. Here, we embed styrene sulfonyl azide groups with latent chemical reactivity into water-soluble copolymers and assemble those with high-aspect-ratio synthetic nanoclays to generate well-defined layered polymer/nanoclay nacre-mimetics. A considerable stiffening and strengthening occurs upon activation of the covalent cross-linking using simple heating. Varying the amount of cross-linkable units allows molecular control of mechanical properties from ductile to stiff and strong. Moreover, the covalent cross-linking enhances the moisture stability of water-borne nacre-mimetics. The strategy is facile and versatile allowing for a transfer into applications.
按需交联策略的发展是提高高性能仿生纳米复合材料机械性能的关键方面。在这里，我们将具有潜在化学反应性的苯乙烯磺酰叠氮基团嵌入水溶性共聚物中，并将其与高纵横比的合成纳米粘土组装在一起，生成具有明确层状结构的聚合物/纳米粘土珍珠层模拟物。通过简单加热激活共价交联，可以显著增强其刚度和强度。通过改变可交联单元的数量，可以实现从韧性到刚性和高强度的力学性能的分子控制。此外，共价交联增强了水基珍珠层模拟物的耐湿性。该策略简便通用，可应用于多种领域。
