We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Aggregates of Isotactic Poly(methacrylic acid) Chains in Aqueous CsCl Solutions: a Static and Dynamic Light Scattering Study.
- Authors
Hočevar, Katarina; Sitar, Simona; Kogej, Ksenija
- Abstract
Properties of isotactic polymethacrylic acid, iPMA, chains were studied at 25°C in aqueous solutions at various CsCl concentrations, cs (= 0.05-0.20 M), in dependence on degree of neutralization of the polyion's carboxyl groups, α N, using static, SLS, and dynamic light scattering, DLS, measurements. It was demonstrated that iPMA chains with a N somewhat above the solubility limit of iPMA in aqueous solutions (in the present case at α N = 0.27) are strongly aggregated. The size of the aggregates increases with increasing cs, whereas the shape parameter, p, is approximately constant (p = 0.6), irrespective of cs. The low p value suggests that the aggregates have characteristics of microgel particles with a dense core surrounded by a less dense corona. The diffusion of iPMA chains was investigated also at higher α N, up to α N = 1. The polyion slow mode arising from electrostatic interactions between charged chains was observed for α N exceeding the value 0.27 even at the highest cs (= 0.20 M). The diffusion coefficients for the show mode were nearly independent of α N and cs at the studied polymer concentration.
- Subjects
ISOTACTIC polymers; LIGHT scattering; AQUEOUS solutions; CESIUM compounds; PARAMETER estimation
- Publication
Acta Chimica Slovenica, 2015, Vol 62, Issue 3, p546
- ISSN
1318-0207
- Publication type
Article
- DOI
10.17344/acsi.2015.1495