Abstract
The properties of aqueous solutions of polyelectrolytes of sodium o- and p-methacryloylaminophenylarsonate (o- and p- MAPHA-Na) with acrylamide (AAD) or sodium methacrylate (MA-Na): poly(sodium o-methacryloylaminophenylarsonate) (poly(o-MAPHA-Na)), poly(sodium o-methacryloylaminophenylarsonate-co-acrylamide) (poly(o-MAPHA-Na-co-AAD)) (26:74), poly(sodium o-methacryloylaminophenylarsonate-co-sodium methacrylate) (poly(o- MAPHA-Na-co-AM-Na) (35:65) and (14:86), and poly(sodium p-methacryloylaminophenylarsonate-co-sodium methacrylate) (poly(p- MAPHA-Na-co-AM-Na)) (34:66) were studied by off-line, multi-angle light scattering, and in-line using size exclusion chromatography coupled with multi-angle light scattering (SEC-MALS) and refractometric (RI) detection. The Mw value corresponding to the homopolymer poly(o-MAPHA-Na) was 1,300,000 g/mol and for the copolymers the Mw and gyration radius values were decreased when the AAD or AM-Na comonomer composition increased. The macromolecular parameters obtained using SEC-MALS were in agreement with the values measured in the off-line mode. Also, SEC-MALS experiments allowed examination of the radius of gyration-Mw relationship in order to determine the polyelectrolyte conformation (ρ) in solution; these values fell between 0.7-0.53, indicating that the polyelectrolytes are random coils at θ-conditions. In addition, the effect of the pH on the macromolecular parameters was evaluated. At pH 4.5, the Mw and gyration radius values corresponding to poly(o-MAPHA-Na) and poly(o-MAPHA-Na-co-AAD) (26/74) remained very close to those measured at pH 7. However, <r g 2 > values for poly(o-MAPHA-Na-co-AM-Na) copolymers at pH 4.5 were less than pH 7, indicating that the presence of AM-Na reduced the size of the copolymer through intermolecular interactions.
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We thank CONACYT (projects 183833 and 157552), PROMEP-SEP (Thematic network of collaboration), and VIEP-BUAP for supporting the research. Also, we thank Dr. Aym Berges from Wyatt.
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Soriano-Moro, G., Percino, J., Cerón, M. et al. Physicochemical study by multi-angle light scattering of water-soluble methacryloylaminophenylarsonate copolymers. J Polym Res 21, 492 (2014). https://doi.org/10.1007/s10965-014-0492-6
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DOI: https://doi.org/10.1007/s10965-014-0492-6