Chemorheology of phenylboronate-salicylhydroxamate cross-linked hydrogel networks with a sulfonated polymer backbone

Meredith C. Roberts, Alamelu Mahalingam, Melissa C. Hanson, Patrick F. Kiser

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Hydrogel networks cross-linked with polymer-bound phenylboronic acid (PBA) and salicylhydroxamic acid (SHA) demonstrate pH-reversible gel behavior due to the pH-dependent equilibrium of the crosslinking moieties that form the gel network. Furthermore, the pH at which gels behave dynamically can be controlled by use of a polyelectrolyte backbone. Here we report on the frequency-dependent chemorheological characterization of PBA-SHA cross-linked hydrogel networks with a sulfonated polymer backbone. Our results suggest that the anionic nature of the polymers allows reversible cross-linking at neutral pH that an otherwise neutral-backboned PBA-SHA cross-linked network cannot and that these charge-induced dynamics can be effectively screened by ions in solution. Moreover, moduli-frequency data can effectively be reduced into a single master curve with a neutral-backboned PBA-SHA gel data set as the reference condition.

Original languageEnglish (US)
Pages (from-to)8832-8840
Number of pages9
JournalMacromolecules
Volume41
Issue number22
DOIs
StatePublished - Nov 25 2008

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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