In Situ Synthesis of Imidazolium-Crosslinked Ionogels via Debus–Radziszewski Reaction Based on PAMAM Dendrimers in Imidazolium Ionic liquid
writer：Xiaomeng Zhao, Shufei Guo, Hao Li, Jiahang Liu, Xinxin Liu, and Hongzan Song
keywords：ionic conductivity, ionogels, Debus–Radziszewski reaction, dendrimers, viscoelasticity
source：期刊
specific source：Macromol. Rapid Commun.
Issue time：2017年
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?1) is achieved, and more remarkably, it
can still exceed 1 mS cm?1 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 106 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.