Insights into the Relationship between CO<sub>2</sub> Switchability and Basicity: Examples of Melamine and Its Derivatives
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Abstract
Owing
to its wide availability, nontoxicity, and low cost, CO<sub>2</sub> working as a trigger to reversibly switch material properties,
including polarity, ionic strength, hydrophilicity, viscosity, surface
charge, and degree of polymerization or cross-linking, has attracted
an increasing attention in recent years. However, a quantitative correlation
between basicity of these materials and their CO<sub>2</sub> switchability
has been less documented though it is of great importance for fabricating
switchable system. In this work, the “switch-on” and
“switch-off” abilities of melamine and its amino-substituted
derivatives by introducing and removing CO<sub>2</sub> are studied,
and then their quantitative relationship with basicity is established,
so that performances of other organobases can be quantitatively predicted.
These findings are beneficial for forecasting the CO<sub>2</sub> stimuli-responsive
behavior of other organobases and the design of CO<sub>2</sub>-switchable
materials