Ishibashi Jacob S A, Kalow Julia A
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
ACS Macro Lett. 2018 Apr 17;7(4):482-486. doi: 10.1021/acsmacrolett.8b00166. Epub 2018 Mar 30.
Current vitrimer technology uses only a handful of distinct reactions for cross-linking. New dynamic reactions can diversify vitrimer functionality and properties. In this paper, reversible cross-links formed by conjugate addition-elimination of thiols with a Meldrum's acid derivative enable compression-remolding of silicone elastomers. After 10 remolding cycles, there is no discernible deterioration of mechanical properties (Young's modulus, , rubbery plateau ), nor is there a change in stress relaxation activation energy. This robust new cross-linker could be implemented in any number of systems that currently use permanent thiol-ene cross-linking, expanding the scope of recyclable materials.
当前的 Vitrimer 技术仅使用少数几种不同的交联反应。新的动态反应可以使 Vitrimer 的功能和性能多样化。在本文中，通过硫醇与麦氏酸衍生物的共轭加成-消除形成的可逆交联能够实现硅橡胶的压缩重塑。经过 10 次重塑循环后，机械性能（杨氏模量、橡胶态平台）没有明显下降，应力松弛活化能也没有变化。这种强大的新型交联剂可以应用于目前使用永久性硫醇-烯交联的任何数量的体系中，从而扩大可回收材料的范围。
