Synthesis and properties of mono- and di-sulfonic acid polymers with precisely controlled substitutional positions
발표자
진상윤 (포항공과대학교)
연구책임자
박문정 (포항공과대학교)
공동저자
진상윤 (포항공과대학교), 박문정 (포항공과대학교)
초록
내용
Sulfonated polystyrenes have attracted significant attention as polymer electrolytes due to their high proton conductivity. However, conventional post-sulfonation methods lead to uncertainties in acid-group concentration and substitution positions, limiting fundamental understanding of proton transport. In this study, we synthesized mono- and di-sulfonic acid polymers via controlled polymerization of monomers with precisely defined number and substitution positions of sulfonic acid groups. In di-sulfonic polymers, the spatial proximity of sulfonic acid groups induces intramolecular hydrogen bonding, thereby impacting acidity. Notably, meta- and para- disulfonic acid polystyrenes exhibited hydrophobic characteristics due to intramonomeric hydrogen-bonding interactions. Upon incorporation of ionic liquids, electrostatic interactions strongly depended on position of acid-groups, resulting in distinct ion-clustering behaviors and variation in proton conductivity and mechanical properties.