Abstract
A series of zwitterionic polyelectrolytes poly[3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate] (PMAPS) with a wide range of weight-average molecular weight (Mw) between 5.5 × 103 and 1.6 × 106 g mol–1 with narrow molecular weight distribution (Mw/Mn = 1.07–1.19) were thoroughly characterized in aqueous NaCl solutions for salt concentration (Cs) over a range from theta Cs (0.074 M) to 1.0 M by synchrotron radiation small-angle X-ray scattering (SAXS), light scattering, and viscometry at 25 °C. To determine the chain stiffness parameter (λ–1) and the excluded-volume strength (B) of PMAPS in an aqueous NaCl solution, SAXS profiles and the Mw dependences of the radius of gyration, the second virial coefficient, the interpenetration function, the hydrodynamic radius, and the intrinsic viscosity for PMAPS were analyzed on the basis of the (un)perturbed cylindrical wormlike chain model. The experimental λ–1 value for PMAPS chains in aqueous NaCl solutions barely decreased but was almost consta...
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