Hendriks Benjamin, Waelkens Jelle, Winne Johan M, Du Prez Filip E
Department of Organic and Macromolecular Chemistry, Polymer Chemistry Research Group and Laboratory of Organic Synthesis, Ghent University, Krijgslaan, 281, S4-bis, B-9000 Ghent, Belgium.
ACS Macro Lett. 2017 Sep 19;6(9):930-934. doi: 10.1021/acsmacrolett.7b00494. Epub 2017 Aug 15.
Vitrimers are permanently cross-linked organic polymers that can be reshaped, molded, and recycled without loss of network integrity. Herein, we report poly(thioether) networks, prepared through a straightforward thiol-ene photopolymerization, that can be turned into catalyst-free vitrimer materials by partial alkylation of the thioethers (1-10%) to the corresponding trialkylsulfonium salts. Based on a classical S2-type substitution, the resulting polyionic networks can be reshaped upon heating via swift transalkylation reactions. This novel exchange reaction for the design of vitrimers was studied both on low MW model compounds as well as on a material level. In addition, we demonstrated the recycling of these networks without significant loss of mechanical properties.
玻璃态弹性体是永久交联的有机聚合物，能够在不损失网络完整性的情况下进行重塑、模塑和回收利用。在此，我们报道了通过简单的硫醇-烯光聚合制备的聚（硫醚）网络，通过将硫醚（1-10%）部分烷基化生成相应的三烷基硫鎓盐，可将其转变为无催化剂的玻璃态弹性体材料。基于经典的S2型取代反应，所得的聚离子网络在加热时可通过快速的烷基转移反应进行重塑。这种用于设计玻璃态弹性体的新型交换反应在低分子量模型化合物以及材料层面上均进行了研究。此外，我们还展示了这些网络的回收利用，且机械性能没有显著损失。
