Serie inversa de Hofmeister en la interacción de un poliuretano catiomérico y diversos aniones monovalentes

  1. Borja Fernández-d'Arlas 1
  2. Alejandro J. Müller 2
  1. 1 Universidad Pública de Navarra
    info

    Universidad Pública de Navarra

    Pamplona, España

    ROR https://ror.org/02z0cah89

  2. 2 Universidad del País Vasco, Facultad de Ciencias Químicas
Journal:
Revista Iberoamericana de Polímeros

ISSN: 0121-6651,  1988-4206

Year of publication: 2017

Volume: 18

Issue: 1

Pages: 9-20

Type: Article

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More publications in: Revista Iberoamericana de Polímeros

Abstract

This work presents the effects of the presence of different alkyl–halides (NaF, NaCl, NaBr, NaI) on the aqueous solutions of a catiomeric polyurethane. The salting–out tendency of the polyurethane when mixing it with a saline solution follows an inverse Hofmeister serie (ClO4 –> SCN– ≈ HCO3 – > I–> H2PO4–> NO3–> Br–> Cl–> F-) This observation can be explained by the model of Matching Water Affinities (AAE) which predicts that the caotrope alkyl ammonium of the polyurethane would interact favorably with caotropic anions (i.e., iodide, I– ) than with cosmotropic anions (i.e., fluoride, F–). The observed precipitation of the polyurethane in the presence of caotropic anions would be explained by the partial loss of polyurethane charges.

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