Phosphonic acid polymer ion gels with controlled intermolecular interactions
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초록
내용
Ion gels have unique advantages of high ionic conductivity and low volatility. By controlling the type of ionic liquids and varying the chemical structure of polymer matrices, ion gels properties could be largely modulated. In the present study, we investigated the ion gels based on phosphonic acid polymers and ionic liquids by focusing on the chain structures, mechanical properties, and ion transport properties. The different chain structures were determined for the neat phosphonic acid polymers, depending on the position of tethered acid group, attributed to the dissimilar rotational freedom and steric hindrance of acid functional group. By introducing various ionic liquids into the phosphonic acid polymers, the resultant ion gels showed either prevailing hydrogen bonding interactions or coexisting coulomb and hydrogen bonding interactions. This was connected to tunable ion transport properties, toughness, elasticity, and self-healing properties in a wide range, allowing the development of tailor-made ion gels based on intermolecular interactions.