College of Chemistry & Environmental Science, Hebei University, Baoding, Hebei Province, 071002, P. R. China.
Macromol Rapid Commun. 2017 Nov;38(21). doi: 10.1002/marc.201700415. Epub 2017 Sep 12.
This study reports a remarkably facile method to synthesize novel ionogels with imidazolium cycle crosslinks based on polyamidoamine (PAMAM) dendrimers via one-pot, modified Debus-Radziszewski reaction in ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]). High room temperature ionic conductivity (up to 6.8 mS cm ) is achieved, and more remarkably, it can still exceed 1 mS cm when the dendrimer content reached 70% because PAMAM dendrimers are completely amorphous with many cavities and the newly formed imidazolium crosslinks contains ions. The elastic modulus of these ionogels can exceed 10 Pa due to the newly-formed rigid imidazolium crosslinks. Crucially, these ionogels are robust gels even at temperatures up to 160 °C. Such novel ionogels with high ionic conductivity, tunable modulus, and flexibility are desirable for use in high-temperature flexible electrochemical devices.
本研究报告了一种简便的方法，通过一锅法、在离子液体 1-乙基-3-甲基咪唑醋酸盐 ([EMIM][OAc]) 中，用改良的 Debus-Radziszewski 反应，以聚酰胺-胺（PAMAM）树状大分子为基础，合成新型的基于咪唑环交联的离子凝胶。室温下离子电导率高达 6.8 mS cm ，更显著的是，当树状大分子含量达到 70%时，仍能超过 1 mS cm ，因为 PAMAM 树状大分子完全无定形，具有许多空腔，新形成的咪唑交联含有离子。由于新形成的刚性咪唑交联，这些离子凝胶的弹性模量可超过 10 Pa。至关重要的是，即使在高达 160°C 的温度下，这些离子凝胶也是坚固的凝胶。这种具有高离子电导率、可调模量和柔韧性的新型离子凝胶，非常适合用于高温柔性电化学器件。
