Abstract
Double‐hydrophilic block copolymers (DHBCs) of poly((4‐diethylamino)‐(E)‐stilbene)‐alt‐maleic acid)‐block‐acryloyl morpholine (DEASti‐alt‐MA)‐b‐ACMO), semirigid‐b‐flexible coil structures, form polyion complexes (PICs) in aqueous solutions. The pH and salt responsiveness of the PICs are studied using dynamic light scattering (DLS). PIC complex formation is dependent on block segment lengths and pH. The particle size increases as the pH approaches the IEP (isoelectric point) of the DHBC. The salt responsiveness is also measured by using DLS to monitor PIC size for four examples with different segment molar masses. These PICs exhibit an antipolyelectrolyte effect with increasing hydrodynamic diameter as ionic strength (NaCl) increases from 0.01 to 2.0 m. PICs are more stable at higher ionic strengths with higher ACMO molar mass. image
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