Self-Diffusion of Star and Linear Polyelectrolytes in Salt-Free and Salt Solutions.

ABSTRACT: This work explored solution properties of linear and star poly(methacrylic acids) with four, six, and eight arms (LPMAA, 4PMAA, PMAA, and 8PMAA, respectively) of matched molecular weights in a wide range of pH, salt, and polymer concentrations. Experimental measurements of self-diffusion were performed by fluorescence correlation spectroscopy (FCS), and the results were interpreted using the scaling theory of polyelectrolyte solutions. While all PMAAs were pH sensitive and showed an increase in hydrodynamic radius (R _h) with pH in the dilute regime, the R _h of star polymers (measured at basic pH values) was significantly smaller for the star polyacids due to their more compact structure. Fully ionized star PMAAs were also found to be less sensitiv

SUBMITTER: Aliakseyeu A 

PROVIDER: S-EPMC11741142 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature