Influence of the linear aromatic density on methylene blue aggregation around polyanions containing sulfonate groups

Ignacio Moreno-Villoslada, César Torres-Gallegos, Rodrigo Araya-Hermosilla, Hiroyuki Nishide

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

The aggregation of methylene blue around different polyelectrolytes is studied by diafiltration, UV-vis, and 1H NMR spectroscopies. Poly(sodium acrylate-co-sodium maléate) induces the formation of higher-order aggregates, showing a typical polyelectrolyte behavior dominated by long-range electrostatic interactions with the dye which are highly dependent on the ionic strength. Poly(sodium 4-styrenesulfonate) presents a high dispersant ability of methylene blue, showing what we can call a typical polyaromatic-anion behavior characterized by the presence of short-range aromatic-aromatic interactions with the dye which are less dependent on the ionic strength. An intermediate behavior is found for the copolymers poly(sodium 4-styrenesulfonate-co-sodium maleate) at two different comonomer compositions, related to a different probability of the polymers to form and stabilize ion pairs in hydrophobic environments. Their behavior is a function of the linear aromatic density, which is related to the comonomeric structure.

Original languageEnglish
Pages (from-to)4151-4158
Number of pages8
JournalJournal of Physical Chemistry B
Volume114
Issue number12
DOIs
Publication statusPublished - 2010 Apr 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

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