Poly(thioether) Vitrimers via Transalkylation of Trialkylsulfonium Salts
Poly(thioether) Vitrimers via Transalkylation of Trialkylsulfonium Salts
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DOI：
10.1021/acsmacrolett.7b00494
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发表时间：
2017-09-01
影响因子：
7.015
通讯作者：
Du Prez, Filip E.
中科院分区：
文献类型：
--
作者：
Hendriks, Benjamin;Waelkens, Jelle;Du Prez, Filip E.
玻璃聚合物是永久交联的有机聚合物，可以重塑，模塑和回收，而不会损失网络完整性。本文中，我们报告了聚（硫醚）网络，通过直接的硫醇-烯光聚合反应制备，可以通过将硫醚（1-10%）部分烷基化为相应的三烷基锍盐而变成无催化剂的玻璃聚合物材料。基于经典的S（N）2型取代，所得到的聚离子网络可以在加热时通过迅速的烷基转移反应重塑。这种新的交换反应的设计的vitrimers进行了研究，无论是在低分子量的模型化合物，以及在材料水平上。此外，我们证明了这些网络的回收利用，而没有显着的机械性能损失。
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 S(N)2-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.